35 results on '"Menezes, Rômulo S. C."'
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2. Monitoring Desertification Using a Small Set of Biophysical Indicators in the Brazilian Semiarid Region
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Perez-Marin, Aldrin Martin, primary, Vendruscolo, Jhony, additional, Zárate-Salazar, Jhonatan Rafael, additional, De Araújo Queiroz, Heithor Alexandre, additional, Magalhães, Daniel Lima, additional, Menezes, Rômulo S. C., additional, and Fernandes, Izaias Médice, additional
- Published
- 2022
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3. Root and shoot biomasses in the tropical dry forest of semi-arid Northeast Brazil
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Costa, Tânia L., Sampaio, Everardo V.S.B., Sales, Margareth F., Accioly, Luciano J. O., Althoff, Tiago D., Pareyn, Frans G. C., Albuquerque, Eliza R. G. M., and Menezes, Rômulo S. C.
- Published
- 2014
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4. Interannual Variability of Energy and CO 2 Exchanges in a Remnant Area of the Caatinga Biome under Extreme Rainfall Conditions.
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Mendes, Keila R., Marques, Ana M. S., Mutti, Pedro R., Oliveira, Pablo E. S., Rodrigues, Daniele T., Costa, Gabriel B., Ferreira, Rosaria R., Silva, Any C. N. da, Morais, Leonardo F., Lima, José Romualdo S., Antonino, Antonio C. D., Menezes, Rômulo S. C., Silva, Cláudio M. Santos e, and Bezerra, Bergson G.
- Abstract
Research focusing on energy, water vapor, and CO
2 exchanges over the Caatinga Biome is recent. Consequently, there exist research gaps on this topic that limit our ability to understand and project interannual and long-term variations in the CO2 cycle of this environment. Thus, the objective of this study was to evaluate the behavior of the energy and CO2 balances of the Caatinga Biome under extreme rainfall conditions (extreme drought and intense rainfall) using simulations of the SITE model (Simple Tropical Ecosystem Model). Meteorological data from the years 2009 (heavy rainfall) and 2012 (extreme drought) obtained from an INMET automatic station were used. Relationships between monthly GPP and NEE values and rainfall were also analyzed. Although the SITE model had been previously calibrated for the region, adjustments to the calibration were necessary for our study due to the extreme climatic values of the selected years. The results highlight the impact of rainfall on energy and mass exchanges over the Caatinga, particularly evident in the partitioning of the energy balance and the CO2 balance. In 2009 (during heavy rainfall), the fraction of Rn converted into LE was nearly 6% higher compared to the values observed in 2012 (during extreme drought). Regarding CO2 , it was found that the Caatinga behaved as a sink, even under extreme drought conditions (2012), with annual average values of −1.86 µmol m−2 s−1 (2009) and −0.81 µmol m−2 s−1 (2012). Relationships between monthly GPP and NEE values and rainfall were also investigated, revealing an asymptotic relationship between the components of CO2 balance and rainfall. It was evident that both the monthly values of GPP and NEE tend to stabilize when monthly rainfall volumes exceed 200 mm. [ABSTRACT FROM AUTHOR]- Published
- 2023
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5. Carbon and nutrient fluxes through litterfall at four succession stages of Caatinga dry forest in Northeastern Brazil
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Moura, Patrícia M., Althoff, Tiago D., Oliveira, Renann A., Souto, Jacob S., Souto, Patrícia C., Menezes, Rômulo S. C., and Sampaio, Everardo V. S. B.
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- 2016
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6. Caatinga, the Brazilian dry tropical forest: can it tolerate climate changes?
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Santos, Mauro G., Oliveira, Marciel T., Figueiredo, Karla V., Falcão, Hiram M., Arruda, Emília C. P., Almeida-Cortez, Jarcilene, Sampaio, Everardo V. S. B., Ometto, Jean P. H. B., Menezes, Rômulo S. C., Oliveira, Antônio F. M., Pompelli, Marcelo F., and Antonino, Antônio C. D.
- Published
- 2014
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7. Assessment of SITE for CO2 and Energy Fluxes Simulations in a Seasonally Dry Tropical Forest (Caatinga Ecosystem)
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Mendes, Keila R., primary, Campos, Suany, additional, Mutti, Pedro R., additional, Ferreira, Rosaria R., additional, Ramos, Tarsila M., additional, Marques, Thiago V., additional, dos Reis, Jean S., additional, de Lima Vieira, Mariana M., additional, Silva, Any Caroline N., additional, Marques, Ana Maria S., additional, da Silva, Duany T. C., additional, da Silva, Daniel F., additional, Oliveira, Cristiano P., additional, Gonçalves, Weber A., additional, Costa, Gabriel B., additional, Pompelli, Marcelo F., additional, Marenco, Ricardo A., additional, Antonino, Antonio C. D., additional, Menezes, Rômulo S. C., additional, Bezerra, Bergson G., additional, and Santos e Silva, Cláudio M., additional
- Published
- 2021
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8. Croton blanchetianus modulates its morphophysiological responses to tolerate drought in a tropical dry forest
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Mendes, Keila R., primary, Granja, João A. A., additional, Ometto, Jean P., additional, Antonino, Antônio C. D., additional, Menezes, Rômulo S. C., additional, Pereira, Eugênia C., additional, and Pompelli, Marcelo F., additional
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- 2017
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9. Characterisation of soil organic matter in a semi-arid fluvic Entisol fertilised with cattle manure and/or gliricidia by spectroscopic methods
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Primo, Dário C., primary, Menezes, Rômulo S. C., additional, Silva, Wilson T. L., additional, Oliveira, Fabio F., additional, Júnior, José C. B. D., additional, and Sampaio, Everardo V. S. B., additional
- Published
- 2017
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10. Produtividade de biomassa em sistemas agroflorestais e tradicionais no Cariri Paraibano
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Martins, Júlio C. R., Menezes, Rômulo S. C., Sampaio, Everardo V. S. B., Santos, Ailton F. dos, and Nagai, Mona A.
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semiarid ,agroecosystems ,agroecosisstemas ,semiárido ,Manihot glaziovii ,Gliricidia sepium - Abstract
As produtividades de biomassa de sistemas tradicionais (cultivos de milho e feijão, capim buffel ou palma) e agroflorestais (cultivos entre fileiras de gliricídia ou maniçoba) foram comparadas em experimento em parcelas subdivididas, de 2006 a 2009, em Taperoá, Paraíba. A precipitação média é de 600 mm. Nas parcelas agroflorestais as fileiras de árvores distavam 6 m, com 1 m entre árvores. No sistema tradicional, os cultivos produziram 33% mais biomassa e a biomassa de milho e feijão foi o dobro da produzida nos sistemas agroflorestais. O capim buffel foi o cultivo que mais produziu no sistema agroflorestal. No sistema tradicional os cultivos que mais produziram foram buffel e consórcio milho e feijão. A gliricídia produziu nove vezes mais biomassa de folhas, galhos finos e lenha que a maniçoba. Incluindo essas biomassas, a produtividade total nos sistemas agroflorestais foi 260% maior que nos sistemas tradicionais. Os coeficientes de variação da produtividade anual de biomassa foram menores nos sistemas agroflorestais. Portanto, a presença de árvores não só aumentou a produtividade total como conferiu maior estabilidade aos sistemas. The biomass productivity of traditional systems (corn and beans, buffel grass and prickly pear cactus) and agroforestry systems (crops betwenn lines of gliricídia or maniçoba) were compared in a split plot experiment, during 2006 to 2009, in Taperoá, Paraíba, Brazil. Mean annual rainfall in the region is 600 mm. The agroforestry alleys were 6 m apart with 1 m between trees. In the traditional systems, the crops produced 33% more biomass and the corn and beans double the biomass of the agroforestry systems. Buffel grass was the most productive crop in the agroforestry systems. In the traditional systems, buffel and intercrops corn and beans were the most productive crops. Gliricidia produced nine times more leaf, twig and fuel wood biomass than maniçoba. Including these biomasses the productivity of the agroforestry systems was 260% higher than that of the traditional systems. The coefficient of variation of the annual biomass productivity was lower for the agroforestry systems. Therefore, the presence of trees increases not only the productivity but also the stability of the systems.
- Published
- 2013
11. Produtividade de biomassa em sistemas agroflorestais e tradicionais no Cariri Paraibano
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Martins,Júlio C. R., Menezes,Rômulo S. C., Sampaio,Everardo V. S. B., Santos,Ailton F. dos, and Nagai,Mona A.
- Subjects
agroecosisstemas ,semiárido ,Manihot glaziovii ,Gliricidia sepium - Abstract
As produtividades de biomassa de sistemas tradicionais (cultivos de milho e feijão, capim buffel ou palma) e agroflorestais (cultivos entre fileiras de gliricídia ou maniçoba) foram comparadas em experimento em parcelas subdivididas, de 2006 a 2009, em Taperoá, Paraíba. A precipitação média é de 600 mm. Nas parcelas agroflorestais as fileiras de árvores distavam 6 m, com 1 m entre árvores. No sistema tradicional, os cultivos produziram 33% mais biomassa e a biomassa de milho e feijão foi o dobro da produzida nos sistemas agroflorestais. O capim buffel foi o cultivo que mais produziu no sistema agroflorestal. No sistema tradicional os cultivos que mais produziram foram buffel e consórcio milho e feijão. A gliricídia produziu nove vezes mais biomassa de folhas, galhos finos e lenha que a maniçoba. Incluindo essas biomassas, a produtividade total nos sistemas agroflorestais foi 260% maior que nos sistemas tradicionais. Os coeficientes de variação da produtividade anual de biomassa foram menores nos sistemas agroflorestais. Portanto, a presença de árvores não só aumentou a produtividade total como conferiu maior estabilidade aos sistemas.
- Published
- 2013
12. Biomassa e nutrição mineral de forrageiras cultivadas em solos do semiárido adubados com esterco
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Araújo, Eduardo R., Silva, Tácio O. da, Menezes, Rômulo S. C., Fraga, Vânia da S., and Sampaio, Everardo V. de S. B.
- Subjects
organic manure ,adubação orgânica ,potassium ,legumes ,fósforo ,potássio ,phosphorus ,leguminosas ,nitrogen ,nitrogênio - Abstract
A produção de biomassa e as absorções de N, P e K de quatro espécies forrageiras foram comparadas em três solos representativos da região semi-árida da Paraíba, cultivadas sem e com adubação orgânica. As espécies foram jureminha (Desmanthus virgatus), orelha-de-onça (Macroptilium martii), feijão-de-rolinha (Macroptilium lathyroides) e capim buffel (Cenchrus ciliaris); os solos foram Neossolo Flúvico, Neossolo Regolítico e Planossolo Háplico e a adubação foi realizada com esterco bovino (20 Mg ha-1) comparado com a testemunha. A adubação com esterco promoveu grandes incrementos na produção de biomassa e nas acumulações dos nutrientes, em todas as plantas e solos. O esterco parece ter suprido P às plantas em quantidades suficientes mas não de N e K, confirmando que é uma boa fonte do primeiro elemento. O feijão de rolinha e a orelha de onça tiveram as maiores capacidades de acumulação de biomassa, principalmente em resposta à adubação. O capim buffel atinge maiores teores e conteúdos de K na matéria seca que as leguminosas. Não houve correspondência entre a análise dos solos e sua capacidade de suprimento de nutrientes. Biomass production and N, P and K uptake by four forage species were compared in three soils from the semi-arid region of Paraíba, with or without organic manure. The species were three legumes (Desmanthus virgatus , Macroptilium martii and Macroptilium lathyroides) and one grass (Cenchrus ciliaris); the soils, a Fluvic Neosol, a Regolithic Neosol and Haplic Planosol; and cattle manure was applied at a dose equivalent to 20 Mg ha-1. Manure application resulted in large increases in biomass production and nutrient uptake, in all species and soils. Apparently, the manure supplied enough P but not enough N and K to the plants, confirming that it is a good source of the first nutrient. Macroptilium martii and Macroptilium lathyroides seem to be the highest biomass producers, mainly in response to fertilization. Cenchrus ciliaris had higher K concentrations and contents than the legumes, indicating a larger K absorption capacity. There was no correspondence between soil analysis and nutrient supplying capacity.
- Published
- 2011
13. Residual effect of organic fertilization on maize yield in an agroforestry system
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Santos,Ailton F. dos, Menezes,Rômulo S. C., Fraga,Vânia S., and Pérez-Marin,Aldrin M.
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alley cropping ,esterco ,região semiárida ,animal manure ,gliricídia ,semi-arid region ,aléias ,gliricidia - Abstract
O objetivo deste trabalho foi estudar, ao longo de dois anos, o efeito residual da adubação orgânica com esterco ou biomassa de gliricídia sobre os nutrientes do solo e sobre a produtividade e acúmulo de nutrientes pelo milho cultivado isolado (SA) ou consorciado em aléias de gliricídia (CA). O trabalho foi desenvolvido em Esperança, PB instalado em parcelas subdivididas, arranjadas em blocos casualizados, em que os sistemas (CA) e (SA) corresponderam aos tratamentos principais e os tratamentos de adubação com esterco, gliricídia e as parcelas-controle, aos tratamentos secundários, com quatro repetições. A adubação com esterco demonstrou maior efeito residual sobre a produtividade do milho nas parcelas do tratamento SA. No sistema CA o efeito residual foi reduzido, provavelmente pela competição por água e nutrientes entre o milho e gliricídia, indicando maior necessidade de adubação neste tipo de sistema. Os teores de P, K, Ca e Mg do solo em ambos os sistemas e ao longo dos dois anos do estudo foram mais elevados nas parcelas adubadas com esterco. The objective of the present study was to evaluate, during a period of two years, the residual effects of organic fertilization with animal manure or gliridicia prunings on the fertility of soil and on productivity and nutrient accumulation by maize cultivated either isolated (SA) or intercropped within alleys of gliricidia (CA). The study was conducted during 2006 and 2007 in the Centro Agroecológico São Miguel, headquarters of the NGO AS-PTA, in Esperança, PB, Brazil. The experiment was established in a split-plot design, arranged in randomized blocks, with the type of cropping system (SA or CA) as the main treatments and the organic fertilization (animal manure, gliricidia prunings or control plots) as the secondary treatments, with four replications. The organic fertilization with animal manure led to a residual effect increasing maize productivity during the two years, but the fertilization with gliricidia prunings had no residual effect. The residual effect on maize productivity was more pronounced in the SA plots, compared to the plots with gliricidia alleys (CA). Probably, the lower residual effect within the CA system was due to the competition between maize and gliricidia for resources (nutrients, water and light), which indicates the need for higher rates or more frequent fertilizer applications in these systems. The contents of P, K, Ca and Mg in the soil was higher in the plots that received animal manure within both types of cropping systems.
- Published
- 2010
14. Growth and uptake of nutrients by cotton and castor bean fertilized with gliricidia and/or manure
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Garrido,Marlon da S., Menezes,Rômulo S. C., Sampaio,Everardo V. S. B., and Marques,Tereza R. R.
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adubação orgânica ,green manure ,organic fertilization ,Gossypium hirsutum ,Ricinus communis ,adubo verde - Abstract
As quantidades de esterco disponíveis nas propriedades não são suficientes para adubar as áreas agrícolas na região semiárida do Brasil. Além disso, o esterco apresenta, em geral, baixa qualidade e pode causar imobilização de nitrogênio do solo. Sendo assim, os adubos verdes, como as ramas de gliricídia ou a sua mistura com esterco, podem ser boa alternativa para aumentar a disponibilidade e a qualidade de adubos orgânicos. O crescimento inicial e a absorção de nutrientes pelo algodoeiro e pela mamoneira, adubados com esterco e/ou gliricídia, foram medidos em dois cultivos consecutivos, em casa de vegetação, utilizando-se os tratamentos: testemunha; incorporação de 20 t ha-1 de esterco; incorporação de 20 t ha-1 de folhas de gliricídia; e incorporação da mistura de 10 t ha-1 de esterco e de 10 t ha-1 de gliricídia. O tratamento com a incorporação de gliricídia apresentou maior crescimento das plantas de algodão e de mamona, tal como a maior e mais rápida disponibilização de N mineral e o maior acúmulo de nutrientes, com recuperações aparentes de N, P e K, significativamente superiores às dos demais tratamentos. O esterco não aumentou a disponibilidade de N no solo, mas sua mistura com a gliricídia aumentou a disponibilidade de N, P e K do solo em relação à testemunha, tratando-se de prática promissora capaz de melhorar a qualidade do esterco. The amount of manure available on farms in the semiarid region of Northeastern Brazil is usually insufficient to fertilize the cultivated areas. Besides this, in most cases the manure available is of low quality and may immobilize soil nitrogen. For these reasons, the use of green manures, such as gliricidia prunings, or the mixture of these with animal manures, may be a good alternative to increase the availability and quality of organic fertilizers. The initial growth and uptake of nutrient by cotton and castor bean fertilized with manure and/or gliricidia were measured in two consecutive growing periods in the greenhouse. The treatments were: incorporation 20 t ha-1 of manure; incorporation of 20 t ha-1 of gliricidia prunings; incorporation of the mixture of 10 t ha-1 of manure and 10 t ha-1 of gliricidia; and a control without fertilization. The treatment with gliricídia incorporation resulted in better development of both crops, greater soil N availability, greater accumulation of nutrients in the dry biomass of the crops, and greater apparent recovery of N, P and K, relative to the other treatments. The manure did not increase soil N availability, but the mixture of manure and gliricidia increased availability of soil N, P and K in relation to the control treatment, proving to be a promising practice capable of improving the quality of animal manure.
- Published
- 2009
15. Mudanças na fertilidade de um Neossolo Regolítico após seis anos de adubação orgânica
- Author
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Menezes, Rômulo S. C. and Silva, Tácio O. da
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esterco ,semi-arid region of NE Brazil ,Crotalaria juncea L ,green manure ,manure ,micronutrients ,região semi-árida ,micronutrientes ,adubação verde - Abstract
Visou-se, com o presente estudo, avaliar os efeitos de seis anos de adubação orgânica sobre as características químicas de um Neossolo Regolítico cultivado com batata. Os tratamentos de adubação orgânica foram: 1) esterco (15 t ha-1); 2) cultivo e incorporação da Crotalaria juncea L.; 3) combinação de metade da dose de esterco (7,5 t ha-1) com o cultivo e incorporação da Crotalaria juncea L. e 4) testemunha, sem fertilização. Os ensaios de adubação orgânica e cultivo da batata foram realizados no período de 1996 a 2003, com exceção de 1998 e 1999, devido à escassez de chuvas. Ao final de 2003 amostras de solo coletadas nas camadas de 0-20 e 20-40 cm de profundidade foram analisadas. A aplicação anual de esterco, combinado ou não com a crotalária, elevou os teores de CO, N e P totais, e Zn na camada de 0-20 cm de profundidade, e os teores de P e K extraíveis, Mg e B nas duas camadas avaliadas. O cultivo e a incorporação anual da crotalária não exerceram efeito significativo nos teores de nutrientes do solo. Os resultados sugerem que a utilização de doses menores de esterco, combinadas com a incorporação de adubos verdes pode garantir a manutenção da fertilidade do solo em longo prazo. The objective of this study was to evaluate the effects of application of six years of organic manure with animal and/or cover crop on the fertility of an Entisol. Treatments were: 1) animal manure (15 t ha-1); 2) use of Crotalaria juncea L. as a cover crop; 3) fertilization with half (7.5 t ha-1) of the usual doses of animal manure combined with C. juncea L. as a cover crop; and 4) control plots without application. The study was conducted from 1996 to 2003, but no fertilization was done in 1998 and 1999, due to severe droughts. At the end of 2003, soil samples from two depths (0-20 and 20-40 cm) were collected and analyzed to determine the nutrient concentrations. The annual fertilization with animal manure, with or without C. juncea, increased soil extractable P, K, Mg and B in both soil layers, but increased soil organic carbon, total N, total P, and Zn only in the 0-20 cm layer. The cultivation and incorporation of C. juncea had no consistent effect on soil fertility. The results have shown that the application of lower doses of manure combined with C. juncea maintained soil fertility at levels comparable to application of 15 t ha-1 of animal manure.
- Published
- 2008
16. Mudanças na fertilidade de um Neossolo Regolítico após seis anos de adubação orgânica
- Author
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Menezes,Rômulo S. C. and Silva,Tácio O. da
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esterco ,Crotalaria juncea L ,região semi-árida ,micronutrientes ,adubação verde - Abstract
Visou-se, com o presente estudo, avaliar os efeitos de seis anos de adubação orgânica sobre as características químicas de um Neossolo Regolítico cultivado com batata. Os tratamentos de adubação orgânica foram: 1) esterco (15 t ha-1); 2) cultivo e incorporação da Crotalaria juncea L.; 3) combinação de metade da dose de esterco (7,5 t ha-1) com o cultivo e incorporação da Crotalaria juncea L. e 4) testemunha, sem fertilização. Os ensaios de adubação orgânica e cultivo da batata foram realizados no período de 1996 a 2003, com exceção de 1998 e 1999, devido à escassez de chuvas. Ao final de 2003 amostras de solo coletadas nas camadas de 0-20 e 20-40 cm de profundidade foram analisadas. A aplicação anual de esterco, combinado ou não com a crotalária, elevou os teores de CO, N e P totais, e Zn na camada de 0-20 cm de profundidade, e os teores de P e K extraíveis, Mg e B nas duas camadas avaliadas. O cultivo e a incorporação anual da crotalária não exerceram efeito significativo nos teores de nutrientes do solo. Os resultados sugerem que a utilização de doses menores de esterco, combinadas com a incorporação de adubos verdes pode garantir a manutenção da fertilidade do solo em longo prazo.
- Published
- 2008
17. Mineralização de N após incorporação de adubos orgânicos em um Neossolo Regolítico cultivado com milho
- Author
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Menezes, Rômulo S. C. and Salcedo, Ignácio H.
- Subjects
esterco bovino ,Agreste of Paraíba ,agreste paraibano ,semi-arid region ,incubação de solo ,região semi-árida ,cattle manure ,Gliricidia sepium ,soil incubation - Abstract
Normalmente, o esterco disponível nas propriedades no Agreste paraibano é insuficiente para a manutenção da fertilidade do solo enquanto a adubação verde com Gliricidia sepium é uma alternativa para aumentar a disponibilidade de nutrientes. Objetivou-se, no presente trabalho, comparar a dinâmica de mineralização de N após a incorporação de esterco bovino ou de ramas de gliricídia a um Neossolo Regolítico em condições de campo e laboratório. O experimento de campo constou de três tratamentos: incorporação de 20 t ha-1 de esterco bovino, de 15 t ha-1de ramas frescas de gliricídia e testemunha sem adições. Logo após as adições semeou-se milho e se acompanhou o N mineralizado in situ no campo, durante 120 dias, na camada de 0-15 cm e o N absorvido pelo milho. A mineralização de N no laboratório foi acompanhada durante 56 dias em amostras de solo das camadas de 0-15, 15-30 e 30-60 cm; as de 0-15 cm receberam esterco ou gliricídia em quantidades equivalentes às de campo. No campo foram mineralizados 74 kg ha-1 de N até a colheita (120 dias), sem diferenças significativas entre tratamentos. No laboratório, a gliricídia levou a uma rápida mineralização líquida de N enquanto o esterco bovino provocou imobilização nos primeiros 14 dias. Farms within the Agreste region of Paraíba often do not have sufficient animal manure to maintain the fertility of the soil and green manures, such as prunings of Gliricidia sepium, are an alternative to increase nutrient supply. The objectives of this work were to compare N mineralization dynamics following additions of cattle manure or Gliricidia sepium prunings to a Entisol, under field and laboratory conditions. In the field experiment, three treatments were established: addition of 20 t ha-1 of cattle manure; addition of 15 t ha-1 of green branches of Gliricidia, or a control without any addition. Maize was sown immediately after the additions. Soil N mineralization in the field was measured in situ during 120 days, in the 0-15 cm layer. Nitrogen uptake by corn was also recorded. Soil N mineralized in the laboratory was followed during 56 days in samples from the 0-15, 15-30 e 30-60 cm layers. Samples from the 0-15 cm layer received manure and Gliricídia at rates equivalent to those in the field. An average of 74 kg ha-1 of N were mineralized in the field until harvest (120 days). In the laboratory, Gliricidia additions hastened net N mineralization while cattle manure induced net N immobilization during 14 days.
- Published
- 2007
18. Effect of rainfall seasonality on carbon storage in tropical dry ecosystems
- Author
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Rohr, Tyler, primary, Manzoni, Stefano, additional, Feng, Xue, additional, Menezes, Rômulo S. C., additional, and Porporato, Amilcare, additional
- Published
- 2013
- Full Text
- View/download PDF
19. Produtividade de biomassa em sistemas agroflorestais e tradicionais no Cariri Paraibano
- Author
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Martins, Júlio C. R., primary, Menezes, Rômulo S. C., additional, Sampaio, Everardo V. S. B., additional, Santos, Ailton F. dos, additional, and Nagai, Mona A., additional
- Published
- 2013
- Full Text
- View/download PDF
20. Relação entre qualidade e liberação de N por plantas do semiárido usadas como adubo verde
- Author
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Alves, Romildo N., primary, Menezes, Rômulo S. C., additional, Salcedo, Ignácio H., additional, and Pereira, Walter E., additional
- Published
- 2011
- Full Text
- View/download PDF
21. Biomassa e nutrição mineral de forrageiras cultivadas em solos do semiárido adubados com esterco
- Author
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Araújo, Eduardo R., primary, Silva, Tácio O. da, additional, Menezes, Rômulo S. C., additional, Fraga, Vânia da S., additional, and Sampaio, Everardo V. de S. B., additional
- Published
- 2011
- Full Text
- View/download PDF
22. Efeito residual da adubação orgânica sobre a produtividade de milho em sistema agroflorestal
- Author
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Santos, Ailton F. dos, primary, Menezes, Rômulo S. C., additional, Fraga, Vânia S., additional, and Pérez-Marin, Aldrin M., additional
- Published
- 2010
- Full Text
- View/download PDF
23. Disponibilidade de micronutrientes catiônicos em solo arenoso após adubação orgânica
- Author
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Silva, Tácio O., primary and Menezes, Rômulo S. C., primary
- Published
- 2010
- Full Text
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24. Crescimento e absorção de nutrientes pelo algodoeiro e pela mamoneira adubados com gliricídia e esterco
- Author
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Garrido, Marlon da S., primary, Menezes, Rômulo S. C., additional, Sampaio, Everardo V. S. B., additional, and Marques, Tereza R. R., additional
- Published
- 2009
- Full Text
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25. Mudanças na fertilidade de um Neossolo Regolítico após seis anos de adubação orgânica
- Author
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Menezes, Rômulo S. C., primary and Silva, Tácio O. da, additional
- Published
- 2008
- Full Text
- View/download PDF
26. Mineralização de N após incorporação de adubos orgânicos em um Neossolo Regolítico cultivado com milho
- Author
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Menezes, Rômulo S. C., primary and Salcedo, Ignácio H., additional
- Published
- 2007
- Full Text
- View/download PDF
27. N Fertilization for Pearl Millet Grain in the Southern Coastal Plain
- Author
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Menezes, Rômulo S. C., primary, Gascho, G. J., additional, and Hanna, W. W., additional
- Published
- 1999
- Full Text
- View/download PDF
28. Calotropis procera: A preliminary survey on its phytoextraction capabilities in Brazil.
- Author
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Barbosa, Newton P. U., Fernandes, Geraldo Wilson, Uemura, George, de B. C. Menezes, Maria Ângela, Matos, Ludmila V. S., Menezes, Rômulo S. C., and Almeida-Cortez, Jarcilene S.
- Subjects
CALOTROPIS procera ,PHYTOREMEDIATION ,NUCLEAR activation analysis ,TRACE elements - Abstract
Copyright of Neotropical Biology & Conservation is the property of Pensoft Publishers and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)
- Published
- 2013
- Full Text
- View/download PDF
29. Desenvolvimento inicial de mudas de gliricídia e maniçoba preparadas com estacas de quatro comprimentos.
- Author
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Martins, Júlio C. R., Garrido, Marlon da S., Menezes, Rômulo S. C., Dutra, Emmanuel D., Primo, Dário C., and de Jesus, Kennedy N.
- Subjects
GLIRICIDIA ,LEGUMES ,SEED viability ,REFORESTATION - Abstract
Copyright of Brazilian Journal of Agricultural Sciences / Revista Brasileira de Ciências Agrárias is the property of Universidade Federal Rural de Pernambuco and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)
- Published
- 2012
- Full Text
- View/download PDF
30. Contribuição da adubação orgânica na absorção de nutrientes e na produtividade de milho no semiárido paraibano.
- Author
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Primo, Dário C., Menezes, Rômulo S. C., Silva, Tácio O. da, Garrido, Marlon S., and Cabral, Patrícia K. T.
- Subjects
- *
PLANT fertilization , *NUTRIENT uptake , *CORN yields , *ARID regions - Abstract
The aim of this study was to evaluate the contribution of the form and timing of application of organic fertilizers of different grades for nutrients uptake and its relation to the productivity of corn grown in Fluvic Entisol in the semiarid region of the Paraiba State, Brazil. The experiment was conducted at Vila Maria Rita Agroecological Station, in the Cariri region of the state, in a randomized complete block design with four replications. The treatments were: T1 - built-in application of 20 Mg ha-1 of soil gliricidia (GI); T2 - sidedress application of 20 Mg ha-1 of gliricidia (GC); T3 - built-in application of 10 Mg ha-1 manure and 10 Mg ha-1 biomass gliricidia (EI+ GI); T4 - application of 10 Mg ha-1 incorporated manure and 10 Mg ha-1 in sidedress, 45 days after sowing (EI + GC); T5 - built-in application of 10 Mg ha-1 manure (EI); T6 - control without application of organic manure (C). The application of gliricidia in cover (GC) in the soil led to the greatest accumulation of nutrients in corn biomass. The presence of gliricidia alone or in combination with manure favored for a greater synchronization between the soil nutrients availability and the corn demand for nutrients. The application of gliricidia alone and in combination with manure favored the increase in the nutrients export through the straw and corn grain. The use of built-in gliricidia biomass alone and in combination with manure in the Fulvic Entissol is recommended to increase corn productivity. [ABSTRACT FROM AUTHOR]
- Published
- 2012
- Full Text
- View/download PDF
31. Assessment of SITE for CO 2 and Energy Fluxes Simulations in a Seasonally Dry Tropical Forest (Caatinga Ecosystem).
- Author
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Mendes, Keila R., Campos, Suany, Mutti, Pedro R., Ferreira, Rosaria R., Ramos, Tarsila M., Marques, Thiago V., dos Reis, Jean S., de Lima Vieira, Mariana M., Silva, Any Caroline N., Marques, Ana Maria S., da Silva, Duany T. C., da Silva, Daniel F., Oliveira, Cristiano P., Gonçalves, Weber A., Costa, Gabriel B., Pompelli, Marcelo F., Marenco, Ricardo A., Antonino, Antonio C. D., Menezes, Rômulo S. C., and Bezerra, Bergson G.
- Subjects
TROPICAL dry forests ,BIOSPHERE ,FLUX (Energy) ,CARBON dioxide ,HEAT flux ,FOREST dynamics - Abstract
Although seasonally dry tropical forests are considered invaluable to a greater understanding of global carbon fluxes, they remain as one of the ecosystems with the fewest observations. In this context, ecological and ecosystem models can be used as alternative methods to answer questions related to the interactions between the biosphere and the atmosphere in dry forests. The objective of this study was to calibrate the simple tropical ecosystem model (SITE) and evaluate its performance in characterizing the annual and seasonal behavior of the energy and carbon fluxes in a preserved fragment of the Caatinga biome. The SITE model exhibited reasonable applicability to simulate variations in CO
2 and energy fluxes (r > 0.7). Results showed that the calibrated set of vegetation parameters adequately simulated gross primary productivity (GPP) and net ecosystem CO2 exchange (NEE). The SITE model was also able to accurately retrieve the time at which daily GPP and NEE peaked. The model was able to simulate the partition of the available energy into sensible and latent heat fluxes and soil heat flux when the calibrated parameters were used. Therefore, changes in the dynamics of dry forests should be taken into consideration in the modeling of ecosystem carbon balances. [ABSTRACT FROM AUTHOR]- Published
- 2021
- Full Text
- View/download PDF
32. Mediated modeling for integrating science and stakeholders: Impacts of enhanced ultraviolet-B radiation on ecosystem services
- Author
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Van den Belt, Marjan, Costanza, Robert, Demers, Serge, Diaz, Susana Beatriz, Ferreyra, Gustavo Adolfo, Gianesella, Sonia M. F., Koch, Evamaria W., Momo, Fernando Roberto, Vernet, María, Tiessen, Holm, Brklacich, Mike, Breulmann , Gerhard, and Menezes, Rômulo S. C.
- Subjects
Meteorología y Ciencias Atmosféricas ,CIENCIAS NATURALES Y EXACTAS ,Ciencias de la Tierra y relacionadas con el Medio Ambiente - Abstract
Mathematical modeling has historically been the province of experts (van den Belt 2004). When applied to policy questions, which span several disciplines and involve nontechnical stakeholders, the expert modeling approach is severely limited. Models for policy purposes usually become quite complex, and it is difficult to communicate results (or the underlying logic of the models) to decision makers in ways that are “credible” (Costanza and Ruth 1998). Models derive their credibility from two distinct sources: 1) the technical ability of the model to reproduce measured observations, and 2) the degree of “buy-in” to the assumptions of the model by stakeholders involved. Within a scientific discipline, the second source is often taken for granted. But in policy-relevant modeling, it often requires special attention. To achieve the necessary buy-in among the diverse stakeholders affected by a policy problem requires that the stakeholders participate in the modeling process. This chapter focuses on this participatory approach to model building in the context of the impacts of enhanced ultraviolet- B radiation (UVBR) on ecosystem services (Table 20.1). Enhanced UVBR is known from small-scale experiments to have several effects on organisms and ecosystems (Smith et al. 1992). But how those effects scale up and affect ecosystem services is not known. This chapter reports on both a mediated model-building process and the resulting model built jointly by scientists and stakeholders. Fil: Van den Belt, Marjan. Mediated Modeling Partners; Estados Unidos Fil: Costanza, Robert. University Of Vermont.; Estados Unidos Fil: Demers, Serge. Institut des sciences de la mer de Rimouski; Canadá Fil: Diaz, Susana Beatriz. Consejo Nacional de Investigaciones Científicas y Técnicas. Instituto de Investigaciones en Ingeniería Genética y Biología Molecular "Dr. Héctor N. Torres"; Argentina Fil: Ferreyra, Gustavo Adolfo. Consejo Nacional de Investigaciones Científicas y Técnicas; Argentina Fil: Gianesella, Sonia M. F.. Universidade de Sao Paulo; Brasil Fil: Koch, Evamaria W.. University of Maryland; Estados Unidos Fil: Momo, Fernando Roberto. Universidad Nacional de General Sarmiento; Argentina Fil: Vernet, María. University of California; Estados Unidos
- Published
- 2007
33. Impact of coffee biochar on carbon, microbial biomass and enzyme activities of a sandy soil cultivated with bean.
- Author
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Martins Filho AP, Medeiros EV, Lima JRS, Costa DPD, Duda GP, Silva JSAD, Oliveira JB, Antonino ACD, Menezes RSC, and Hammecker C
- Subjects
- Biomass, Charcoal, Coffee, Sand, Carbon analysis, Soil
- Abstract
Biochar has been used to reuse the agro-industrial wastes and improve soil quality. Several studies have been carried out to show the impact of biochar on physical and chemical soil attributes. However, there are still gaps regarding the effects on as microbial biomass and enzymatic activities that are important to determine sensitive indicators to evaluate changes in management practices. The objective of this study was to assess the effect of two biochars on the chemical, microbial biomass carbon, and the enzymatic activities in an Entisol cultivated with bean. We evaluate two types of coffee biochar: ground and husks, four doses (4, 8, 12, and 16 Mg ha-1) and control. All treatments received organic fertilization with cow manure. Husks biochar increase the soil pH, Ca, and K, also contributing to the reduction of toxic aluminum contents and raising the concentrations of P labile. The treatments that received ground biochar showed higher soil organic carbon, microbial biomass, β-glucosidase, and fluorescein diacetate. Biochar produced from coffee residues increased sandy soil quality. We showed the first report on the beneficial impact of coffee biochar on enzymatic and microbiological quality of sandy soil cultivated with the bean.
- Published
- 2021
- Full Text
- View/download PDF
34. Timing and placement of cattle manure and/or gliricidia affects cotton and sunflower nutrient accumulation and biomass productivity.
- Author
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Primo DC, Menezes RSC, Oliveira FF, Dubeux Júnior JCB, and Sampaio EVSB
- Subjects
- Absorption, Physiological physiology, Animals, Biomass, Brazil, Cattle, Crop Production methods, Crop Production standards, Efficiency, Soil chemistry, Time Factors, Fabaceae chemistry, Fertilizers, Gossypium growth & development, Helianthus growth & development, Manure
- Abstract
Organic fertilizers are a viable alternative to increase oilseed productivity in family agriculture systems. The study aimed to evaluate the effects of timing and placement of cattle manure and/or gliricidia (Gliricidia sepium Jacq. Walp) prunings on cotton (Gossipium hirsutum L.) and sunflower (Helianthus annuus L.) nutrient accumulation and biomass productivity. Experiments were carried out in 2010 and 2011 in Taperoá, Paraíba, Brazil. The organic fertilization treatments were: GI - gliricidia incorporated before planting; GS - gliricidia applied on surface 45 days after planting (DAP); MI + GI - manure and gliricidia incorporated before planting; MI + GS - manure incorporated before planting and gliricídia applied on the surface 45 DAP; MI - manure incorporated before planting; and T - with no organic fertilization. In 2010, treatment MI + GS increased N, P, and K accumulation in cotton (12 and 7 kg ha-1) as well as in sunflower (20 and 29 kg ha-1). In 2011, GI and GS treatments resulted in higher N, P, K accumulations in both crops. The highest cotton productivity in 2010 was obtained with MI + GS treatment (198 kg ha-1) and in 2011 with GS treatment (594 kg ha-1). For sunflower, MI + GS treatment yielded the highest productivity in 2010 (466 kg ha-1) and GI treatment in 2011 (3542 kg ha-1). GI and MI + GS treatments increased total biomass productivity for cotton and sunflower. The treatment that combined both cattle manure incorporated into the soil before planting and gliricidia applied on the surface 45 days after planting was the most viable management strategy.
- Published
- 2018
- Full Text
- View/download PDF
35. Isotopic evidence of the effects of herbivory and landscape position on plant nitrogen sources in a riparian ecosystem.
- Author
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Menezes RS
- Subjects
- Animals, Colorado, Nitrogen chemistry, Nitrogen metabolism, Nitrogen Isotopes analysis, Seasons, Water Supply, Carex Plant metabolism, Deer physiology, Ecosystem, Feeding Behavior, Fresh Water chemistry, Nitrogen analysis, Salix metabolism
- Abstract
This study used (15)N natural abundance techniques to investigate whether elk herbivory affects the capability of willow (Salix spp.) and reed-grass (Carex spp.) to access N from groundwater in upper and lower landscape positions within riparian areas of the Rocky Mountain National Park. For this, delta(15)N values of plant, soil, rainfall and groundwater samples were measured within a replicated field experiment. Despite the relatively high variability in the (15)N data, it provided evidence of the effects of grazing and lanscape position on plant N sources. Carex seemed to acquire less groundwater N in upper landscape positions compared to Salix, maybe due to the deeper willow rooting system. However, grazed willows in upper landscape positions seemed to acquire less groundwater N as compared to willows protected from herbivory. These findings were in accordance with other isotopic and non-isotopic studies conducted in the same experimental site.
- Published
- 2009
- Full Text
- View/download PDF
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