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Copyright of Revista Foco (Interdisciplinary Studies Journal) is the property of Revista Foco 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.)

Copyright of Revista Caatinga is the property of Revista Caatinga 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.)

Introducción. Tectona grandis es la especie con la mayor área plantada en Costa Rica, por los altos precios en el mercado internacional. La producción de plantas para reforestación se ha tecnificado en el país, se desarrolla basado en tecnologías de ambientes protegidos, que permiten aumentar la productividad, disminuir costos de operación y ofrecer material de siembra durante todo el año. Objetivo. Evaluar el efecto de dos sustratos y cinco densidades de siembra en la productividad de minijardines clonales de Tectona grandis dentro de un ambiente protegido. Materiales y métodos. Se caracterizaron mediante análisis de granulometría y retención de humedad, cuatro sustratos inertes de fácil adquisición, de ellos se seleccionó el polvo de piedra como óptimo. Se estableció un ensayo experimental con diseño factorial 2x5 en San Carlos, Costa Rica, para evaluar dos sustratos (polvo de piedra solo y con 25 % de carbón) y cinco densidades de siembra (cm) de 10x10, 10x5, 7x5, 10x10 con dos plantas por hoyo y 10x10 con una planta en el medio. Cada densidad tuvo cuatro clones como efecto repetición. El ensayo se evaluó durante cinco ciclos continuos de producción de enero a setiembre del 2021. Resultados. El uso del polvo de piedra sin carbón como sustrato, registró la mayor productividad a un menor costo. El arreglo espacial de siembra de 10x10 cm con una planta en el centro (n=145 plantas/m2), registró la mayor producción de brotes por planta madre (1,16). El arreglo 7x5 cm aumentó la productividad hasta en 206 brotes m2/mes. Conclusión. El cambio de densidad de siembra del minijardín clonal, en una primera etapa a 10x10 cm con una planta en el centro, resultó en alto impacto en productividad (74 %), mayor eficiencia en el uso del espacio y mejor gradualidad del cambio en el sistema operativo.

Uma das mais importantes etapas na produção da muda cítrica é a obtenção de porta-enxertos com identidade genética definida, em relação às variedades que se deseja propagar, e isentos de pragas. O presente experimento teve como objetivo estudar o desenvolvimento de porta-enxertos cítricos, até o ponto de enxertia, após sua transferência para sistema de cultivo hidropônico. Foi instalado e conduzido em delineamento inteiramente casualizado, em esquema fatorial 4 porta-enxertos (limoeiro ‘Cravo Santa Cruz’, tangerineiras ‘Cleópatra’ e ‘Sunki Tropical’ e o híbrido TSKC x (LCR x TR) - 059) x 3 alturas de planta na ocasião da transferência (0, 3 e 6 cm), com quatro repetições e dez plantas por parcela, totalizando 480 plantas. O tratamento 0 (zero) correspondeu a sementes submetidas à germinação já em solução nutritiva, enquanto que os tratamentos referentes aos 3 e 6 cm de altura de planta foram mantidos em solução aquosa até o atingimento dessas alturas, quando, então, foram transferidos para solução nutritiva. Avaliou-se (1) a germinação das sementes através do Índice de Velocidade de Emergência (IVE) e percentagem de emergência, (2) o desenvolvimento das plantas e (3) sua produção de biomassa. O híbrido TSKC x (LCR x TR) - 059 teve o IVE reduzido quando cultivado desde a germinação em solução nutritiva. As tangerineiras podem ser semeadas já em solução nutritiva. O limoeiro ‘Cravo Santa Cruz’ e o híbrido TSKC x (LCR x TR) - 059, quando transferidos com 6 cm de altura para a solução nutritiva, tiveram um melhor desenvolvimento em altura e diâmetro. Estes produziram maior quantitativo de biomassa. O limoeiro ‘Cravo Santa Cruz’ apresentou área foliar superior à dos demais porta-enxertos.

Rose production in Colombia takes place almost entirely in naturally ventilated greenhouses. The objective of this work was to replicate the characterization of the microclimate generated inside a greenhouse through the modeling of air flows using CFD software, taking into account the evapotranspiration of the crop. The CFD-3D model used was validated by collecting experimental data collected in the field, focusing on the variables of temperature and relative humidity. The results obtained show that for the evaluated condition the generated microclimate varies if evapotranspiration is taken into account in the model, although the conditions found are still optimal for rose production. [ABSTRACT FROM AUTHOR]

El objetivo de la investigación fue establecer correlaciones de Pearson en pimiento cultivado bajo invernadero, utilizando dos tipos de poda (española y holandesa), entre la densidad de siembra y las siguientes variables: número de frutos (por planta y por m2), peso del fruto, y rendimiento total y comercial. Con poda holandesa las correlaciones entre la densidad de siembra y las variables evaluadas no fueron significativas. Con poda española se presentaron cinco correlaciones de Pearson con significancia estadística (p≤0,05), en cuyo caso se obtuvieron las regresiones lineales; estas correlaciones fueron entre la densidad de siembra y: número total de frutos por planta (r=–0,63*); número de frutos de primera calidad por planta (r=–0,87**); número de frutos de segunda calidad por m2 (r=0,61*); rendimiento de segunda calidad (r=0,76**); y rendimiento comercial (r=0,64*). Se concluye que, con poda española, la mejor opción desde el punto de vista económico es el uso de la mayor densidad de siembra.

It was intended to evaluate the influence of indolebutyric acid (IBA) and zinc upon the rooting and development of rootstock of ‘Cravo’ lemon tree transplants of bare root to the modified hydroponic system in the grafting stage. Plants of rootstocks were treated by immersion of their root system into the different solutions tested for 24 hours. The experiment was arranged in a completely randomized design with seven treatments composed of IBA doses of 50, 100 and 200 mg.L-1 and Enervig® which contains in its formulation 33.92 g.L-1 of Zn at 60, 90 and 120 ml.L-1, and distilled water as a control with three replications and nine plants per plot, amounting to 189 plants , 15 cm tall. The rootstocks were transplanted to the tubes and taken to the modified hydroponic system, being evaluated (1) the development of the plants and (2) the time needed for the rootstocks to reach the grafting stage, considered ideal between 5 and 6 mm in diameter. The treatment with a solution of 100 mg.L-1of IBA proved superior to the others in the development of height and biomass yield and tended to provide greater stem diameter development. The grafting point was obtained, on average at 70 days after transplanting and the production of Rangpur lime trees in a hydroponic system may be recommended. When the root system of the ‘Cravo’ lemon tree was treated with 100 mg.L-1 solution the IBA grafting point was obtained at 45 days after transplanting.

Este trabalho foi realizado com o objetivo de avaliar o desenvolvimento do capim vetiver (Chrysopogon zizanioides L. Roberty) cultivado em colunas de PVC e adubado com diferentes níveis de esterco bovino sob condições de ambiente distintas. O experimento foi instalado em delineamento inteiramente casualizado, com três repetições, em esquema fatorial 5 x 2, sendo cinco níveis de esterco bovino (0%, 10%, 20%, 30% e 40%) e dois tipos de ambiente (ambiente livre e ambiente protegido com tela de sombreamento de 80% de abertura), totalizando 30 unidades experimentais. Foram realizadas avaliações referentes à altura de planta e ao número de brotos aos 15, 30, 45 e 60 dias após o transplantio (DAT). Aos 60 DAT, no final do experimento, as plantas foram separadas para determinação do comprimento da raiz e da produção de massa verde e seca da parte aérea e da raiz. Os resultados obtidos permitiram constatar que a ausência de esterco bovino contribuiu para o maior desenvolvimento do sistema radicular das plantas de capim vetiver. O nível de 10% de esterco bovino proporcionou maior número de brotos e acréscimo na massa verde da parte aérea e nas massas verde e seca da raiz. O ambiente livre proporcionou o maior desenvolvimento das plantas de capim vetiver.

O presente estudo objetivou avaliar a produção de mudas de melão em ambiente protegido em função do uso de substratos à base de ramas de mandioca trituradas submetidas a diferentes períodos de compostagem. O experimento foi conduzido em delineamento inteiramente casualizado, em esquema fatorial 5 x 2, cujos tratamentos corresponderam a combinação de cinco períodos de compostagem de ramas de mandioca trituradas (0; 30; 60; 90 e 120 dias) e duas variedades de melão (Gaúcho Casca de Carvalho e Melão Amarelo) em ambiente protegido. Na emergência das plântulas, iniciaram-se as avaliações do índice de velocidade de emergência e porcentagem de emergência. Aos 30 dias após a semeadura foram avaliadas altura de plantas, diâmetro de colos, comprimento do sistema radicular, massa seca da parte aérea, massa seca das raízes, massa seca total e Índice de qualidade de Dickson. Os dados foram submetidos à análise de variância. Os efeitos do tempo de compostagem foram avaliados por regressão polinomial e os efeitos das variedades pelo teste F (5%), verificando e desdobrando as interações. As variedades apresentaram parâmetros fisiológicos satisfatórios perante os períodos de compostagem do substrato, onde a variedade Melão Amarelo apresentou melhores resultados de desenvolvimento. A variedade Melão Amarelo apresenta melhor desenvolvimento das mudas em relação à variedade Gaúcho Casca de Carvalho nas condições do presente estudo. O período de compostagem de 120 dias é o mais indicado para a produção de mudas de melão, pois apresentam melhor desenvolvimento da parte aérea, sistema radicular e incrementos na massa seca total.

O presente trabalho teve como objetivo avaliar a influência de diferentes substratos orgânicos no crescimento, produtividade e classificação de frutos de tomateiro cereja das cultivares Cascade e Samambaia em ambiente protegido. O delineamento experimental adotado foi o inteiramente casualizado, com seis tratamentos e quatro repetições. Os tratamentos consistiram em seis substratos, resultantes da combinação de solo (SC), esterco bovino (EB), casca de arroz (CA) e cinza de casca de arroz (CC), nas proporções: 70% SC + 10% EB + 10% CA + 10% CC (S1); 60% SC + 20% EB + 10% CA + 10% CC (S2); 50% SC + 30% EB + 10% CA + 10% CC (S3); 60% SC + 30% EB + 10% CA (S4); 70% SC + 20% EB + 10% CA (S5); e 100% SC (S6). As avaliações consistiram em analisar o comprimento da parte aérea, número de folhas, número e massa fresca de frutos, diâmetro vertical e horizontal do fruto, estimação da produtividade e classificação. O substrato composto por solo não se mostrou eficiente, apresentando os menores valores para todas as variáveis. Para a cultivar Cascade, os substratos S1, S2 e S5 demonstram ser favoráveis aos parâmetros agronômicos do tomateiro cereja, possibilitando um maior número de frutos comercializáveis. Para a cultivar Samambaia novos estudos precisam ser realizados com diferentes fontes e proporções a fim de obter o substrato mais adequado para o cultivo. Portanto, para a produção de tomate cereja da cultivar Cascade os substratos compostos de resíduos obtidos do beneficiamento do arroz e dejetos de bovinos, apresentaram-se como fontes alternativas no cultivo do tomateiro.

Chrysanthemum is one of the most commercialized flower species in Brazil, however, there is little information related to the correct water management of the crop. Thus, the work seeks to determine the crop evapotranspiration (ETc) and obtain the cultural coefficients (Kc) of the pot chrysanthemum, in addition to assessing the water use efficiency (EUA) of the crop under different irrigation managements. The experiment was conducted in a protected environment in Santa Maria-RS, which a completely randomized design (DIC) was used, with five treatments based on the capacity of water retention in the vessel (CRV) (40, 60, 80, 100 and 120% CRV), with 16 repetitions, each pot was considered one repetition. ETc was determined by weighing Lysymetry, ETo was calculated by six different equations: Benevides-Lopez, Camargo, Linacre, Jensen-Haise, Hargreaves and Ivanov. Kc was obtained by the relationship between ETc and ETo. The evapotranspiration of the culture ranged between 153 and 264 mm. There was no significant difference in the EUA between the treatments studied. The average Kc was 0.98 for the vegetative phase, 1.29 from the beginning of the reproductive phase to the point of commercialization and 0.85 until the end of the reproductive phase. [ABSTRACT FROM AUTHOR]

Copyright of Revista Brasileira de Engenharia Agricola e Ambiental - Agriambi is the property of Revista Brasileira de Engenharia Agricola e Ambiental 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.)

Copyright of Revista IRRIGA - Brazilian Journal of Irrigation & Drainage is the property of Revista IRRIGA (Brazilian Journal of Irrigation & Drainage) 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.)

Copyright of Nativa is the property of Revista Nativa 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.)

O presente trabalho teve como objetivo avaliar o efeito das telas de 50% de sombreamento coloridas sobre a emergência e o desenvolvimento de mudas de três espécies de fisális. O delineamento experimental foi blocos ao acaso, em esquema de parcelas subdivididas com quatro repetições. As telas utilizadas apresentaram 50% de sombreamento e quatro colorações + cultivo a pleno sol. As subparcelas consistiram de três espécies de fisális. A semeadura foi realizada em tubetes e o desbaste ocorreu 40 dias após a semeadura. Durante este período foram avaliadas algumas variáveis fitotécnicas e fisiológicas. A emergência das plantas foi favorecida em ambiente com presença de telas. Os ambientes de cultivo apresentaram interação com as espécies em relação ao índice de velocidade de emergência, diâmetro do colo, altura das plantas, biomassa seca de folha e na taxa de transpiração das mudas. Os ambientes não interferiram na taxa assimilatória líquida, radiação fotossinteticamente ativa, índiceSPAD, biomassa seca de raízes, caule e folhas, e no número de folhas por planta. As telas de sombreamento interferiram na temperatura do ar e umidade relativa do ar e em algumas características fitotécnicas. O uso da tela de sombreamento cor preta proporciou uma muda de melhor qualidade.

Este trabalho teve objetivo de avaliar o efeito da adição de cama de frango (CF) e esterco bovino (EB) à fibra de coco (FC) na formulação de um substrato para produção de mudas de alface tipo americana. O experimento foi conduzido no município de Mossâmedes-GO, no período de outubro de 2016 a novembro de 2016. O cultivo foi conduzido em estufa coberta de PEBD translúcido. O experimento foi realizado em delineamento inteiramente casualizado, sendo sete tratamentos de substratos (100%FC; 90%FC + 10%EB; 80%FC + 20%EB; 60%FC + 40%EB; 90%FC + 10%CF; 80%FC + 20%CF; 60%FC + 40%CF) e 40 repetições. Foi realizada análise física e química dos sete substratos. Avaliou-se a porcentagem de emergência; a massa do sistema radicular e parte aérea no momento do transplantio. A fibra de coco pura, como substrato, e sem fertirrigação é inviável para a produção de mudas de alface. Os substratos formulados com 80% de fibra de coco + 20% de esterco bovino curtido e 60% de fibra de coco + 40% de esterco bovino curtido são adequados para produção de mudas de Alface. A cama de frango mostrou-se uma fonte muito salina, mesmo curtida, comprometendo a emergência e desenvolvimento das mudas.

Objetivando-se avaliar o desempenho de cultivares de alface crespa produzidas em hidroponia a partir de mudas produzidas em floating e espuma fenólica, realizou-se um experimento em casa de vegetação, na Fazenda Experimental da Universidade de Marília-SP. O delineamento experimental adotado foi o inteiramente casualizado em esquema fatorial 2 x 2, com cinco repetições, cujos fatores corresponderam respectivamente, a dois sistemas de cultivo para a produção de mudas (floating e espuma fenólica) e duas cultivares de alface crespa (Jullie e TPC). Foram avaliadas as características massa fresca e seca da parte aérea, número de folhas por planta e comprimento do caule. Ocorreram diferenças significativas entre cultivares para todos os caracteres avaliados. Diferença estatística significativa entre sistemas de cultivos foi observada somente para o comprimento de caule. A interação cultivar x sistemas de cultivos não foi significativa para nenhum dos caracteres avaliados. No número de folhas por planta a cultivar TPC foi superior a “Jullie” independente do sistema de cultivo. Já para o comprimento de caule, constatou-se que as duas cultivares apresentaram valores superiores no sistema floating em relação à espuma fenólica e que a cultivar Jullie apresentou comprimento de caule maior que a “TPC” na espuma fenólica. Esses valores mais altos são indesejáveis, uma vez que são responsáveis pelo pendoamento precoce na alface. Para a massa seca da parte aérea verificou-se que a cultivar Jullie foi superior a “TPC” na espuma fenólica, porém não ocorreu diferença entre elas no sistema floating. Conclui-se que nas condições em que foi conduzido o experimento que a cultivar Jullie apresentou maior massa fresca da parte aérea do que a cultivar TPC e que no número de folhas a “TPC” se destacou em relação à “Jullie” e que os sistemas de cultivos não influenciaram no rendimento das cultivares.

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The massive production of high-quality seedlings can improve the conservation and commercial reforestation plans of the Colombian mahogany (Cariniana pyriformis Miers), a native forest species of Colombia. To contribute to this objective, two environments were evaluated. The first was an arched protected environment of structure covered with anti-thermal low-density polyethylene film to offer 50% shade and photoselective to U.V radiation, while the second was an agricultural nursery covered with black monofilament screen and mesh to offer 65% shading. Each environment adopted an experimental design of complete random blocks into a split-plot scheme. The main plot comprised five substrates that contained different volumetric proportions of river sand (SA), pine bark (PB), coconut fiber (CF), commercial compost obtained from composting poultry manure, cane dust and sawdust powder (CC), and subsoil from the study region (SS). The subplot was two seedling ages: 77 and 95 days after sowing. The values for the Dickson quality index, leaf area, dry mass of the aerial part and the root system, for both ages, was higher inside the protected environment. The agricultural nursery did not evidence substrates effect. For both environments and ages, optimal morphological attributes were not reached in the seedlings to be established in the field. The substrate based on 20% SA + 20% CC and 60% SS is the best as it increases seedling vigor, followed by the 20% PB + 20% CC + 60% SS composition. [ABSTRACT FROM AUTHOR]

The objective of this paper was to evaluate the effect of the 50% colored shading on the emergence and development of seedlings of three Physalis species. The experimental design used was a completely randomized block design with subdivided plots and four replicates. The treatments consisted of screens providing 50% shading and four colorations, as well as cultivation in full sunlight. The subplots consisted of three species of Physalis. Seeding was carried out in tubes and thinning was performed 40 days after sowing. During this period, the phytotechnical and physiological variables were evaluated. Plant emergence was favored by the screens. The cultivation environments interacted with the species regarding the emergence speed index, collar diameter, plant height, dry leaf biomass, and seedling transpiration rate. The environments did not interfere with the net assimilation rate, active photosynthetic radiation, SPAD index, dry root, stem and leaf biomass, and number of leaves per plant. The shading screens interfered with the air temperature and relative air humidity, as well as with a few phytotechnical characteristics. The use of a black shading screen provided a higher quality seedling. [ABSTRACT FROM AUTHOR]

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Copyright of Tecno-Lógica is the property of Tecno-Logica 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.)

The objective of this study was to evaluate the influence of substrates on the growth and yield of Cascade and Samambaia cherry tomato cultivars under protected environment. A completely randomized experimental design with six treatments and four replications was adopted. The treatments consisted of six substrates resulting from the combination of soil (CS), bovine manure (BM), rice husk (RH) and rice hull ash (RA), in the proportions: S1 - 70% SC + 10% BM + 10% RH + 10% RA; S2 - 60% SC + 20% BM + 10% RH + 10% RA; S3 - 50% SC + 30% BM + 10% RH + 10% RA; S4 - 60% SC + 30% BM + 10% RH; S5 - 70% SC + 20% BM + 10% RH; and S6 - 100% SC. Plant growth, yield and development parameters were evaluated. Cherry tomato growth and yield changed according to the substrate characteristics. The substrate composed by soil was not efficient, presenting the lowest values for all the vegetative and reproductive parameters studied. The substrates made from alternative ecologically based residues are interesting and alternative sources for tomato cultivation aiming at the reuse of the matter and the sustainability of the production system. [ABSTRACT FROM AUTHOR]

O Brasil é considerado um dos maiores produtores de frutas exóticas do mundo e o cultivo da pitaya amarela (Hylocereus megalanthus) tem se destacado, apesar de estudos relacionados ao manejo dessa cultura serem incipientes O presente estudo teve por objetivo avaliar os efeitos de doses do formulado N-P2O5-K2O (NPK) na concentração 08-20-20 em mudas de pitaya amarela conduzidas em condições de casa de vegetação, contendo como substrato areia e composto orgânico (3:2, v:v). O delineamento experimental foi o de blocos ao acaso com seis tratamentos e cinco repetições. Os tratamentos consistiram na aplicação das seguintes doses do formulado NPK (08-20-20): 0, 200, 250, 300, 350 e 400 g por vaso de 5 L. As variáveis avaliadas foram taxa de enraizamento, altura, diâmetro, massa fresca (MF), massa seca (MS) da parte aérea e teor dos nutrientes dos cladódios. Apesar da aplicação de 300 g por vaso ter resultado em maior concentração de N, P, K, Ca, Mg, S, Fe e Zn nos cladódios de pitaya, a utilização de apenas adubo orgânico e areia mostrou-se suficiente para o incremento da MS e MF dos cladódios.

As hortaliças cultivadas em ambiente sombreado vêm ganhando mais espaços frente ao sistema de plantio em campo aberto, destaca-se o pimentão, por estar entre as dez culturas mais produzidas. Assim, objetivou-se avaliar a eficiência de fontes e fertilizantes potássicos na nutrição de plantas de pimentão (Capsicum annuum L.), sob sistema orgânico. O delineamento experimental utilizado foi em blocos casualizados, sendo utilizadas duas fontes de potássio: sulfato de potássio (50% de K) e cinza de madeira (5,84% de K) em seis blocos, com três plantas cada. O tratamento com cinza de madeira obteve maior desempenho quanto às seguintes variáveis: número de frutos por planta, massa média dos frutos, comprimento dos frutos, espessura de polpa, produtividade comercial. Quanto às variáveis químicas, a adubação com cinza de madeira obteve resultados superiores para sólidos solúveis, vitamina C e acidez titulável. Com base nos resultados obtidos, pode-se concluir que o tratamento com adubação com cinza de madeira foi promissor no tocante às características físicas e, apenas para o pH, obteve-se valores inferiores aos demais tratamentos. A utilização da cinza de madeira como fonte de nutrição de plantas de pimentão, resultou em uma maior produtividade comercial.

Copyright of Revista Brasileira de Agricultura Irrigada - RBAI is the property of Revista Brasileira de Agricultura Irrigada - RBAI 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.)

Copyright of Argentinian Horticulture / Horticultura Argentina is the property of Revista Horticultura Argentina 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.)

Copyright of Revista Brasileira de Engenharia Agricola e Ambiental - Agriambi is the property of Revista Brasileira de Engenharia Agricola e Ambiental 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.)

Copyright of Revista Brasileira de Engenharia Agricola e Ambiental - Agriambi is the property of Revista Brasileira de Engenharia Agricola e Ambiental 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.)

The vegetables grown in a shaded environment have been gaining more space in front of the open field planting system. Among the vegetables, it stands out the pepper, being among the ten most produced crops. The objective of this study was to evaluate the efficiency of potassium sources and fertilizers in the nutrition of pepper plants (Capsicum annuum L.) under an organic system. The experimental design was a randomized complete block design, using two sources of potassium: potassium sulphate (50% K) and wood ash (5,84% K) and six blocks, each with three plants. ash yielded higher performance in relation to the following variables: number of fruits per plant, mean fruit mass, fruit length, pulp thickness, commercial productivity. With chemical variables, fertilization with wood ash yielded superior results for soluble solids, vitamin C, and titratable acidity. On the basis of the results obtained, it can be concluded that the treatment with wood ash fertilization was promising regarding the physical characteristics and, for the pH only, lower values were obtained than the other treatments. use of wood ash as a source of nutrition for sweet pepper plants resulted in higher commercial productivity. [ABSTRACT FROM AUTHOR]

Copyright of Revista IRRIGA - Brazilian Journal of Irrigation & Drainage is the property of Revista IRRIGA (Brazilian Journal of Irrigation & Drainage) 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.)

Copyright of Revista Caatinga is the property of Revista Caatinga 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.)

Copyright of Revista Brasileira de Agricultura Irrigada - RBAI is the property of Revista Brasileira de Agricultura Irrigada - RBAI 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.)

Copyright of Nativa is the property of Revista Nativa 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.)

Copyright of Revista Brasileira de Agricultura Irrigada - RBAI is the property of Revista Brasileira de Agricultura Irrigada - RBAI 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.)

Copyright of Revista Chapingo Serie Horticultura is the property of Universidad Autonoma Chapingo 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.)

ABSTRACT The objective of the present study was to evaluate the effect of nitrogen doses applied via fertigation and associated with different types of crop establishment fertilization on growth and biomass of radish. The experiment was conducted in a greenhouse of the Academic Unit of Agricultural Engineering, Federal University of Campina Grande, from April to May 2014. Treatments consisted of five doses of nitrogen fertilizer applied by fertigation (0, 0.7, 1.4, 2.1 and 2.8g per pot) and three types of crop establishment fertilization (humus 2:2; NPK and control), arranged in a 5 x 3 factor design with four repetitions. The 15 treatments were arranged in 60 plots. The nitrogen source used in the study was urea, divided in three applications: the first application was carried out eight days after transplanting, the second, on day 15, and the third, on day 22. The crop establishment fertilization significantly influenced the growth variables and plant mass of the radish on day 35 after transplanting. The highest values of the variables (number of leaves, plant height, bulb diameter, leaf area, fresh mass of the aerial part, dry mass of the aerial part and root/aerial part were observed in the treatment with humus on day 35 after transplanting. The dose of 2.8g nitrogen per pot corresponding to 6.22g of urea per plant provided the highest yield for the variable number of leafs, leaf area and root length on day 35 after transplanting.

In regions with intense solar radiation it is common the use of aluminated covers in greenhouses, with the aim of reducing the inside temperature. However, the use of these covers reduces photosynthetic active radiation (PAR) transmitted into the greenhouse. The objective of the present study was to evaluate the influence of different covers on microclimate in greenhouses cultivated with cherry tomato during three growing seasons. The environment I was covered with plastic film anti-UV and with thermo-reflective screen (40%) disposed internally. The environment II was covered with diffusive plastic film (55%). The transmitted solar radiation to the interior of covered environments was, on average, 5.5 MJ m-2 day-1 in the environment I and 8.2 MJ m-2 day-1 in environment II. The air temperature in environment II was, on average, 1°C higher than external conditions. The highest difference for the relative humidity (RH) was also observed between environment II and the outside conditions, with 10.7% for the minimum RH during the first growing period. Considering all growing periods, the diffusive plastic film provided higher solar energy availability inside the greenhouse than the plastic film with thermo-reflective screen, without causing major changes in air temperature and relative humidity, and promoting greater productivity of tomato grown under this environment for the three periods evaluated.

Copyright of Revista Brasileira de Engenharia Agricola e Ambiental - Agriambi is the property of Revista Brasileira de Engenharia Agricola e Ambiental 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.)

Copyright of Revista Caatinga is the property of Revista Caatinga 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.)

The type of environment and substrates quality in seedlings production are essential for the production of productive plants under field conditions. In order to determine the best environment and substrate for seedlings production of two tomato cultivars (IPA 06 and Santamélia), two experiments, completely randomized and arranged in subdivided plots with five replicates, were conducted under the environmental conditions of Boa Vista, Roraima, Brazil. Treatments consisted of the association among five environments (A1 - greenhouse, A2 - Chromatinet ® 35% red, A3 - Chromatinet ® 50% red, A4 - Chromatinet ® 35% Silver and A5 - Chromatinet ® 50% Silver) and four substrates S1 - OrganoAmazon®; S2 - OrganoAmazon® + PuroHumus®; S3 - OrganoAmazon® + PuroHumus® + soil + bovine manure, and S4- OrganoAmazon® + PuroHumus® + soil + bovine manure + carbonized rice husk (CRH) on the following variables: number of leaves, plant height, stem diameter, dry shoot and root biomass, plant height/stem diameter ratio accordingly to colon & Dickson quality index of seedlings. Substrates made with the addition of PuroHumus®, without presenting CRH (S2 and S3), which favored the increasing of all analyzed variables. In addition, greenhouse, especially when is associated to S2 substrate, had achieved the best environment for seedlings production of the two evaluated tomato cultivars. Photoconverter shading nets we are not efficient in tomato seedlings production under climatic conditions of Boa Vista, Roraima, Brazil. [ABSTRACT FROM AUTHOR]

Knowing the productive variability within protected environments is crucial for choosing the experimental design to be used in that conditions. Thus, the aim of the present study was to assess the variability of fruit production in protected environment cultivated with cherry tomatoes and to verify the border effect and plot size in reducing this variability. To this, data from an uniformity test carried out in a greenhouse with cherry tomato cv. 'Lili' were used. Total fresh mass of fruits per plant was considered being these plants arranged in cropping rows parallel to the lateral openings of the greenhouse and also the same plants arranged in columns perpendicular to these openings. To generate the borders, different scenarios were designed by excluding rows and columns and using different plot sizes. In each scenario, homogeneity of variances among the remaining rows and columns was tested. There is no variability of fruit production among rows or columns in trials with cherry tomatoes carried out in greenhouses and the use of border does not bring benefits in terms of reduction of coefficient of variation or reduction of cases of variance heterogeneity among rows or columns. Plots with a size equal to or greater than two plants make possible to use the completely randomized design in the cherry tomato trials in greenhouses. [ABSTRACT FROM AUTHOR]