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Made available in DSpace on 2022-04-28T16:55:55Z (GMT). No. of bitstreams: 0 Previous issue date: 2021-08-04. Added 1 bitstream(s) on 2022-04-28T17:10:59Z : No. of bitstreams: 1 S1415-43662005000500314.pdf: 121782 bytes, checksum: 36358ab91d3df287d9022867cc69e1e7 (MD5) Com a finalidade de avaliar os efeitos da salinidade da água de irrigação com valores de 0,5, 1,5 e 2,5 dS m-1 e diferentes formas de plantio, sobre o crescimento e a produção do maracujazeiro-amarelo (Passiflora edulis f. flavicarpa Deg.), desenvolveu-se este experimento, no período de maio de 2001 a março de 2002, no município de Remígio, Paraíba. As formas de plantio foram: a) convencional; b) em covas, com as faces laterais protegidas com filme de polietileno e c) em bolsas de polietileno, com 40 cm de diâmetro e 60 cm de altura. O diâmetro caulinar e a produção das plantas foram mais inibidos pelos sistemas de cultivo que pelo aumento de salinidade da água. O tipo de plantio que mais prejudicou as plantas e salinizou o solo foi em bolsas de polietileno. A umidade e a condutividade elétrica aumentaram em função da redução das perdas hídricas do solo, na ordem: cultivo em bolsas de polietileno > em covas com as faces protegidas lateralmente > no sistema de cultivo convencional. In order to evaluate the effects of salinity water irrigation at levels of 0.5; 1.5 and 2.5 dS m-1 under different planting types on growth and production of yellow passion fruit plants, Passiflora edulis f. flavicarpa Deg., was carried out during the period of May 2001 to March 2002 an experiment in Remígio County Paraíba State, Brazil. The planting types were: a) conventional planting; b) planting in caves with covering of lateral sides with polyethylene film; c) planting in polyethylene bags with 60 cm of height and 40 cm of diameter. The plants presents the stem diameter and production more inhibited by planting types in relation to increment of salinity water irrigation. The planting type than more inhibited the growth and plants production and increased the soil salinity was in polyethylene bags. The soil water content and electrical conductivity values increased as function of the loss hydric reduction of the reduction soil in sequence: planting in polyethylene bags > planting in caves with polyethylene film in lateral sides > planting in traditional form. UFPB, CCA UEPB, Escola Agrotécnica UFLA UNESP, FCAV CNPq UNESP, FCAV

Resumo Com a finalidade de avaliar os efeitos da salinidade da água de irrigação com valores de 0,5, 1,5 e 2,5 dS m-1 e diferentes formas de plantio, sobre o crescimento e a produção do maracujazeiro-amarelo (Passiflora edulis f. flavicarpa Deg.), desenvolveu-se este experimento, no período de maio de 2001 a março de 2002, no município de Remígio, Paraíba. As formas de plantio foram: a) convencional; b) em covas, com as faces laterais protegidas com filme de polietileno e c) em bolsas de polietileno, com 40 cm de diâmetro e 60 cm de altura. O diâmetro caulinar e a produção das plantas foram mais inibidos pelos sistemas de cultivo que pelo aumento de salinidade da água. O tipo de plantio que mais prejudicou as plantas e salinizou o solo foi em bolsas de polietileno. A umidade e a condutividade elétrica aumentaram em função da redução das perdas hídricas do solo, na ordem: cultivo em bolsas de polietileno > em covas com as faces protegidas lateralmente > no sistema de cultivo convencional. Abstract In order to evaluate the effects of salinity water irrigation at levels of 0.5; 1.5 and 2.5 dS m-1 under different planting types on growth and production of yellow passion fruit plants, Passiflora edulis f. flavicarpa Deg., was carried out during the period of May 2001 to March 2002 an experiment in Remígio County Paraíba State, Brazil. The planting types were: a) conventional planting; b) planting in caves with covering of lateral sides with polyethylene film; c) planting in polyethylene bags with 60 cm of height and 40 cm of diameter. The plants presents the stem diameter and production more inhibited by planting types in relation to increment of salinity water irrigation. The planting type than more inhibited the growth and plants production and increased the soil salinity was in polyethylene bags. The soil water content and electrical conductivity values increased as function of the loss hydric reduction of the reduction soil in sequence: planting in polyethylene bags > planting in caves with polyethylene film in lateral sides > planting in traditional form.

Made available in DSpace on 2018-11-26T15:38:03Z (GMT). No. of bitstreams: 0 Previous issue date: 2016-10-01. Added 1 bitstream(s) on 2019-10-09T18:25:08Z : No. of bitstreams: 1 S0100-69162016000601239.pdf: 665119 bytes, checksum: a731c444480966278d539c2dbd1f4909 (MD5) Simulation models of crop growth enable estimating crop yield and water balance components with low cost and high precision. This study aimed to calibrate and evaluate the performance of the CS-CROPGRO model for common beans under the conditions of Jaboticabal city (SP), Brazil. The model was calibrated and tested with data previously collected from two experiments conducted in 2002 and 2003. In these experiments, treatments corresponded to two irrigation scheduling methods (tensiometers and class A pan evaporation) and two cropping systems (conventional and no-till). For calibration, data from the experiment carried out in 2002 were used. For testing, we used data from the experiment conducted in 2003. By using the genetic coefficients calibrated for cultivar IAC-Carioca, the model could correctly simulate phenology, leaf area, dry matter and grain yield during both, calibration and testing, under no-till and conventional systems, combined with tensiometer and class A pan irrigation scheduling methods. Conversely, the model did not show the same performance for soil moisture simulations. Univ Estadual Paulista, Jaboticabal, SP, Brazil Univ Estadual Mato Grosso Sul, Aquidauana, MS, Brazil Univ Estadual Paulista, Jaboticabal, SP, Brazil

This study aimed to establish a comparison for theoretical water demand between rice plants grown under flooding and under different levels of water stress, imposed at distinct crop stages, in terms of plant morpho-physiology and phenology. The experiment was installed in a greenhouse, using complete randomized design and factorial scheme 3 × 4 + 1, with four replications. Factor “A” was defined as the growth stage when water stress was imposed on the treatments, these stages being (1) vegetative, (2) reproductive 1, and (3) reproductive 2; factor “B” was composed of four levels of water stress (0 to 200 kPa). The additional treatment consisted of a flooded check. Water was replenished back to saturation every time the threshold stress level was reached. There is damage to rice growth and development in water tensions greater than 30 kPa when applied between tillering start and anthesis. Main damage was observed as reduced rates of culm growth; leaf area tended to be maintained. Water luxury consumption by rice plants grown under flooding seems to be about 23% of the total demand, compared to the other irrigated treatments. The rice field should be irrigated back to saturation when soil water tension is between 10 kPa and 30 kPa. Overall, theoretical crop coefficient (Kc) for rice under sprinkler irrigation is about 20% lower than that observed for the flooded check. Key words: Water consumption, planting system, Oryza sativa.

Objetivou-se, no presente trabalho, avaliar o efeito de diferentes critérios para manejo da irrigação em quatro densidades de plantio, sob sistema de gotejamento na incidência e severidade da ferrugem do cafeeiro e avaliar a influência do enfolhamento na curva de progresso dessa doença. Conduziu-se, o experimento, em área experimental da Universidade Federal de Lavras MG, utilizando a cultivar Rubi MG-1192 com seis anos. O delineamento experimental foi em blocos ao acaso com quatro repetições. Os tratamentos foram constituídos por quatro parcelas representadas pelas densidades de plantio (convencionais e adensados): 2500 (4,0x1,0 m), 3333 (3,0x1,0 m), 5000 (2,0x1,0 m), 10000 (2,0x0,5 m) plantas ha-1, quatro subparcelas sendo: irrigações quando a tensão da água no solo atingiu valores de 20 e 60kPa; irrigações utilizando o manejo do balanço hídrico (calculado através do software IRRIPLUS), com turnos de irrigação fixos de três dias por semana e uma testemunha sem irrigação, perfazendo um total de 16 tratamentos. Cada subparcela foi constituída por 10 plantas, sendo consideradas como plantas úteis as seis centrais. Foram avaliadas a incidência e severidade da ferrugem e a porcentagem de enfolhamento das plantas de cafeeiros. Após análise estatística, os dados foram convertidos em área abaixo da curva de progresso da doença e do crescimento. Verificou-se que os critérios para manejo da irrigação influenciaram a curva de progresso do crescimento, porém, não interferiu na curva de progresso da incidência e da severidade da ferrugem. Os sistemas de plantios adensados favoreceram a incidência da ferrugem. Mas as densidades de plantio não interferiram no enfolhamento. The objective of this study was to evaluate the effect of different irrigation controls implemented in four planting densities on a system of drip on the incidence and severity of rust and to assess the influence of leaf growth on the progress curve of this disease. The experiment was conducted in the experimental area of the Federal University of Lavras - MG, using the cultivar Rubi MG-1192 with 6 years. The experimental design was randomized blocks with four replicates. The treatments consisted of four tranches represented by planting densities (conventional and non-conventional): 2500 (4.0 x1.0 m), 3333 (3.0 x 1.0 m), 5000 (2.0 x 1.0 m), 10,000 (2.0 x 0.5 m) plants / ha, with four subplots: the tension when irrigation water in the soil reaches values of 20 and 60kPa; using water balance management of irrigation (calculated by the software IRRIPLUS) with rounds of irrigation fixed three days per week and a control without irrigation, making a total of 16 treatments. Each subplot line consisted of 10 plants with the six central plants considered as useful. The incidence and severity of rust and the percentage of grown of coffee plants were evaluated. After statistical analyses the data were converted to area under the curve of disease and growth progress. It was verified that the management of irrigation influenced the progress curve of growth, but it did not interfere in the progress curve of the incidence and severity of coffee rust. The dense system of plantation favored the incidence of rust. However, the planting densities did not affect growth.