comportamento do sorgo granífero em função de diferentes frações da água disponível no solo grain sorghum responses under several fractions of plant available water

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ID: 192158
1996
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Abstract
O comportamento morfológico e fisiológico das plantas de sorgo em relação à diferentes níveis de déficit hídrico tem sido caracterizado extensivamente. Entretanto, as respostas são dependentes do grau de severidade e duração do déficit. O objetivo desse experimento foi analisar o comportamento da cultura do sorgo quando submetida a diferentes frações da água disponível no solo. O experimento foi desenvolvido no ano agrícola de 1993/94, em lisímetros de drenagem, protegidos das precipitações pluviométricas através de uma cobertura móvel. A cultivar Agroceres 3001 foi submetida a quatro tratamentos de irrigação. Irrigações foram aplicadas quando a fração da água disponível (FAD), medida na profundidade do solo explorado pelo sistema radicular das plantas, atingia valores inferiores a 0,95, 0,85, 0,75, e 0,65 da FAD, com três repetições. A altura de plantas e o índice de área foliar foram semelhantes para os tratamentos de 0,75, 0,85 e 0,95 da FAD. O manejo da irrigação com a manutenção da FAD a 0,75 e 0,85 apresentaram valores semelhantes para todas as variáveis analisadas. A manutenção da FAD a 0,65 resultou em um menor crescimento das plantas de sorgo, indicando a ocorrência de déficit hídrico.
The morphological and physiological behaviour of grain sorghum plants submitted to different water deficit levels has been extensively characterized. However, plant responses are extremelly dependents of the severity and duration of lhe stress. The objective of this experiment was to evaluate the performance of sorghum crop when submitted to different irrigation management levels. This experiment was conducted during 1993/94 growing season in a set of drainage lysimeters under a rain shelter. The sorghum variety Agroceres 3001 was submitted to four irrigation treatments. Irrigations were aplyied when the fraction of plant available water (PAW) were lower than 0.95, 0.85, 0.75 and 0.65, with three replications. Plant height and leaf area index were similar for irrigation management levels at 0.95, 0.85 and 0.75 of PAW. Similar responses were observed for the variables analized when sorghum plants were submitted to 0.75 and 0.85 of PAW. A reduction in crop growth was observed in sorghum plants when irrigation was applyied to maintam PAW above 0.65.
Reference Key
peiter1996cinciacomportamento Use this key to autocite in the manuscript while using SciMatic Manuscript Manager or Thesis Manager
Authors ;Marcia Xavier Peiter;Reimar Carlesso
Journal Trials
Year 1996
DOI
10.1590/S0103-84781996000100010
URL
http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-84781996000100010
Keywords
irrigation sorghum irrigação

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