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Drought response of grain legumes under irrigation gradient 2. plant water status and canopy temperature



Drought response of grain legumes under irrigation gradient 2. plant water status and canopy temperature



Agronomy Journal 76(4): 553-557



A great need exists, in semiarid or tropical areas, to include food legumes in rice (Oryza sativa L.) based cropping systems during the post monsoon or dry season. The seed of these legumes provide needed protein for the prevalent high starch diets. Mungbean (Vigna radiata L.), cowpea (V. unguiculata L.), soybean (Glycine max L.) and peanut (Arachis hypogaea L.) are 4 short-season legumes receiving attention. Their drought responses were compared on a medium-deep Tropudalf soil by using a line-source sprinkler irrigation system. Findings on plant water status and canopy temperature and their relationships to yield are presented. Plant water status was determined with a pressure chamber, and canopy temperature, with an IR thermometer. Plants exhibited leaf water potentials between 1300-1400 h of -1.20 MPa [megapascal] in mungbean, -1.40 MPa in cowpea, -1.41 MPa in soybean and -0.67 MPa in peanut in the dry regimes 60 days after emergence. Seasonal leaf water potential was closely related to canopy temperature in all 4 legumes. Increasing water stress decreased leaf water potential and increased canopy-air temperature differences (.DELTA.T). The seasonal cumulative leaf water potential and .DELTA.T during crop growth were negatively correlated with yield, and may be useful for selecting crop species for drought prone areas. Peanut had a higher leaf water potential and maintained a lower canopy temperature than the other species.

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Accession: 005196016

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