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The physiological basis for yield differences between four genotypes of groundnut arachis hypogaea in response to drought i. dry matter production and water use



The physiological basis for yield differences between four genotypes of groundnut arachis hypogaea in response to drought i. dry matter production and water use



Experimental Agriculture 24(2): 191-202



Four genotypes of groundnut grown with limited irrigation in a medium depth Alfisol in Central India transpired similar total amounts of water (220-226 mm) over the season, but produced different amounts of shoot dry matter (39-490 g m-2). The extraction front of Kadiri 3 moved most rapidly down the soil profile which may have enabled it to maintain the fastest rates of transpiration when soil water depletion was greater. Tap root extension rates of Kadiri 3 in the first 32 days after sowing were also the fastest. NC Ac 17090 was more efficient than the other genotypes in extracting water immediately after irrigation from the upper 40 cm of the soil, but this had little value in determining the pattern of water availability in this experiment. Differences in the water extraction characteristics of these genotypes explain little of the variation in dry matter:water ratio, and do not account for the major variation in harvest index associated with drought.

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Accession: 006735237

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DOI: 10.1017/s0014479700015945


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