Responses of groundnut genotypes to drought
1986
Williams, J.H. | Rao, R.C.N. | Matthews, R. | Harris, D.
Drought-stress effects on groundnuts depend primarily on the stress pattern because genotypic variation is usually of secondary significance. The differential responses of groundnut cultivars to drought are therefore assessed relative to the mean response of all genotypes to drought. S2048ince three major aspects of drought, (i.e. duration, intensity, and timing relative to crop phenophases) may vary independently, the main effects of these components on groundnut are described. The timing of drought has a large impact on the variation about the mean response. In general, the sensitivity of a genotype to drought increases with yield potential, increasing the closer the drought ends to final harvest. Genotypic variation in response to drought exists in the water-use ratio (WUR) of genotypes, with some being able to accumulate up to 30% more shoot dry matter than others with the same total transpiration. Variations also exist in the proportion of this dry matter that is used for pod growth. Large variations in the response of genotypes to midseason droughts are due to recovery differences after the drought is relieved. In addition, a three-factor interaction of genotype, gypsum, and drought exists because the gypsum may increase early pod development, thus providing escape eff
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