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University of Agricultural Sciences, Dharwad (2011)

Evaluation of Groundnut Genotypes for Drought Tolerance Using Line-Source Sprinkler Irrigation Technique

Vidyadhar S. Hiremath

Titre : Evaluation of Groundnut Genotypes for Drought Tolerance Using Line-Source Sprinkler Irrigation Technique

Auteur : Vidyadhar S. Hiremath

Université de soutenance : University of Agricultural Sciences, Dharwad

Grade : Master of Science (MS) in Crop Physiology 2011

Résumé
Fifteen groundnut genotypes were screened using line source sprinkler irrigation technique (LST) during post rainy season of 2010-2011. The genotypes were tested in five moisture levels. The results revealed that under severe moisture deficits (+11.70 to -43.69%), TMV-2 recorded the highest yield followed by ICGV- 91114, ICGV-07328, R-8808, GPBD-4, Dh-86 and ICGV-00351 were found to be drought tolerant based on biomass MDI, WUE and yield. The correlation studies indicated that the yield showed significant positive relationship with days to maturity (r = 0.87**) at 90 DAS, number of primary branches (r = 0.63*) at 90 DAS, leaf area (r = 0.74*) at 90 DAS, leaf area duration (r = 0.73*) between 60-90 DAS, leaf area index (r = 0.76*) between 30-60 DAS, crop growth rate (r = 0.79*) between 30-60 DAS, absolute growth rate (r = 0.92*) between 30-60 DAS and dry matter accumulation (r = 0.69*) at harvest. Similarly the biophysical parameters like relative water content (r = 0.62*) at 60 DAS, chlorophyll stability index (r = 0.73*) at 120 DAS and the biochemical parameters like nitrate reductase activity (r = 0.66*) at 90 DAS and reducing sugar (r = 0.66*) at 90 DAS. These genotypes possessed lower LA, moderate plant height, higher levels of RWC, total sugars, nitrate reductase activity, water use efficiency and chlorophyll stability index. Hence, these indices may be used either to screen or to develop drought tolerant groundnut genotypes.

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