DETERMINATION OF SHORT TERM DROUGHT STRESS EFFECT ON YIELD AND PHYSIOLOGICAL PARAMETER IN COTTON BY WSSIS. Mandhania, O. Sangwan, R.S. Sangwan, S. S. Siwach, S.R. Pundir, S. Nimbal, Ashish Jain and Arun JanuAbstract The experiment was conducted to determine the effect of short duartion droght stress at the boll development stage with the help of WSSI on physiological and yield parameters in cotton and to screen the drought tolerant genotypes. This study was carried out with seventeen genotypes under two irrigation treatments, One has no irrigations (water stress) totally dependent on rain fall and other has four irrigations (nonstress) in addition to rainfall. Analysis of variance revealed significant genotypic differences for WSSI for all the traits. Non-significant interaction between irrigations and genotypes for seed cotton yield and dry matter exhibited varietals stability over irrigation regimes. Overall, genotypes mean performance for all the traits in stress conditions was poor as compared to non-stress conditions, nevertheless some genotypes exhibited non-significant mean differences in both irrigation regimes, thus showing higher stress tolerance. The WSSI values of seed cotton yield, plant height, dry matter and boll weight revealed that genotypes H 1465 and H 1472 were highly stress tolerant, Whereas, H 1439, H 1454, H 1467 and H 1474 genotypes were highly susceptible. Significant negative correlations between water stress and WSSI for boll weight and plant height revealed that short duration stress affect more boll weight as comapred to yield
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