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A Field experiment was conducted during the year 2014-15 at Agriculture College Farm, Raichur to investigate the appropriate technology to overcome the ill effects of water stress on growth and development of groundnut crop. Water stress plots were treated with various stress mitigating compounds, significantly higher pod yield was recorded with application of Triacontanol @2.0 ml/l (28.3 q/ha) followed by KCl @ 2.5% (26.9 q/ha) Methanol (2 %) (26.6 q/ha). Biophysical parameters like transpiration rate were shown maximum in Triacontanol and minimum diffusive resistance was seen in same treatment. Whereas, among the stressed plot Relative Water Content (RWC) was found more in Triacontanol followed by KCl (76.6%). At 45 DAS, Finally yield deciding parameter in photosynthetic rate was showed significant differences between the treatments. Photosynthetic rate (31.87μ mol CO2 m-2 s-1) was higher in unstressed plot wherein continuous irrigation without stress. Among the different stress mitigating compounds foliar application of Triacontanol has recorded significantly higher photosynthetic rate (30.13μ mol CO2 m-2 s-1) followed by Nitrobenzene (30.03μ mol CO2 m-2 s-1) Methanol (28.33 μ mol CO2 m-2 s-1) Salicylic acid, Kaoline and lower in stressed plots. Finally the yield components No. of Pods plant-1, Pod weight (g), pod yield (q ha-1) and harvest Index(%) were studied and maximum yield was recorded in the foliar spray of Triacontanol (28.3 q ha-1) followed by KCl (26.9q ha-1) and Methanol (6%) (26.6 q ha-1).
Key words: Diffusive resistance, Groundnut, Kaoline, Pod yield, RWC. Stress mitigation, Photosynthetic rate and Transpiration rate.