PHYSIOLOGICAL APPROACHES FOR DROUGHT MITIGATION IN GROUNDNUT CROP (Arachis hypogaea L.)
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Date
2015-06-30
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UNIVERSITY OF AGRICULTURAL SCIENCES, RAICHUR
Abstract
Field experiment was conducted during summer 2014-15 at Agricultural college farm, Raichur to study the effect of different stress mitigating compounds on morpho-physiological, biochemical, biophysical, yield, yield components and quality parameters in groundnut under soil moisture stress condition. Experiments were laid out in randomized block design with 12 treatments with three replications.
The morphological parameters, viz., plant height, number of leaves per plant, number of primary branches per plant, leaf area, canopy spread and dry matter production were significantly higher with the foliar application of triacontanol @ 2.0 ml/l followed by foliar spray of nitrobenzene @ 20 ppm and methanol @ 2 per cent compared to control. The foliar application of alachlor @ 20 ppm recorded significantly higher canopy temperature compared to other treatments.
Among various biochemical parameters, total chlorophyll content was found to be significantly higher in foliar application of triacontanol @ 2 ml/l followed by kaoline @ 6 per cent, nitrobenzene @ 20 ppm and methanol @ 2 per cent compared to moisture stress treatments. Whereas, proline content was significantly higher in water stress treatments compared to all other treatments. While, the NRA was found to be significantly lower in water stress treatment compared to other treatments.
The yield and yield attributes showed significantly higher values in normal irrigation. Significantly higher numbers of pods per plant were recorded with foliar application of triacontanol @ 2.0 ml/l followed by kaoline @ 6 per cent, KCl @ 1 per cent and salicylic acid @ 500 ppm as compared to other stress treatments., Significantly maximum pod yield was found with the foliar spray of triacontanol @ 2.0 ml/l followed by kaoline @ 6 per cent and nitrobenzene @ 20 ppm compared to other stress treatments.
Among different stress mitigating treatments, foliar spray of triacontanol @ 2.0 ml/l recorded higher oil and protein content followed by KCl @ 1 per cent and kaoline @ 6 per cent. Whereas lower oil and protein content was recorded by water stressed plot as compare to all other treatments.
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