Effect of growth retardants on morpho-physiological parameters in cotton under irrigated conditions in cotton - wheat system
2009
Singh, D. | Pandey, R. | Kumar, V.
Growth retardant spray (pix and cycocel @ 50 and 100 ppm) on two cotton genotypes reduced the vegetative growth leaf area (20-25 %) and p1ant height (9-17 %) whereas it increased the reproductive growth i.e. boll weight (5-16%), harvest index (8-12%) and seed-cotton yield (4-9%). The net returns of cotton-wheat system increased by 6%. Two sprays at 90 and 120 DAS in cotton reduced the vegetative growth, yield attributes and seed-cotton yield resulting in less net returns (12% reduction) as compared to one spray. Seed-cotton yield, boll weight and harvest index of LHH 144 were significantly higher (4.5%, 15.8% and 17%, respectively) as compared to F 1861. Growth retardants increased the specific leaf weight (70-80%) resulting in higher leaf chlorophyll content (29-69%). This led to higher photosynthesis (20-22 %), photosynthetic radiation use efficiency (22 %) and photosynthetic water use efficiency (15.32 %). It is revealed that application of pix (50 ppm) in cotton at 90 DAS is useful in controlling excessive vegetative growth and enhancing the yield of cotton under irrigated conditions.
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