INFLUENCE OF GROWTH PROMOTING AND RETARDING COMPOUNDS ON GROWTH, DRY MATTER PRODUCTION AND YIELD IN GREENGRAM DURING RABI

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Date
2010
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ACHARYA N.G. RANGA AGRICULTURAL UNIVERSITY RAJENDRANAGAR, HYDERABAD
Abstract
An experiment was carried out to study “Influence of growth promoting and retarding compounds on growth, dry matter production and yield in greengram during rabi” at Student’s Farm, College of Agriculture, Rajendranagar, Hyderabad, on sandy loam soil during Rabi 2009-10. A field experiment was conducted in randomized block design with 9 treatments replicated thrice. The basic material for the present investigation consists of Greengram cv WGG-37 and two growth promoting (NAA and Brassinosteroid) and growth retarding substances (chlormequat chloride and mepiquat chloride). These growth regulators were sprayed at flower initiation stage. The morphological and physiological traits viz., number of branches per plant, number of trifoliates per plant and number of root nodules per plant were significantly increased by NAA @ 20 ppm, whereas plant height was significantly increased by chlormequat chloride 50% SL (187.5 a.i/ha) over control. The dry matter accumulation in leaf, stem and reproductive parts increased significantly due to the application of growth regulators. NAA (20 ppm) and brassinosteroid (20ppm) recorded significantly higher values for total dry matter production (TDM) over growth regulator treatments at all stages. The growth parameters viz., LAI, RGR, CGR, NAR, SLW and LAR increased significantly with the application of growth regulators. The biochemical parameters viz., photosynthetic rate, chlorophyll content, protein content and nitrogen harvest index were higher with chlormequat chloride. The seed yield increased significantly with NAA (20 ppm) followed by mepiquat chloride 5% AS, brassinosteroid (20 ppm), chlormequat chloride (137.5.5 a.i/ha). The results on yield and yield attributes indicated that, all the yield contributing characters viz. number of seeds per plant, number of seeds per pod, number of pod per plant, and harvest index increased due to growth regulator treatments.
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INFLUENCE, GROWTH, PROMOTING, RETARDING, COMPOUNDS, GROWTH, DRY, MATTER, PRODUCTION, YIELD, GREENGRAM, DURING, RABI
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