A field experiment was conducted during the season kharif 2008 and 2009 to find out response of cluster bean varieties to growth regulators. RGC-936 recorded in significantly higher amount of total nitrogen (N), phosphorus (P) uptake and protein content during both the years over RGC-1017, RGC-1003 and RGC-1002. Seed + foliar application with thiourea @ 500 ppm recorded maximum total N and P uptake. Quality parameters viz. gum and protein in seed, were found highest in cultivar RGC 1017 which was at par with RGC-1002 and RGC-1003 and all these three varieties were significantly superior over RGC 936. Variety RGC-1017 recorded 15.3% higher gum content over RGC-936. Among the growth regulators. maximum gum content in seed were recorded with the seed + foliar application of thiourea @ 500 ppm. However, it was found statistically at par with the seed + foliar application of TGA @ 100 ppm and significantly superior to rest of the treatments in current study.Key words: Clusterbean, Cultivars, Nutrient content, Quality, TGA, Thiourea, Uptake.
INTRODUCTIONGuar (cluster bean) is generally grown in India as fodder, feed, food and cover crops mainly in complex, diverse, risky and under-invested rainfed (arid and semi-arid) regions. However, in recent past a vast range of value added products or derivatives appeared in the market with more than one lakh patents globally and, thus, guar has now become an important commercial crop of Rajasthan, Haryana and Gujarat. India contributes about 80% to global guar seed production. Guar gum is extracted from the seed and its derivatives have very unique properties of solubility over wide range of temperatures, as hydrocolloid, emulsifier, thickener, stabilizer, coating/filming agent, binder, thyrotrophic, non-ionic, cross-linking, gelling, preservation, non-calorific fibrous food etc. Guar gum and its derivatives are critical ingredients in about 100 products or processes in 21 sectors of food, petroleum/gas exploration, explosives, pharmaceuticals, cosmetics, paper industry, textile, paints/ distempers, and aerial firefighting etc. Rajasthan alone contributes to 83% area and 65% to the production in India.