EVALUATION OF SUGARCANE HYBRID VARIETIES UNDER WATER STRESS CONDITIONS

摘要

Ten promising sugarcane varieties namely CoSe 92423, CoSe 93232, CoSe 94423, CoS 95222, CoS 95270, CoS 96258, CoS 96268, CoS 97264, UP 9529 and UP 9530 were evaluated for drought tolerance under normal and deficient moisture conditions at the farm of U.P. Council of Sugarcane Research, Shahjahanpur during 2000-01 to 2002-03. The results revealed that the physiological and biochemical parameters like rate of transpiration (Tr) and stomatal diffusive resistance (Sdr) varied significantly due to moisture stress. Higher total chlorophyll and lower transpiration rate alongwith maximum stomatal diffusive resistance in varieties CoSe 92423, CoS 95222, CoS 97264 and UP 9530 under deficient water condition gave an indication of their drought endurance capacity. All the varieties showed significant reduction in growth, yield and quality under deficient irrigation (two irrigations) as compared to normal irrigation (5 irrigations). However, CoSe 92423, CoS 95222, CoS 97264 and UP 9530 produced higher shoot population, millable canes and cane yield (above 70 mt/ ha) under water stress conditions alongwith least yield reduction (below 10 per cent) indicating their drought tolerant character. Sucrose per cent in juice was significantly lower under moisture stress which also varied significantly with the varieties.