Effect of Different Levels and Sources of Sulphur on Grain Yield and Sulphur Uptake of Rice on Lateritic Soil of Konkan

摘要

Available sulphur content in lateritic soils of Konkan is low to medium and raged from 3.47 to 13.15 pg g with an average value of 6.9 pg g (Kolpe, 1987). Sulphur is one of the most important secondary nutrient, essential for normal growth and development of plant (Beaton and Wanger, 1985). It plays an important role in synthesis of methionine and proteins (Kumme, 1984). Wang et at. (1976) suggested that the critical level of soil sulphur is 10 mu g g. The problem of sulphur deficiency is aggravatingrecently due to increased use of non-sulphur bearing fertilizers, intensive multiple cropping system and inadequate use of bulky organic manures like FYM. Sulphur deficiency caused by reduction of SO_4 to SO_3 and SO_2 under unaerobic condition and become an important growth limiting factor for wetland rice in the developing countries of Asia and Pacific (Wang, 1976). Hence, the present investigation was undertaken with the objectives to find,out suitable source and dose of sulphur to rice for increasing the yield.