Indian Grassland and Fodder Research Institute, Jhansi, Uttar Pradesh, 284003.
Present addresses: * Department of Agricultural Chemistry and Soil Sci., C.S. Azad University of Agriculture & Technology, Kanpur, Uttar Pradesh.
Sulphur application increased yields of crops in cowpea-sorghum and sorghum cowpea crop sequences. Among the difftrent sources, ammonium sulphate was superior to others (pyrite, gypsum, elemental S). The response was economically viable. The available Sin the soil after harvest of cowpea and sorghum increased with S application over their controls, being highest with highest S level (80 kg ha−1) added through elemental sulphur. However, the reduction in available S was maximum after succeeding crops over initial S status of the soil, particularly in non-Jertilized S plots under sorghum after cowpea.
S sources, forage crops, cowpea-sorghum, available S
