In the scenario of diversification in agriculture, specially in West Bengal where paddy is the main crop, oilseeds and pulses figure as good alternative. However, the productivity of oilseeds and pulses are very low in the state owing to minimum or no application of nutrients. These crops are usually grown on residual moisture and nutrient leading to poor yield and poor economic return. So information on yield maximization of these crops through soil test based nutrient management and proper extension of research results to farmers are necessary to develop them as remunerative alternative to rice for the farmers in this state. The extent of mining of K and S from agricultural soils of West Bengal are very high and widespread deficiency of these nutrients are quite evident in almost all types of soils in the state. The present work proposes to explore the impact of varying levels of K and S, under optimum supply of other nutrients, on yield maximization of blackgram-mustard-groundnut cropping sequence in the alluvial soil zone of West Bengal.