Effect of Phosphorus and Sulphur on Growth and Productivity of Summer Cluster Bean (Cyamopsis tetragonoloba) in South Odisha

South Odisha experiences significant agricultural fallow during the summer months, primarily due to limited irrigation facilities, in this regard, gum cultivar of cluster bean was introduced to evaluate its adaptability to local agroclimatic conditions. Moreover, determining the optimal levels of phosphorus and sulphur fertilization is essential for improving its seed quality and productivity. A field experiment was conducted in randomized block design and replicated thrice. Treatments comprised of four levels of phosphorus (20, 40, 60 and 80 kg P2O5 ha-1) as one factor and three levels of sulphur (20, 40 and 60 kg S ha-1) as other factor. The experimental results revealed that the application of 80 kg P2O5 ha-1 along with 40 kg S ha-1 significantly enhanced the growth and yield attributes of clusterbean which was statistically at par with 60 kg P2O5 ha-1. However, 40 kg P2O5 ha-1 along with 40 kg S ha-1 resulted in highest net returns and benefit-cost ratio.