Influence of Cobalt and Phosphorus on Their Uptake and Growth of Clusterbean (Cyamopsis Tetragonoloba L.)

Cobalt relationship was studied in clusterbean in pot culture using four levels each of Co and P. Application of 2 mg kg⁻¹ Co increased the green foliage and dry matter yield but 4 mg kg⁻¹ decreased it. Yield of clusterbean increased linearly with increasing levels of applied P upto 40 mg kg⁻¹. The content and uptake of Co and P in plants increased with their respective application. Increasing levels of P and Co decreased the content of each other. Application of P increased Co uptake while P uptake increased with 1 mg Co kg⁻¹ only by the crop.