Effect of long term application of nitrogen and sulphur nutrition on nitrogen assimilation in Soybean

Abstract

Nitrogen and sulphur are assimilated primarily into protein and they occur in a molar ratio of about 20:1 in most plants. A product of nitrogen metabolism is considered to be a limiting factor for sulphate assimilation. Studies on the interaction of N and S release can yield useful information especially in oil seed crops. The ratio of total N to total S in the plant indicates the relative requirement of these nutrients. The central role of N and S in protein synthesis makes it necessary to visualize relation between N- and S-metabolism. The most important constraints to crop growth are those caused by the shortage of plant nutrients. Sulphur (S) requirement of plants has become increasingly importance in India as well as world agriculture. However, to achieve high yields and rates of S fertilizer should be recommended on the basis of available soil S and crop requirement.