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Yield and uptake of N and S by canola and wheat in the growth chamber as influenced by N and S supply from soil and fertilizer

Qian, P., J.J. Schoenau, K. Greer and W. Wu. 1995. In Soils and Crops Workshop Proc., pp. 453-461. Univ. Saskatchewan


A balanced soil N and S supply is imperative for crops since both nutrients are required for protein synthesis [9,11]. Sulfur fertilization is becoming a more and more important consideration with increasing rates of N application for higher yield and better quality [1,2]. This is particularly true if the crop has a high S demand, like canola. Several studies have shown that an N:S ratio of between 9 to 16 in the plant tissue is required by various crops to achieve optimum plant growth [2,3,4,7,10,11,12]. An inadequate ratio of N and S supplied by soil will lead to one nutrient, either N or S, becoming the limiting factor for plant growth [1,6,15]. The objectives of this study were: 1) to evaluate the effect of N and S fertilization on yield and uptake of N and S in the growth chamber by two major Saskatchewan crops: canola and Canadian prairie spring (CPS) wheat and 2) to determine the N:S ratio in the two crops as a function of N and S fertilization and its relationship with N and S soil supply as predicted through assessment of soil available N:S ratio.