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西北农林科技大学:《植物营养学》课程教学资源(PPT课件讲稿,英文版)Chapter 10 Nitrogen nutrition of plant and Nitrogen fertilizers

Plant nitrogen 1.1 Uptake of N 1. N is required by plants in large amounts Most plant material contains 2-4%N and 40%C. 2. N is usually the limiting nutrient in unfertilized systems 3. Most n is taken up from the soil in the form of nht or no a small amount of NH3 can be absorbed through the leaves N2 can be used by legume plant via biological nitrogen fiXation
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