Urea- 15 N ( 15 NU) transformation in the organic nitrogen fractions and their relationships in paddy soil of mono-rice based cropping system The simple correlation analysis showed that residual 15 NU was extremely significant and positively correlated with amino sugar nitrogen- 15 N (ASN- 15 N) and acid hydrolysable ammonia nitrogen- 15 N (AHAN- 15 N) in paddy soil at tillering stage (Table 5 ).
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The role of Chinese Milk Vetch as cover crop in complex soil nitrogen dynamics in rice rotation system of South China.
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