The fate of nitrogen in wheat stubble incorporated with soil or mulched on soil surface was studied by 15N tracer technique.Pot experiment in which millet was sown and harvested after 87 days was conducted at cinnamon soil Beijing Drab Soil. The results arc as follows: 1. The applied nitrogen recovery in straw and grain of millet was 28.3% and 15.2% respectively under wheat stubble mulch as compared to that of 20.6% and 12.0% by incorporation with soil. 2. After 87 days of millet grown, 28.3 % of the N of wheat stubble applied on soil surface was in millet plant, 16.5% in humus, 8.5% leached off by percolating water, 3.1% lost ny volatilization and about 51.6% remained in soil, whil 20.0% of that incorporated with coils was in millrt plant, 14.8% in humus, 0.2% leached off, 11.5% lost by volatilization and 53.1% remained in soil.
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徐新宇,张玉梅,胡济生.应用15N示踪研究麦秸还田中氮的去向[J].土壤学报,1989,26(1):64-71. Xu Xinyu, Zhang Yumei, T. S. Hu. STUDIES ON THE FATE OF NITROGEN IN WHEAT STUBBLE APPLIED ON SOIL SURFACE AND INCORPO RATED WITH SOIL[J]. Acta Pedologica Sinica,1989,26(1):64-71.