北方淹育水稻土中残留有机氮组分的研究田秀萍，向春阳，于连波（黑龙江八一农垦大学农学系密山１５８３０８）土壤有机氮的矿化是土壤有效氮素的主要来源。试验证明，大田水稻植株吸收的氮，大部分来自土壤的矿化氮，来自肥料的氮素仅占１／４～ｌ／２。因此，研究土壤有... Study on Residual Organic Nitrogen Components in Submerged Paddy Soil in North China TIAN Xiu-ping, XIANG Chun-yang, YU Lian-bo (Mineralization of soil organic nitrogen is the main source of soil available nitrogen in the area of ​​mineralization in Heilongjiang August First Land Reclamation University, Mishan 158308). Experiments show that most of the nitrogen absorbed by the rice plants in the Daejeon field comes from the mineralized nitrogen in the soil, and the nitrogen from the fertilizer accounts for only 1 / 4-1 / 2. So, researching soil has ...