用１５Ｎ标记有机肥配施硫铵进行水稻盆栽试验。结果表明，单施化肥改为有机无机配施才能得到肥料氮净残留，残留的肥料氮以有机肥氮为主体。对低肥力土施用低Ｃ／Ｎ比值绿肥的平衡效果最佳，而利用高Ｃ／Ｎ比值草类，必须配合半量以上的无机肥氮。高肥土因高产多耗而易致土壤氮亏损，但可安全有效地施用各种各样有机无机肥配施组合，当季收到降低氮素亏损的效果 With 15N labeled organic fertilizer with ammonium sulfate for rice pot experiments. The results showed that the single application of chemical fertilizers to organic and inorganic fertilizer in order to get net nitrogen fertilizer residues, residual nitrogen fertilizer to organic nitrogen as the main body. On the low fertility soil, the application of low C / N ratio of green manure has the best balance effect. However, the use of high C / N ratio of grass, must be combined with more than half the amount of inorganic nitrogen. Due to the high yield and high consumption, high-fat soil is prone to lead to loss of soil nitrogen, but a variety of organic and inorganic fertilizers can be safely and effectively applied and combined, and the season receives the effect of reducing nitrogen loss