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对在不同肥料结构条件下，双季稻田中随水流输入和输出的养分数量进行研究。结果表明：水流中养分的输出多于输入，其亏损趋势是钾＞氮＞磷；早稻期间养分输出多于晚稻，外排水是造成早稻期间养分亏损的主要原因；施用绿肥和稻草还田能显著减少氮素的输出，从而起到保氮作用。
Under different fertilizer structure conditions, double cropping paddy fields with the input and output of nutrients to study the amount. The results showed that the nutrients in the water flow were more than the input, and the loss trend was potassium> nitrogen> phosphorus. During the early rice period, the nutrient output was more than that of the late rice, while the external drainage was the main reason of the nutrient loss during the early rice period. Reduce nitrogen output, thus play a role in nitrogen retention.