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在双季稻种植条件下,红黄泥稻田淹水耕地之后,土壤的NH_4-N含量急速上升,在水稻分蘖时达最高值,然后逐渐减少直至水稻成熟,2个阶段均可用幂函数式模拟;种稻期间土壤水解氮数量较稳定,平均79.8ppm,土壤供氮量及土壤氮吸收率,早稻分别为5.22kg/亩和50.8％～63.1％,晚稻分别为4.76kg/亩和52.8％～62.1％:7～8月间土壤氮矿化强度出现3次高峰,各种施肥处理的水稻吸氮过程及土壤氮矿化累积过程,可以用直线和曲线多种方程来表示。
Under the conditions of double-cropping rice, the content of NH_4-N in soil increased rapidly after flooding farmland, and reached the highest value at tillering stage, and then decreased gradually until the rice matured, which could be simulated by power function in both stages ; The amount of soil hydrolyzed nitrogen during planting was relatively stable, with an average of 79.8ppm, soil nitrogen supply and soil nitrogen uptake rate, 5.22kg / mu and 50.8% -63.1% for early rice, 4.76kg / mu and 52.8% 62.1%: The soil nitrogen mineralization intensity reaches the third peak from July to August. The nitrogen uptake process and soil nitrogen mineralization process of various fertilization treatments can be expressed by many kinds of equations of straight line and curve.