【摘要】 <正> 青紫泥是上海郊区主要的水稻土类型之一,约占总面积的10—15%。这类土壤的特点是:地势比较低洼,地下水位较高,养分含量较丰富,但供肥强度较弱,以致在生产实践中常使用过量的氮肥。因此研究这类土壤的氮素矿化,预测它的供氮量,为合理施肥提供更多还原

【Abstract】 The study was carried out to verify the empirical equation Y=K[（T—T₀）D] for predicting the amount of nitrogen mineralization in soil by submerged incubation method; and in tre equation, the amount of NI₄-N released from the soil is tre function of soil effective accumulated temperature. The soil used for experiment was a gleyed paddy soil in the suburbs of Shanghai. Incubation experiment and chemical analysis in laboratory; as well as field and micro-plot experiments were conducted. The results obtained are summarized as. follows:1. Index n in the empirical equation of gleyed paddy soil can be replaced by the mean value （?）.2. constant K of nitrogen mineralization of gleyed paddy soil may be determined by alkali-hydrolyzed nitrogen value.3. Soil effective accumulated temperature （> 15℃） in the empirical equation may be replaced by air effective accumulated temperature.On this basis, a formula including the three parameters of alkali-hydrolyzed nitrogen, （?） and temperature is set up. It provides a possibility for predicting nitrogen supplying capacity of gleyed paddy soil. Field trials of early rice and late rice have demonstrated that the avarage precision of the prediction, is about 83%. It provides a sound foundation for economic and rational application of nitrogen fertilizer on the double cropping rice in gleyed paddy soil areaas更多还原