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不断调整和改善施肥结构，可提高水稻单产。为研究氮肥不同运筹方法与水稻产量之间的关系，进行本试验。１材料与方法 试验于１９９７年５～１０月在青浦镇办农场实验基地进行，土种为淤泥土，土壤肥力中等，供试水稻品种“粳稻４０１７”。 ５月１５日播种，６月２０日移栽。?
Constantly adjust and improve fertilization structure, can improve rice yield. In order to study the relationship between different N application methods and rice yield, this experiment was carried out. MATERIALS AND METHODS The experiment was carried out at the farm experimental base of Qingpu Town from May to October in 1997. The soil type was silt soil and the soil fertility was medium. The tested rice variety “japonica rice 4017”. May 15 sowing, June 20 transplanting. ?