太湖地区黄泥土水稻适宜施氮量研究──长期定位试验

Economical Nitrogen Application in Permeable Paddy Soil in Taihu Region——A long term fertilization experiment

在长期定位试验的基础上，研究了黄泥土（太湖地区主要土壤类型）不同肥料配施土壤N供应、植株N吸收及产量之间的关系。结果表明，土壤N供应和植株N吸收、植株N吸收和产量之间呈显著正相关关系。在本试验条件下，稻季N施入161．00～241．00kg／hm^2，产量达7285～8172kg／hm^2，与该地区大面积产量基本一致；长期不施肥，能维持一定的产量；长期仅施入有机肥，不能满足水稻对N的需要，产量较低；长期不施入P、K，对产量影响不大。

Based on a long-term fertilization experiment in Huangnitu soil （a major soil type in the Taihu Lake Region）, relationships of fertilizer combination with soil nitrogen supply, plant nitrogen absorption, and rice grain yield were studied. Results showed that soil nitrogen supply was positively related to rice nitrogen absorption, as well as rice nitrogen absorption to rice grain yield. When N was applied at a rate ranging from N 161.00 - 241.00 kg/hm^2, rice grain yield was in the range of 7285 - 8172 kg/hm^2, basically the same as the yield in the farmland. When the soil was not fertilized for a long time, rice grain yield remained at a certain level. When only organic manure was applied for a long time, soil N supply fell short to meet the need of rice for growth and thus rice grain yield decreased. A long term of withholding P and K would not affect much yield of the crop.