%0 Journal Article
%T Minimum Application Rates for High-Yielding Rice Production System in the Taihu Lake Region as a Field Measure for Controlling N and P Agricultural Loading<br>太湖地区高产水稻土经济极点施肥:一种农田N、P养分负荷的田间控制技术
%A Pan Genxing
%A Zhu Qinghe
%A Zhang Ying
%A Li Lianqing
%A Huang Xiaomin
%A Wang Jifang
%A Jing Xueyi
%A <br>潘根兴
%A 褚清河
%A 张英
%A 李恋卿
%A 黄筱敏
%A 王吉方
%A 景学义
%J 环境科学
%D 2003
%I 
%X Excess application with the poor efficiency of fertilizers is one of the major problems confronting the sustainable agricultural development. Whereas, loss of N and P nutrients from farmlands to surface waters is considered as one of the major sources inducing eutrophication. In order to work out a minimum fertilizer application rate for both keeping conventional yield and reducing nutrient loading of non point source pollution, an experiment of formulated fertilization scheme on rice at different rates and nutrient ratios by incorporating the soil supply potential was conducted in a paddy soil Wunitu in Kunshan City, Suzhou. The soil nutrient can supply a yield at 6.75 t/hm2 at least for one cropping season. Among the fertilization treatments, a maximum yield of 9.79 t/hm2 was obtained at fertilization (N + P) rate of 300 kg/hm2kg N and P at a ratio of N to P being 3:2 or 1:1. However, with much lower fertilization (N + P) rate at 240 kg/hm2 with the same ratio a high yield of 9.69 t/hm2 was reached. The fertilizer efficiency of the later was 3 times as that of the former rate. Thus, a economical and environmentally sound mode of fertilization in such paddy soils as total N and P 240 kg/hm2, with N:P:Kratio being 3:2:0 or 1:1:0 was developed. Further study would be directed to a innovation of combination of reducing fertilization rate with rotated fertilization for alternative crops.
%K high yielding rice
%K chemical fertilization rate
%K nutrient ratio
%K non point source pollution<br>高产水稻
%K 化肥施用量
%K 养分配比
%K 非点源污染
%U http://www.alljournals.cn/get_abstract_url.aspx?pcid=3FF3ABA7486768130C3FF830376F43B398E0C97F0FF2DD53&cid=A7CA601309F5FED03C078BCE383971DC&jid=64CD0AA99DD39F69401C615B85F123EF&aid=B996A020C0491999&yid=D43C4A19B2EE3C0A&vid=B91E8C6D6FE990DB&iid=38B194292C032A66&sid=6700D0D256586E73&eid=8C83C265AD318E34&journal_id=0250-3301&journal_name=环境科学&referenced_num=13&reference_num=11