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中文摘要：
通过在太湖地区两种主要水稻土（黄泥土和乌栅土）上的田间小区试验，研究了水稻在不同N水平下对N吸收变化规律、N素表观利用率以及N肥的增产效果和经济效益。研究结果表明：水稻在两种土壤上的吸N速率均在分蘖结束后到开始孕穗即孕穗期最快，施N处理的吸N速率大约在N2．2—4．2kg／（hm^2·d）。两种土壤不同施肥处理下化肥N利用率的变化范围在31．6％-46．2％之间，平均为37．6％。N肥最佳施用量黄泥土为N227kg/hm^2，乌栅土为N255kg／hm^2。
英文摘要：
A field experiment was carried out in two main paddy soils （Wushan soil, Huangni soil） in Taihu Area to study nitrogen uptake and utilization by rice, effect of nitrogen fertilizer on rice yield, and economic efficiency of N fertilization. The results indicated that the nitrogen uptake rate of rice was the highest at the booting stage, being around N2.2 - 4.2 kg/（hm^2·d）, and the nitrogen apparent utilization rate of rice was about 31.62% - 46.15%, and 37.64% on average. The recommended optimal N application rate was about N 227 kg/hm^2 in Huangni soil and 255 kg/hm^2 in Wushan soil for rice production.
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