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巢湖地区水稻氮肥利用率和最大经济效益施氮量的研究
晏娟,方舒,杨绳岩,梁华金
0
(巢湖学院化学化工与生命科学学院,合肥 238000;合肥市农业科学研究院,合肥 238014)
摘要:
田间条件下, 对皖稻52和宁粳3号在不同施氮水平 (0、60、120、180、240和300 kg·hm-2)下的产量、氮素吸收、累积及利用率进行研究。结果表明,施氮量超过180 kg·hm-2后, 水稻产量增加较少,超过240 kg·hm-2,水稻产量开始下降。当施氮量从60 kg·hm-2增加到300 kg·hm-2, 皖稻52和宁粳3号的氮肥表观利用率(REN)分别为75.1%~49.4%和62.1%~50.2%;氮肥农学利用率(AEN)也随施氮量的增加而显著下降,为17.3~7.33 kg·kg-1和16.8~8.64 kg·kg-1。通过拟合水稻产量、经济效益与施氮量的回归方程计算,水稻皖稻52和宁粳3号的最大经济效益施氮量分别为178 kg·hm-2和190 kg·hm-2。此时, 水稻可维持较高的产量和保持较高的氮肥利用率。
关键词:  施氮量  水稻  氮肥利用率  最大经济效益施氮量
DOI:
基金项目:安徽省高等学校省级自然科学研究项目(KJ2012Z270)和巢湖学院博士科研启动基金项目共同资助。
Nitrogen use efficiency and optimal N application rate of rice in Chaohu Lake region
YAN Juan,FANG Shu,YANG Shenyan,LIANG Huajin
(Department of Chemistry Engineer and Life Sciences, Chaohu University, Hefei 238000;Institute of Agricultural Sciences of Hefei City, Hefei 238014)
Abstract:
A field experiment with six N rate treatments,i.e.0, 60, 120, 180, 240 and 300 kg/hm2 was conducted to study effects of N application rate on crop yield, uptake, accumulation, and use efficiency of N by rice cultivar Wandao 52 and Ningjing 3. The result showed the rice yield response to added N was very low when the N application rate exceeded 180 kg·hm-2, and the rice production began to decline when the N application rate was more than 240 kg·hm-2. When N application rate increased from 60 up to 300 kg·hm-2, the nitrogen apparent recovery efficiency (REN) declined from 75.1% to 49.4% for Wandao 52, and from 62.1% to 50.2% for Ningjing 3, and the corresponding nitrogen agronomy efficiency (AEN) was 17.3-7.33 kg·kg-1 and 16.8-8.64 kg·kg-1 for Wandao 52 and Ningjing 3, respectively. The experiment results suggest that the optimal N application rate is 178 and 190 kg·hm-2 for Wandao 52 and Ningjing 3, respectively, to maintain a better grain yield and a better nitrogen use efficiency.
Key words:  N application rate  rice  N use efficiency  the optimal N application rate

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