不同粳稻品种在鄂中丘陵岗地的氮肥效应及差异分析

采用田间试验，比较了不同氮肥水平下两个粳稻品种“中稻1号”和“淮稻5号”在鄂中丘陵岗地单季籼稻区的产量和氮肥利用率。结果表明，施用氮肥可显著增加粳稻的产量，与不施氮处理（N0）相比，两个粳稻品种的施氮处理分别平均增产2 179 kg/hm2和3 209 kg/hm2，增产率为45.7%和53.5%。稻谷产量与氮肥施用量呈线性加平台关系，两个粳稻品种的平台产量分别为7 517 kg/hm2和10 234 kg/hm2，最适氮肥用量分别为221.0 kg/hm2和235.5 kg/hm2。与N0相比，两个粳稻品种施氮处理吸氮量平均增加58.7 kg/hm2和71.8 kg/hm2，增幅为80.9%和85.2%。当施氮量为248 kg/hm2时，“中稻1号”和“淮稻5号”的氮肥吸收利用率（NRE）、氮肥农学利用率（NAE）、氮肥贡献率（NCR）及氮肥偏生产力（PFPN）分别为29.4%和37.6%、10.6 kg/kg和18.0 kg/kg、35.4%和42.6%及29.8 kg/kg和42.3 kg/kg。综合分析认为“淮稻5号”在鄂中丘陵籼稻区种植，可以获得更高的产量及氮肥利用率。

Effects of Nitrogen Fertilizer on Different Japonica Rice Varieties Planted in the Hilly Land of Central Hubei Province

A field trial was conducted in Dangyang City to compare the yield and nitrogen (N) use efficiency of 2 japonica rice varieties (Zhongdao 1 and Huaidao 5) in the hilly land of central Hubei Province (single\|cropping indica rice area) under different N levels. The results showed that the grain yield of the treatments with N were increased averagely by 2 179 kg/hm2 and 3 209 kg/hm2, and the increase rates were 45.6% and 53.5%, respectively. Linear and platform correlations had been shown between yield and N fertilizer amount. The platform yields of “Zhongdao 1” and “Huaidao 5” were 7 517 kg/hm2 and 10 234 kg/hm2, respectively. The most suitable N application amount were 221.0 kg/hm2 and 235.5 kg/hm2, respectively. Compared with N0 treatment, the N uptakes by these 2 japonica rice varieties were averagely increased 58.7 kg/hm2 and 71.8 kg/hm2, and the increase rates were 80.9% and 85.2%. When the N application amount was 248 kg/hm2, the N recovery efficiency (NRE), N agronomic efficiency (NAE), N contribution rate (NCR) and partial factor productivity of applied N (PFPN) of the 2 varieties were 29.4% and 37.6%, 10.6 kg/kg and 18.0 kg/kg, 35.4% and 42.6%, 29.8 kg/kg and 42.3 kg/kg. The result of comprehensive analysis believed that “Huaidao 5” could get a higher yield and high N use efficiency when planted in the hilly land of central Hubei Province.