几个晚稻品种对不同施氮量的响应差异

Difference in Response of Several Late Rice Varieties to Different Nitrogen Application Rate

通过大田试验研究了8个晚稻品种产量及其构成因素对不同施氮量(0、90、180、270 kg/hm2)的响应差异。结果表明,(1)该项试验条件下,水稻有效穗数、结实率、穗实粒数与产量关系密切,而千粒重与穗总粒数对产量影响较小;(2)从不同施氮处理间产量变化幅度看,湘丰优103对氮肥最敏感,其次是农香18,丰源优299和深优9586最不敏感;(3)各品种各产量构成因素对施氮量的响应具有明显差异,综合来看,产量构成因素对施氮量敏感性较强的品种是中9A/R9963、湘丰优103和农香18;(4)施氮使各品种产量提高,但各品种最高产量出现在不同施氮量条件下,湘丰优103、中优288在施氮量90 kg/hm2条件下产量最高,丰源优299、农香18、中9A/R9963在施氮量180 kg/hm2条件下产量最高,岳优6135、深优9586、中9A/R10402在施氮量270 kg/hm2条件下产量最高。可见品种间耐肥性具有明显差异,为获得高产,不同品种宜采用不同施氮量。

A field experiment was conducted to study the difference in yield and its components of 8 late rice varieties at different nitrogen application rates(0,90,180 or 270 kg / hm2).The results show that(1) effective panicle,seed setting rate and filled grain per panicle were closely related to yield,while 1000-grain weight and total grain per panicle had little effect on the yield in this study;(2) viewed from the yield change range among different nitrogen treatments,Xiangfengyou 103 was most sensitive to nitrogen,followed by Nongxiang 18,while Fengyuanyou 299 and Shenyou 9586 were most insensitive;(3) the response of different yield components of different varieties to nitrogen rate was clearly different,and the response of yield components of Zhong 9A/R9963,Xiangfengyou 103 and Nongxiang 18 was stronger to the nitrogen rate;and(4) the yield of all the varieties was increased by nitrogen application,but the highest yield of different varieties appeared at different nitrogen rates,the highest yield of Xiangfengyou 103 or Zhongyou 288 was achieved at N 90kg/hm2,that of Fengyuanyou 299,Nongxiang 18 or Zhong 9A/R9963 was done at N 180kg/hm2,and that of Yueyou 6135,Shenyou 9586 or Zhong9A/R10402 was done at N 270 kg/hm2.So the fertilizer-tolerance in rice varieties was obviously different,and different varieties need different nitrogen application rates for higher yield.