红壤稻田上氢醌施用下的节氮效应研究

Effects of Hydroquinone Application on Nitrogen Reduction in Paddy Fields of Red Soil

为明确红壤稻田氢醌配施的节氮效果,通过设置不同尿素施用量和氢醌的配比试验,测定和分析水稻的产量、产量构成和氮肥利用率。结果表明:在0.5%的氢醌配施下,早稻季不同氮肥用量之间差异不显著,晚稻季以施纯氮140~160kg/hm2处理的产量明显高于其他处理。这主要与该处理的有效穗数、每穗粒数、结实率和千粒重等均显著提高有关。进一步结合拟合方程发现,在配施0.5%的氢醌前提下,红壤稻田晚稻季最佳的施氮量为134.42~141.42kg/hm2,最高产量为8544.03kg/hm2,最大的氮肥农学效率为28.19kg/kg。

In order to clarify the effect of hydroquinone with nitrogen fertilizer in paddy field of red soil.The field experiment was carried out which included different urea rates with hydroquinone,then,the yield,yield compositionand nitrogen use efficiency of rice were determined and analyzed.The results showed that：there was no significantdifference among all treatments in early rice,but the yield was higher in application of 140～160 kg/hm～2 nitrogen fertil-izers than other treatments.This reason was mainly related to the effective panicle number per panicle,grain numberper panicle,maturing rate and 1000-grain weight.It was found that the optimum nitrogen application rate was134.42～141.42 kg/hm～2,the maximum yield was 8544.03 kg/hm～2,and the maximum nitrogen use efficiency was 28.91 kg/kg.