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在苏勤泥土稻区研究不同施氮量(纯N0、150.08、225.11、300.15、375.19、450.23 kg/hm2)对水稻农艺性状和产量的影响,并对不同施氮量的经济效益进行分析。结果表明:磷钾肥相同条件下,在一定的施氮范围内,随着氮肥用量的增加,水稻农艺性状及产量呈上升趋势,主要表现有效穗数、穗长、每穗粒数的增加,7个处理中以施纯氮375.19 kg/hm2处理产量和经济效益最高,平均达9 391.28 kg/hm2和5 680.37元/hm2,当施氮量超过375.19 kg/hm2时,水稻产量和经济效益不增反减。
The effects of different N rates (pure N0,150.08,225.11,300.15,375.19,450.23 kg / hm2) on the agronomic characters and yield of rice were studied in Suqian soilless rice area, and the economic benefits of different N rates were analyzed. The results showed that under the same conditions of phosphorus and potassium fertilizers, the agronomic traits and yield of rice increased with the increase of nitrogen application rate in a certain range of nitrogen application, mainly including the effective panicle number, spike length and grains per spike.7 The results showed that the yield and economic benefits of treatment with 375.19 kg / hm2 of pure nitrogen were the highest, with an average of 9 391.28 kg / hm2 and 5680.37 yuan / hm2, respectively. When the nitrogen application rate exceeded 375.19 kg / hm2, Subtract.