氮肥施用量对荃早优丝苗产量及其构成因素的影响

Effect of Different Nitrogen Application Rates on Rice Yield and Yield Components

以双季晚稻荃早优丝苗为材料,设置0、105、150、195、240 kg/hm^(2)5个施氮水平,研究不同氮肥施用量对水稻产量及其构成因素的影响。结果表明,随着施氮量的增加,荃早优丝苗高峰苗数、有效穗数、茎蘖成穗率、每穗总粒数和产量呈先增后减的趋势,结实率、千粒重有所降低。施纯氮150 kg/hm^(2)处理的高峰苗数、有效穗数、茎蘖成穗率、每穗总粒数和产量最高。荃早优丝苗在浙江台州地区作连晚种植时,在施足磷钾肥的条件下,纯氮施用量以150 kg/hm^(2)为宜。

This experiment was conducted by using double-cropping late rice variety called Quanzaoyousimiao to study the effects of different nitrogen application rate on rice yield and yield components under five nitrogen treatments of 0,105,150,195 and 240 kg/hm^(2).The results showed that with the increase of the amount of nitrogen,peak seeding number,number of effective ear,ear bearing tiller rate,total grains per panicle and yield increased first and then decreased,but seed-setting and grain weight decreased,and peak seeding number,number of effective ear,ear bearing tiller rate,total grains per panicle and yield were the highest under the nitrogen treatment of 150 kg/hm^(2).When the rice“Quanzaoyousimiao”was planted in Taizhou area of Zhejiang Province,the optimum nitrogen application rate was 150 kg/hm^(2) under the condition of sufficient phosphate and potash fertilizer.