氮肥运筹对双季晚稻产量和品质的影响

The effect of different proportion of nitrogen application on yield and quality of double cropping late rice

以皖稻111为材料,在施氮量为225 kg/hm2的条件下,研究不同时期氮肥施用比例对双季晚稻产量和品质的影响。结果表明:①依产量从大到小排序,前、后期氮肥施用比例依次为7∶3、6∶4、8∶2、9∶1、5∶5、10∶0、0∶0,以前期基蘖施氮量占总施氮量为70%时产量最高;②随着基蘖肥比例的降低、穗肥比例的增高,稻米加工品质提高,外观、营养品质有先升后降的趋势;前、后期氮肥施用比例为6∶4和7∶3,能较好地协调产量和品质。

The effects of different application proportion of N fertilizers on late rice yield and quality were studied using hybrid vari- eties wandao111 as materials under the condition of the total applied nitrogen amount of 225 kg/hm^2 in the whole growth stage. The results were listed as follows： ① The rice yield ranked from high to low in different proportion of nitrogen treatments was as follows： 7：3, 6：4, 8：2, 9：1, 5：5, 10：0, 0：0. When the ratio of nitrogen applied at early stage to the total nitrogen was 70% , yield was the highest; ② With the decreasing of N-application rate at latter stages, that was the application proportion at earlier and latter stages from 5：5 to 10：0, rice milling quality was improved, facial features and nutrition quality increased at first, then descended. Thus, when the proportion of N- application was 6：4 and 7：3, it was beneficial to coordinate the yield and quality.