论文部分内容阅读
8个基、蘖、穗肥施氮数量与比例处理对毕粳 37号的试验结果表明 :将蘖肥提前作基肥深施比其表施效果好。以适宜施氮总量的 70 %～ 80 %作基肥深施 ,2 0 %～ 30 %视苗情作穗肥施用为最佳施氮模式 ,既能显著提高水稻单产和氮素利用率 ,又减少损失并逐步提高土壤肥力而实现稳产 ;增加施氮量不能显著提高水稻单产 ,而氮素损失却更加严重。于 1997～ 1998年利用该模式在贵州织金、纳雍、毕节三县 (市 )共示范 1985.75hm2 ,每 hm2增产稻谷 718.0 5kg,增产 9.32 %。
8 base, tillering, spike fertilizer N and the ratio of the number of treatments on the Bijing 37 test results show that: the advance of the tillering fertilizer for basal application is better than the table. Applying 70% -80% of the total amount of suitable nitrogen fertilizer for deep basal fertilizer application and 20% -30% of seedling emergence as the optimal nitrogen application mode, not only can significantly increase the rice yield and nitrogen utilization rate, Reduce losses and gradually increase soil fertility and achieve stable production; increasing the amount of nitrogen application can not significantly increase rice yield, but the nitrogen loss is even more serious. In 1997-1998, a total of 1985.75 hm2 was used in the three counties (cities of Zhijin, Nayong and Bijie) in Guizhou. The hm2 increased rice yield by 718.0 5 kg per hm2 and the yield increased by 9.32%.