杂交晚稻氮肥施用技术的研究

试验结果表明,杂交晚稻在中等肥力稻田种植,亩施纯氨4.8～13.8公斤,均比不施氮的获得不同程度增产。同一施氮水平不同施肥方法增产效果不同。高氮水平“前重法”增产效果最好;“匀施法”次之;“攻中法”最差。中、低氮水平以“攻中法”和“匀施法”。增产效果较好;“前重法”较差。不同施肥方法适于不同施氮水平。杂交晚稻氮肥施用技术必须根据施氮水平,同时考虑土壤、气候条件等因素的影响,选用适当的施肥方法,才能提高氮肥的增产效率。

STUDIES ON THE TECHNIQUE OF NITROGEN FERTILIZER APPLICATION TO LATE HYBRID RICE

The technique of nitrogen fertilizer application to late hybrid rice was studied.The result showed that the yield of late hybrid rice increased in differnt degrees with the applied nitrogen fertilizer,range from 4.6 to 13.8kg N/mu.The effects of increasing yield were varied with different application methods at a same nitrogen fertilizer level.Under high nitrogen level,it was the best to apply nitrogen fertilizer in early growing stage,the second several times during whole growing period and the worst in the intermediate growing stage.Under medium or low nitrogen level,however,it was better to apply nitrogen fertilizer in the intermedi- ate growing stage or several times during whole growing period than in . the early growing stage. Therefore it was necessary to choose the proper application method according :to the application level of nitrogen fertilizer for a good yield.