杂交水稻较常规稻具有较明显的增产优势,但如果氮肥施用过多,也会使产量不高。如1980年我区圣灯公社莲花大队种杂交水稻30亩,底肥平均亩施沼气肥30担、尿素40斤、磷肥100斤;分蘖期和拔节期共施沼气肥15担、尿素28斤、母液80斤,约折纯氮40斤,结果造成后期贪青徒长、倒伏,亩产仅 Compared with conventional rice, hybrid rice has more obvious yield increase, but if too much nitrogen fertilizer is used, the yield will not be high. For example, in 1980, a total of 30 mu of hybrid rice was planted in the lotus brigade of Shengde Commune, 30 mu of biogas fertilizer at the base fertilizer, 40 kg of urea and 100 kg of phosphate fertilizer. During the tillering and jointing periods, biogas fertilizer of 15 tons, urea of ​​28 pounds, 80 pounds, about 40 pounds of pure nitrogen, resulting in the latter part of the leniency, lodging, mu only