摘要
据观察，杂交水稻直播制种部分丘块母本存在较为严重的枝梗及颖花退化现象。造成这一现象的原因，除群体密度增加外，还与施肥（主要是氮肥）方法不当有关。采用底肥、断奶肥、分蘖肥、保花肥的分段施肥，以及４０％的速效氮作底肥，６０％为追肥的方法，可以防止颖花退化，每亩可增加颖花近５０万朵，增产潜力可达３％～５％。
The reasons of spikelet degeneration of seed parents occurring in some hybrid rice seed production plots with the seed parents in direct seeding culture were analyzed and found to be related to the unsuitable fertilizing( mainly N fertilizing)techniques. Improving fertilizing methods could prevent seed parents from spikelet degenerating and make hybrid seed yield 3%～5%higher.In the new methods, more organic fertilizers should be applied and chemical N fertilizers applied according to soil fertility and growth stages. In general, organic fertilizers and 400 kg/ha ammonium bicarbonate are applied before seeding(as base fertilizers ),53kg/ha urea at 2.1-leaf stage(as the weaning fertilizer),116 kg/ha urea at 4.5-leaf stage(as the tillering fertilizer),56 kg/ha urea at the half-emerging of the top second leaf or the leaf next to frag leaf(as the spikelet-developing fertilizer).
出处
《杂交水稻》
CSCD
北大核心
1995年第3期19-21,共3页
Hybrid Rice
关键词
杂交水稻
制种
直播
颖花退化
氮肥
施肥
hybrid rice
seed production
seed parent :direct seeding
spikelet degeneration fertilizing technique
