施氮与杂交中稻再生力关系研究

A Study on Relationship between N Application and Ratooning Ability of Medium Hybrid Rice

以实验数据资料为基础，论述了施氮对杂交中稻再生稻产量及穗粒结构的影响，分析了促芽肥、壮苗肥与再生力及产量的关系，并对再生稻不同节位的成穗率和穗粒结构进行了比较，为再生稻科学施肥提供了依据。

The study has showed that N application helps to increase the effective panicles,optimize the panicle-and-grain structure and increase filled spiklets and seed setting rate, and a very significant or significant level is reached. It is also shown that the sprouting of ratooning buds mainly depends on the nutritive status of the maternal stem. Dressing for bud development(at 15 days after full heading of the first crop) which is a key measure to obtain high yields of ratooning rice is conducted for the main purpose of increasing the survival rate of the low-position axillary buds but has little bearing on the early sprouting of more dormant buds. Meanwhile, dressing for strengthening sprouts (after harvest of the first crop) which is important for increase of grain yields should net be ignored, too.