杂交稻的主要栽培特点之一是分蘖优势特强,80%以上的产量靠分蘖构成。但分蘖具有两重性,早期分蘖能形成一定的穗形结构,有利于高产。后期分蘖不仅成穗率低,且穗形又小,对产量作用不大。分蘖过旺还会造成田间郁闭,恶化小气候条件,以致病虫害严重,导致减产。提高结实率是杂交水稻生产中的另一个较为重要的问题。尤其是 One of the main cultivation characteristics of hybrid rice is that the tillering is extremely strong and the yield of more than 80% is composed of tillers. However, tillers have duality, early tillers can form a certain spike-shaped structure, is conducive to high yield. Late tillering rate not only into the ear, and the panicle is small, little effect on the yield. Tillering can also cause overcrowding in the field, aggravating microclimate conditions, resulting in serious pests and diseases, resulting in reduced production. Improving seed setting rate is another important issue in hybrid rice production. especially