寒地水稻茎蘖等穗期研究初探

Elementary Studies on Termination of Effective Tillering for Rice in Cold Region

对不同时期出生的分蘖挂牌观察表明 :因品种熟期、插植密度、秧苗素质的不同 ,分蘖出生迟早、数量及成穗率差异均较大。本田分蘖成穗率与分蘖出生于移栽后的天数呈直线负相关 ,由于分蘖成穗率下降呈连续变化 ,故茎蘖数与最后收获穗数相同时期不宜称之为有效分蘖终止期而应称为茎蘖等穗期为宜。

The investigation result showed that there are great differences in tiller number as the maturity of varieties, transplanted density and seedling quality are different. The emergence date of first tiller, tiller number and the ratio of survived spikes have great differences too. The ratio of survived tillers has negative relation to the date of tiller emergence after transplanting. Since the ratio of titlers survived will decreased continuously, the date when tiller numser is equal to the harvested spike number is not the end date of effective tiller but the spike killer equal date.