杂交中稻生育特性对再生芽发育和再生稻产量的影响

选用5个适合再生稻种植的杂交中稻组合，研究主季生育特性对再生芽发育的影响。结果表明：主季生育后期的光合生产能力和根系活力对再生芽的发育有明显影响。灌浆期间叶面积指数下降缓慢，乳熟期后茎鞘干物质再积累量高的组合再生芽发育快。茎倒1、2节位伤流量与再生芽发育显著相关．乳熟期和成熟期相关系数分别为0．78^＊＊和0．67^＊。再生季有效穗数与主季成穗率相关。

Effects of Growth Characters of Mid-season Hybrid Rice on Growth and Development of Ratooning Buds and Yield of Ratooning Rice

Five hybrid rice combinations which are suitable for ratooning rice farming were used to study the effects of growth characters of the main rice on growth and development of ratooning buds. The result showed that the photosynthetic capability and root activity of the main rice in its later growth stage had significant effects on the development of ratooning buds. The growth and development of the ratooning buds of the combinations with slow decreasing speed of LAI during the filling period and high dry matter accumulation in culm and sheath after the milky stage were quick. The culm - bleeding - intensity of the first and two nodes to top had close correlations with the growth and development of ratooning buds, the correlative coefficients during the milky stage and mature stage were 0.78 and 0.67 respectively. And the amount of panicles of ratooning rice also had a correlation with earbearing tiller percentage of the main rice.