两系杂交稻“两优培九”在南宁的生态适应性研究

Studies on Ecological Adaptability of Two-line Hybrid Rice "Liang-you-pei-jiu" in Nanning

近年来两系杂交稻"两优培九"在华南地区推广种植面积较大,为探讨其作为双季连作稻在广西乃至华南地区种植的适应情况,在南宁对其进行了双季连作稻的生态适应性研究及分析。结果表明,"两优培九"全生育期偏长,在早晚稻连作模式下,生长季节明显不够而表现为生长不足,在晚造易受不良天气影响出现早衰,不宜作双季连作稻种植;在早造表现分蘖力强,穗大粒多,结实率高,抗倒伏,在生育后期保持较高的叶面积指数值,具有较大的高产潜力,建议作为双季早造种植,并应比其它品种提前播种,避免影响下一造耕作。

Two-line hybrid rice, ＂Liang-you-pei-jiu＂ was planted in a large area in South China in recent years. This paper discussed the ecological adaptability of ＂Liang-you-pei-jiu＂ as double-croping rice in Nanning in order to study its adaptability in Guangxi and even the South China. The results showed that the whole growth period of Liang-you-pei-jiu was too long. It displayed hypotrophy for obvious insufficiency of growing season in the pattern of double-cropping rice. It appeared presenility as late rice for easily influenced by bad weather. So it was not suitable to plant as double-cropping rice, hut was suitable as early rice with strong tillering ability, big panicle with more grains, high seed setting rate, lodging resistance, retaining higher leaf area index in later growth period and higher yield potential. It is recomended that ＂Liang-you- pei-jiu＂ should be planted as double-cropping early rice, and should be sowed earlier than other varieties to avoid affecting the cultivation of the late rice.