水稻二次枝梗颖花的灌浆程度对产量的影响  

Effect of Spikelets upon Secondary Rachis Branch on Yield of Rice

作　　者：郑福余 

机构地区：[1]黑龙江省农科院第二水稻所

出　　处：《黑龙江农业科学》1997年第4期16-18,共3页Heilongjiang Agricultural Sciences

摘　　要：以穗数型和穗重型两种类型水稻品种为材料，研究了二次颖花的数量、成粒率等。试验结果表明：不同类型水稻品种的二次颖花占总颖花的比率有明显差异，穗重型品种二次颖花多，占总颖花的７０％以上；二次颖花的成粒率受气候及管理水平影响较大；穗重型品种二次颖花占总产的６０％以上，但其成粒率和千粒重却明显低于一次颖花，所以提高二次颖花的成粒率和千粒重，可显著增产；Research on the number and setting ratio of spikelets on secondary rachis branch of rice was carried out with different varieties. The results showed that there was notable difference between rates of spikelets on secondary rachis branch to total spikelets of different types of rice varieties. Varieties with heavy spikes had more spikelets on secondary rachis branch, accounting for over 70% of total spikelets. The setting ratio of spikelets on secondary rachis branch was more subject to climate and management.The spikelets on secondary rachis branch of varieties with heavy spikes made up over 60% of total yield, but the setting ratio and thousand kernel weight of the spikelets were obviously lower than those of spikelets on first rachis branch. So, enhancing setting ratio and thousand kernel weight of the spikelets on secondary rachis branch may increase yield significantly. The application of '920'and Fujibaoguoji, two hormonelike substances, heightened the setting ratio of spikelets on secondary rachis branch remarkably.

关 键 词：水稻 二次颖花 成粒率 产量 

分 类 号：S511.01[农业科学—作物学]