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推广杂交水稻是我国农业科学的一项重大成就,是当前提高水稻产量的有效途径之一。但现在推广的杂交组合空壳率较高(一般达25—30％,有的甚至高达50—60％),其原因大体有四:一是高、低温影响;二是恢复度影响;三是氮肥过度;四是混杂及病虫害等原因造成。特别是抽穗扬花期遇上高温低湿或低温
Popularizing hybrid rice is one of the major achievements of agricultural science in our country and is one of the effective ways to increase the yield of rice. However, the popularization rate of hybrid combinations is now at a high level (generally 25-30%, and some even as high as 50-60%). There are generally four reasons for this: firstly, the effects of high and low temperatures; secondly, the impact of restoration; thirdly, Nitrogen over; Fourth, mixed and pests and other causes. In particular, tassel flowering encountered high temperature and humidity or low temperature