摘要
连作晚稻田中的秋籼,对连晚直播粳稻的产量影响很大。含籼1%减产2.5%,但未达显著标点;含籼5%减产17.0%;含籼10%减产22.1%;含籼超过15%减产32.6%以上,均达到极显著标点。所以,连晚直播稻的含籼率临界值为1%。减产的主要原因是有效穗和每穗实粒锐减。
Autumn indica rice greatly affected yields of directseeded late japonica rice. A 2. 5% yield loss was investigated in fields containing 1% indica rice and showed no difference at 5% significant level comparing with the yield in a field of no indica rice. However 1% level significant yield losses showed when indica rice content in direct seeded late rice fields reached at 5% and over.And the yield losses at different indica rice content were investigated as follows: 17% yield loss at 5% indica rice content; 22.1% yield loss at 10% indica rice content; More than 32. 6% yield losses at 15% indica rice content or over. Therefore,the critical value for indica rice content in direct seeded late rice fields is 1%. Main causes of yield loss are decreasing of effective panicles and number of filled grains per pnicle.
出处
《浙江万里学院学报》
1999年第3期25-27,共3页
Journal of Zhejiang Wanli University
关键词
含籼率
晚稻
秋籼
连晚直播稻
autumn indica rice
indica rice content
direct seeded rice
yield