关键词: 产量, 产量

Abstract: To clear the climatic risk of super hybrid rice seed production in Suining County, the climate risk of this process was analyzed according to the climatic risk grade index of hybrid rice seed production by using 1:250000 topographic data and 40 years climatological data. The spatial analysis method of geographical information system was also applied in the Fine-Grid calculation and the analysis of climate risk of hybrid rice in Suining County. The results showed that: when the critical sterility temperature point was 23.0℃ or 23.5℃, the minimum risk period of fertility sensitive stage was from July 11th to July 31st and the climate risk was 2.5% and 5% respectively. The comprehensive hazard index of the flowering period in Suining County was below 2.5 from June to August, the higher seed production could be obtained when the flowering period was before 14th September. The non-risk seed production area distributed in the coastal plain of Yuan river tributary valley in mid-south when the critical sterility temperature point was 22.0℃, the safer seed production area distributed in the river vally in south-central Suining and east-northern towns like Hongyan, when the temperature was either 22.5 or 23℃, and the high risk area of seed production was in the most parts of the whole county when the temperature was 23.5℃. For the rice male sterile line which the period was 80 days from seeding to heading day, the higher seed production would be obtained if the seeding date was 4th May or 25th May when the critical sterility temperature was 22.0℃, and if the seeding date was 4th May when the temperature was 22.5℃ or 23℃, not only the higher seed production, but also the lowest climate risk for fertility conversion of male sterile line could be obtained.