关键词: 水稻, 水稻, 农药, 调查, 对策, 沈阳

Abstract: In order to explore the suitable sowing dates under the condition of climate change, It studied early maturing, medium-late-maturing and late-maturing varieties of relationship between different sowing dates and agronomic characters, yield. It showed that: the different sowing dates significantly affected plant height, grain weight, grain weight and yield. The early maturing varieties were the best to sowing in May 15 or so, Medium-late-maturing and late-maturing varieties were the best to sowing in May 5 or so. Accumulated temperature, rainfall and sowing was the relationship with the delayed sowing reduced. Sowing the impact on plant height with the delayed sowing decreased, sowing date on yield was the highest yield optimum sowing date, sowing early and delayed production were expressed as production. Accumulated temperature and yield, the relationship between rainfall and yields are positively correlated, but the correlation coefficient between rainfall and yield is less.