Abstract:

In order to identify the drought occurrence regularity, the degree of influence in wheat seeding stage of Huaibei area and put forward the countermeasure to deal with, based on an analysis of the precipitation index, the grade of drought disasters index to divide the drought classification in Suzhou City. Through the sliding average method, the Huaibei area wheat seeding stage of drought occurrence frequency, basic rules and distribution were researched. The results showed that, over 2/3 of the years appears drought in seeding stage in Huaibei area, the drought in north central was heavier than the southern part in the 21 century, the drought was serious than before, from north to south the seeding stage drought was heavier than short-term drought. Since 2001, the short-term drought, medium-term drought and autumn and winter continuous arid become more serious. Through the study, the fundamental reasons of the wheat seeding stage drought was lack of precipitation, the serious drought occurring once in 5-year. Based on the effects of 2010-2011 autumn and winter continuous arid on the development of wheat, analysis of the seeding stage drought on the influence degree of wheat in different growth stages, long time of drought would lead severe late effects on yield formation, the average yield would reduced 20%. The best way to defence drought was intensive cultivation and scientific utilization of soil moisture, irrigation before winter begins is conducive to wheat tiller and root growth could safely live through the winter, lay a good foundation for wheat had a higher ears.