关键词: 积温变迁, 冬小麦, 旺长, 播期

Abstract: Based on the meteorological data of the winter of 1967-2006 in Jining City of Shandong Province,changes of the accumulated temperature during autumn and winter and their impacts on winter wheat growth were analyzed,combined with the growth and development data of winter wheat.The results indicated that since 1967,that mean accumulated temperature above 0℃,the probability of ≥700℃ and ≥800℃ accumulated temperature each ten years before wintering increased significantly.The accumulated temperature above 0℃ during the overwintering stage increased significantly,while the negative accumulated temperature during overwintering stage decreased significantly.The probability of the flourishing growth of winter wheat before wintering increased,while the degree of the flourishing growth and growth rate during overwintering stage increased as well.The sowing date for early winter wheat should be postponed to October 5th to 9th,not earlier than October 5th.The sowing date could be postponed to October 10th as in autumn it was warm,e.g.the mean temperature in the first ten days of October was with ≥18℃.For the cultivars of the spring form or half winter form the sowing date should be further postponed to October 10th to 15th to prevent the flourishing growth before wintering and freeze damage during the wintering stage.

Key words: Changes of accumulated temperature, Changes of accumulated temperature, Winter wheat, Flourishing growth, Sowing date