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近年来我省玉米播种面积达2500万亩左右,占秋粮总产的42%.其中以夏玉米为主,占播种面积的4/5.但由于气候年型的不同和种植制度的发展,夏玉米的播期应当慎重安排.因为前后茬矛盾比较突出;秋季降温快,容易造成低温危害,影响灌浆和正常成熟.低温对作物的危害不像冻害症状那样突出,容易被人所觉察,被称为“哑巴之灾”.大量试验证明,早播是争取夏玉米高产的重要环节之一、但是,由于前茬多为小麦,夏玉米的播期最早在6月上旬.实际上,随着气候年型的不同,小麦的成熟期有时可拖到6月10日前后,再加上三夏大忙,劳畜力紧张,夏玉米往往拖到6月中旬,一部分拖到6月底,个别拖到7月初.严重地影响了夏玉米的产量.因此,有必要从气候角度进行分析,探讨各种气候年型下夏玉米
In recent years, corn planting area in our province reached about 25000000 acres, accounting for 42% of autumn grain total production, of which the main summer maize, accounting for 4/5 of the sown area.But due to the different climate types and planting system development, summer Corn sowing date should be carefully arranged because of inconsistencies before and after stubble more prominent; fall faster, likely to cause low-temperature damage, affecting the filling and normal maturity. Low temperature damage to the crop is not as prominent as frozen frost symptoms, easy to be perceived as For the “dumb catastrophe.” A large number of experiments show that early sowing is one of the important links for high yield of summer maize, but because the former crop mostly wheat, maize sowing the earliest in early June .In fact, with Different climatic years, wheat maturity can sometimes be dragged around June 10, plus three summer busy, labor shortage, summer maize often dragged to mid-June, part of the delay until the end of June, individually dragged Early July, seriously affected the yield of summer maize.Therefore, it is necessary to analyze from the climate point of view, to discuss the climate of the next summer maize