小麦的最适生长温度是 1 5～ 2 5℃ ,在高温下生产力会下降。而我国北方地区冬小麦开花后常常出现日温 30℃以上的天气 ,如果伴以阵风 ,则形成干热风 ,使小麦产量下降 3.5 %～7.1 % ,严重的地区和年份减产可达 1 0 %～ 2 0 %。灌浆期高温也造成品质下降。多年统计资料表明 ,我 Wheat optimum growth temperature is 15 ~ 25 ℃, at high temperatures productivity will decline. Winter wheat in the northern part of our country often has a daily sunshine temperature above 30 ℃ after flowering. If it is accompanied by gusts, dry wind will be formed, which will reduce wheat yield by 3.5% -7.1% and severe area and year by 10% -2 0%. The high temperature during grain filling also causes the quality to drop. Years of statistics show that I