1 几种自然干燥方法与脱水效果根据多年实践,我们把玉米果穗干燥期划定为9月20日～10月20日。在9月下旬气温较高,一般在10℃上下,空气湿度中等,空气流速较大,果穗脱水速度快;10月上旬气温稍有降低,但日平均气温仍在5～7℃,相对湿度变小,风力增大,有利果穗脱水;10月中旬气温继续下降,但相对湿度较小,风速增大,仍有利于果穗干燥;10月下旬后,气温下降较快,开始进入稳定冷冻期,果穗脱水极为缓慢且易遭冻害。见表1 1 Several natural drying methods and dehydration effect According to many years of practice, we set corn ear drying period from September 20 to October 20. In late September, the temperature was higher, generally at 10 ℃, with moderate air humidity and large air velocity. The dehydration rate of ear was fast. The temperature dropped slightly in early October, but the average daily temperature was still 5 ~ 7 ℃. The relative humidity Small, wind power, beneficial ear dehydration; mid-October temperatures continue to decline, but the relative humidity is small, the wind speed increases, is still conducive to ear drying; late October, the temperature dropped rapidly, began to enter the stable freezing period, ear Dehydration is extremely slow and vulnerable to frost damage. See Table 1