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二·四畦套种半夏玉米,是烟台地区东部各县一年两熟制的一种种植方式.这里的气候特点是秋季降温早,春季回暖迟,雨量大,气温低,热量少.无霜期200天左右,年日平均气温11—11.5℃,总积温为4100—4300℃,日照2600—2700小时,太阳总辐射112.4千卡/厘米~2.年降水800—900毫米,其中七、八月份占50—60%.以总积温计算,一年之内种一季有余,种两季不足;雨
It is one of the planting modes of two-cropping system in eastern counties of Yantai in the pasture season, where the climate characteristics are: early fall in autumn, late spring in warm season, large amount of rainfall, low temperature and few calories. Day or so, the annual average temperature of 11-11.5 ℃, the total accumulated temperature of 4100-4300 ℃, 2600-2700 hours of sunshine, the total solar radiation 112.4 kcal / cm ~ 2. Annual precipitation of 800-900 mm, of which in July and August accounted for 50-60% of the total accumulated temperature calculation, more than a year within one season, the lack of two seasons; rain