Nowadays, there are about one hundred million people in the northeast of China. They consume more than ten billion kilograms of vegetables every year. But most of vegetables are transported from the south in winter, thus a lot of manpower and money has been wasted. The main reason for the waste is that the use ratio of greenhouse is very low in the northeast. In best structure greenhouse, the difference in temperature is below 25℃if the greenhouses have not heating equipment from December to January. Nevert...
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