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目前蔬菜大棚生产越来越趋向于多品种、多茬次栽培,生产时间大大延长。一般一年种植两茬的大棚,早春可于3月中旬定植,秋季延续至10月中下旬采收结束。而大棚的提早定植和延后生产季节多处于我省寒潮与霜冻的多发时期,做好大棚内霜冻的预报并采取有效措施加以防御,在生产上具有重要意义。根据蔬菜的霜冻临界温度,确定适宜的幼苗定植期蔬菜幼苗的霜冻临界温度,因蔬菜的种类品种及生长状态的不同而有所差异,根据多年生产实践观察,以
At present, the production of greenhouses tends to be more and more varieties, more stubble cultivation, production time greatly extended. The general planted two stubble greenhouses, early spring planting in mid-March, autumn to mid-late October harvest. The early planting of greenhouses and delayed production season are mostly in the multiple periods of cold spell and frost in our province. It is of great significance to do a good job in forecasting frost in greenhouses and taking effective measures to prevent them. According to the frost critical temperature of vegetables, the frost critical temperature of vegetable seedlings suitable for seedling planting is determined, which is different due to the variety of vegetables and the growth state of vegetables. According to years of production practice observation,