为了提高棚室利用率，唐山市开平区棚农改变反季“空棚”的习惯，棚室效益明显提高，一般亩收入超万元。其主要蔬菜三种三收茬口优化模式为：一、冬春茬番茄─—夏黄瓜─—秋白菜一茬冬春番茄。10月上旬播种，12月上旬定植，第二年2月采收，3月底扭秧；第二茬夏黄瓜，3月上旬育 In order to improve the utilization of greenhouses, shed farmers in Kaiping District, Tangshan, changed the habit of anti-season “canopy”, and the efficiency of greenhouses obviously improved. The average mu income exceeded 10,000 yuan. The main three vegetable three crop rotation optimization mode: First, the winter and spring tomato ─ ─ summer cucumber ─ ─ autumn cabbage crop of winter and spring tomatoes. Sowing in early October, planting in early December, harvesting in February of the second year and twisting seedling at the end of March; second cucumber in summer and breeding in early March