唐山位于冀东地区,蔬菜产业发展势头良好,尤其是2010年以来,先后实施了棚室蔬菜建设工程和设施小区建设工程,棚室蔬菜面积已达105万亩,为京津乃至全国“菜篮子”工程作出了积极的贡献。同时,蔬菜连作障碍也屡有发生。导致土壤营养失衡,菌群失衡,病虫危害加重,使蔬菜产量和品质明显下降的现象。一、连作障碍的表现1、病虫害加重。设施多年连作后,由于其土壤理化性质以及光照、温湿度、气体的变化,一些 Tangshan is located in the eastern part of Hebei Province. The vegetable industry has enjoyed a good momentum of development. In particular, since 2010, it has successively implemented the construction of greenhouse vegetables and facilities and the vegetable area in the greenhouse has reached 1.05 million mu, serving as a vegetable basket for Beijing, Tianjin and the whole country "Project made a positive contribution. At the same time, vegetable continuous cropping obstacles have also occurred frequently. Lead to imbalance of soil nutrients, flora imbalance, pests and diseases worsened, so that vegetable yield and quality decreased significantly phenomenon. First, the performance of continuous obstacles 1, pests and diseases worsened. After years of continuous operation of facilities, due to its soil physical and chemical properties and light, temperature and humidity, gas changes, some