The formation of greenhouse gases and toxic precautions: ethylene and chlorine if the quality of plastic sheeting or film is poor, or to film inside the residual plastic greenhouses prices to sunlight, high temperatures in the greenhouse greenhouses project to produce ethylene and volatile chlorine and other harmful gases. When the concentration reaches a certain time, can turn yellow between the veins vegetables or margin, then white, whole plant dead serious. Often misdiagnosed as bacterial angular leaf spot, cucumber particularly serious harm. Precautions toxic greenhouse gases: rational fertilization. Canopy administered through fermentation of organic fertilizer must rot heat, fertilizer must offer high quality plastic greenhouses, urea should be applied over the mix of calcium phosphate. To basal 20 cm deep application, topdressing fertilizer to reach a depth of about 12 cm, after timely watering facilities. Ventilation. In Qingnuan weather, should be combined to adjust the temperature for ventilation, rain and snow should also be appropriate for ventilation. Construction of greenhouses, Taiyuan plastic greenhouses, Communications Technology provided by Anyang City Communications Technology Limited. Anyang City Communications Technology Co., Ltd. (www.aytlkj.com) strong, credible, in Anyang, Henan agricultural supplies industry has accumulated a large number of loyal customers. The company better work attitude and continuous improvement of innovative ideas and Communications Technology will lead you into the brilliant work together for a better future!