手机尾号为5898的用户问:大棚生产应该如何防气害?专家解答:大棚栽培蔬菜,常因施肥方法不当,忽视通风换气,使棚内有毒气体过量,危害蔬菜,而又常被误诊为病害,导致歉收甚至绝收。主要气害有氮气、亚硝酸气体、乙烯和氯气。预防措施:①合理施肥。大棚内施用的有机肥必须经过发酵腐熟,化肥要优质,尿素应与过磷酸钙混施。基肥要深施20厘米,追施化肥深度要在12厘米左右,施后及时浇水。②通风换气。在晴暖天气,应结合调节温度进 Cell phone tail number 5898 users Q: greenhouse production should be how to prevent gas? Expert’s Answer: Greenhouse cultivation of vegetables, often due to inappropriate methods of fertilization, neglect ventilation, so shed poisonous gas overdose, endanger vegetables, but often misdiagnosed As a disease, leading to poor harvest or even income. The main gas hazards are nitrogen, nitrous acid gas, ethylene and chlorine. Preventive measures: ① reasonable fertilization. Organic fertilizer applied in the greenhouse must be decomposed by fermentation, fertilizer should be high quality, urea should be mixed with superphosphate. Base fertilizer to be applied 20 cm depth, topdressing fertilizer depth should be about 12 cm, Shi timely watering. ② ventilation. In sunny weather, should be combined to adjust the temperature into