论文部分内容阅读
随着庭院保护地蔬菜生产的迅速发展,近年来发现温室及大棚内的有害气体增加,既影响蔬菜的生长发育,又危害人体健康。常见的有害气体有如下几种:1.氨气和亚硝酸气体:由于大棚内密闭、高温,一次施入过多的尿素、硫酸铵等氮肥,在短时间内就可能分解产生大量的氨气。当棚内氨的含量达到5ppm时,蔬菜的叶片便会出现水漫状斑点,然后渐变褐色,易枯死。如果此种情况发生在施肥后10—15天,则是亚硝酸气体所致。
With the rapid development of vegetable production in the courtyard protected areas, it has been found that the increase of harmful gases in greenhouses and greenhouses in recent years not only affects the growth and development of vegetables, but also endangers human health. Common harmful gases are as follows: 1. Ammonia and nitrous gases: As a result of confined greenhouses, high temperature, once applied to excessive urea, ammonium sulfate and other nitrogen fertilizers, in a short time it may decompose to produce a large amount of ammonia . When the shed ammonia content reached 5ppm, the leaves of vegetables will appear diffuse water spots, and then gradually brown, easy to die. If this happens 10-15 days after fertilization, it is caused by nitrous acid gas.