大棚内有害气体主要有三种:一是肥料分解产生的氨气和亚硝酸气;二是升温时产生的一氧化碳和二氧化碳;三是塑料本身散发的有毒气体如磷苯二甲酸二异丁酯等。产生的主要原因是:大棚内一次施入较多的氮肥,如尿素、硫酸铵、人粪尿等,特别在干施情况下,短期内最易分解大量氨气,加 Greenhouse harmful gases are mainly three kinds: First, decomposition of fertilizers generated ammonia and nitrous acid gas; Second, carbon monoxide and carbon dioxide generated during heating; Third, the plastic itself emits toxic gases such as Phthalic Dibutyl Terephthalate. The main reason is: a large amount of nitrogen fertilizer applied in the greenhouse, such as urea, ammonium sulfate, human excrement, etc., especially in dry conditions, the most easy to break down a large number of ammonia in the short term, plus