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磷化氢环流是一个复杂的过程,既要掌握有效的浓度,又要维持足够的密闭时间。在一定磷化氢浓度下,一次性全部杀死粮内害虫的最佳密闭时间应等于施药后磷化氢浓度上升到杀虫有效浓度的时间+杀死该粮堆内害虫成虫和幼虫的时间+杀死成虫死亡前产出的卵在此环境中的孵化时间或存在的蛹的发育时间+杀死卵孵化出的幼虫和成虫的时间。实验证实,在粮温10～24℃、磷化铝3g/m3剂量下,采取环流熏蒸措施,杀死玉米象和赤拟谷盗最低需要21d,杀死谷蠢需要26～28d。
Circulation of phosphine is a complex process, it is necessary to master the effective concentration, but also to maintain adequate sealing time. At a given concentration of phosphine, the optimal time to kill all foodborne pests at one time should be equal to the time required for the phosphine concentration to rise to the insecticidal effective concentration after the application + to kill the adults and larvae of the pest Time + Egg production before the death of the adult hatch time in this environment or pupa developmental time present + Time to kill larvae and adults hatched by eggs. Experiments confirmed that the grain temperature 10 ~ 24 ℃, aluminum phosphide 3g / m3 dose, to take circulating fumigation measures to kill corn and red tarragon minimum required 21d, kill stupid need 26 ~ 28d.