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对于粮堆高接近 6m ,体积 50 0 0m3 左右的包围散玉米粮堆 ,其常规熏蒸存在以下几个问题 :第一 ,PH3 自由渗透能力较差 ,无法在短时间内均匀扩散至整个粮堆 ,造成局部粮堆PH3 保持高浓度时间较长 ,害虫易出现长期保护性昏迷 ,无法确定此处储粮害虫的致死时间 ,因而无法把握杀虫
The conventional fumigation has the following problems for the surrounding scattered corn grain piles which are close to 6m in grain height and about 500m in volume: First, the free infiltration capacity of PH3 is poor and can not be evenly spread to the whole grain piles in a short time, As a result, the PH3 of the local food piles is kept at a high concentration for a long time, pests are prone to long-term protective coma, and the lethal time of grain pests in this area can not be determined,