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采用仓内薄膜吊顶方式对老式平房仓进行改造,采取压力衰减法测定仓房的半衰期,参照《磷化氢环流熏蒸技术规程》测定磷化氢浓度,定时测定粮温、仓温、外温。结果表明:试验仓房在仓内薄膜吊顶后,压力半衰期高于对照仓32.0s;在相同用药量下,试验仓的磷化氢浓度提高了153mL/m3,保持有效浓度150mL/m3的天数增加了19d;夏季高温季节,试验仓的仓温低于对照仓3℃~4℃,上层平均粮温低于对照仓2℃~4℃。
The old warehouse was reconstructed by the way of film dome in warehouse. The half-life of warehouse was measured by pressure decay method. The concentration of phosphine was determined according to the Technical Regulation of Phosphine Circulating Fumigation. The temperature, temperature and temperature were measured regularly. The results showed that the pressure half-life of the warehouse was 32.0s higher than that of the control warehouse after the ceiling of the warehouse was in the warehouse. With the same dosage, the concentration of phosphine in the warehouse increased by 153mL / m3 and the number of days with the effective concentration of 150mL / m3 increased 19d; summer hot season, the experimental warehouse temperature lower than the control warehouse 3 ℃ ~ 4 ℃, the average upper grain temperature lower than the control warehouse 2 ℃ ~ 4 ℃.