Effects of Outside Air Temperature on Movement of Phosphine Gas in Concrete Elevator Bins
Studies that measured the movement and concentration of phosphine gas in upright concrete bins over time indicated that fumigant movement was dictated by air currents, which in turn,were a function of the difference between the average grain temperature and the average outside air temperature during the two weeks following application of the aluminum phosphide pellets. When the grain was warmer than the average outside air temperature during these two weeks, the phosphine gas would move upward through the grain mass. When the grain was cooler than the average outside air during these two weeks, the fumigant moved downward. Because insect problems normally occur in the top of the grain mass early in the storage season (June-August),a uniform application of fumigant pellets was more effective when the grain and outside air temperatures were similar during the two weeks following application of the fumigant. When grain was much warmer than the average outside air temperature during these two weeks, applying more fumigant pellets into the bottom half of the grain mass was the most effective strategy. If the grain temperature is expected to be cooler than the average outside air temperature during the two weeks following application of the fumigant, applying more pellets to the upper half of the grain mass would be the best strategy.
Paul Flinn Carl Reed
USDA-ARS Grain Marketing & Production Research Center,Manhattan,Kansas 66502 ( USA ) Kansas State University, Manhattan, Kansas 66502 ( USA )
国际会议
成都
英文
704-706
2008-09-21（万方平台首次上网日期，不代表论文的发表时间）