PHOSPHINE FUMIGATION PROCEDURE
Applied On Bagged And Bulk Paddy In Southern Asia Using Conventional And Slow Release Phosphine
Phosphine fumigations of paddy rice in bagged-stacks and in bulk are undertaken at a Grain Depot.
Bagged paddy are stored protected from the weather in concrete warehouses and are sheeted on the bottom, top and four sides with clear polyvinyl chloride (PVC).
Sheets are heat-sealed together and sealed to the floor by rubber tubes and plastics grooves. In the bulk paddy warehouse, concentrations of phosphine to remain above 375 ppm for the first 5 days.
The moisture content of the paddy is at max 12.8%.
Conventional application of tablets in plastics bags with a slow release technique, 7 g/m3 aluminium phosphine 56% tablets to apply to the warehouse.
Bagged paddy, sheeted on the bottom, top and four sides with 140 m PVC film supplied a good sealing condition for fumigation. Slow release technique completely controlled all known resistant insects and by successfully prolonging the period of effective concentration of phosphine.
This method could be recommended for grain storage practice
Similar procedure is used in Ocean vessel transportation where possible