Sun drying on cement floors is the most common practice but the amount of rain limits the utility of the floors. Aflatoxin can became a serious problem, when the wet grain cannot be dried quickly. Research by DOA indicates that if the wet grain cannot be dried within 72 hours, Aflatoxin can be a problem. As shown in Fig. 1, local dealers will move the maize to Bangkok wholesalers for export or domestic use. Some local dealers also are involved in moving directly from producing area to overseas importers.
Cooperatives also take a small part in the marketing channel.
It was found that Aflatoxin contamination in pre-harvest maize is relatively low but increases rapidly during the period the grain is handled by local dealers. As the problem became serious, local dealers now pay more attention to solutions. Several types of mechanical dryers, storage facilities and siloes with dryers have been placed in many parts of the country for drying and handling the grain. Some mould inhibitors also are used in domestic feeds. Control of Aflatoxin in Maize Aflatoxin content has become a major factor affecting the export of maize and most importers have set aflatoxin limits, usually in the range of 20 to 100 ppb.