ศูนย์นวัตกรรมเทคโนโลยีหลังการเก็บเกี่ยว

The role of leaving maize unharvested in the field after field maturity (field-drying) in controlling aflatoxin contamination.

Nagler, M.; Buangsuwon, D.; Jewers, K.; Faungfupong, S.; Wong-urai, A.; Nagler, C.; Tanboon-ek, P.;

Mycotoxin prevention and control in foodgrains Year: 1992? Pages: 173-177 Ref: 1 ref.

1992

บทคัดย่อ

Studies in Thailand involving field-drying trials at 2 agricultural research stations and 35 grain drying trials in 2 provinces indicated that field-drying for 2-4 wk may have a significant role in controlling levels of aflatoxin in Thai maize. The field-drying trials were monitored weekly over a 6-wk period (7 treatments) in randomized replicates of 4 using the Suwan 1 variety of maize. 50 plants were used in each replicate and the trials were carried out in both the dry and rainy seasons. No trend towards an increase in aflatoxin contamination was found as field-drying time increased and levels of aflatoxin were low at harvest (<20 p.p.b.). There was also no significant increase in the occurrence of kernels damaged by mould or insects. In the rainy season, standing maize having a moisture content of 27-30% at field maturity, was found to have dried to 18-22% after 1 wk of field-drying. These results were consistent with those obtained during 35 mechanical drying trials. In these, maize with a field-drying history of 1-4 wk was shelled within 48 h of harvest, put in a drier within 12 h of shelling and dried to a moisture content of 14-16% in <48 h. The resulting maize had a total aflatoxin content which averaged <5 p.p.b. at a time when controls averaged >100 p.p.b. The advantages of field-drying are listed.