Botany Department, Lucknow University, Lucknow-226 007, India


Tuber/Bulb crops
Post-harvest processes

How to Cite

Botany Department, Lucknow University, Lucknow-226 007, India. (1992). Tropical Agriculture, 69(1).


Heptachlor and heptachlor epoxide residues as influenced by the post-harvest processes of washing, boiling/cooking and dehydration were determined in the mature tubers/bulbs of sweet potato, potato and onion grown on clay-loam soil treated with 2.5, 5.0 and 10.0 kg a.i. ha-1 35 days before harvest. Washing removed 22-29% insecticide from all crops. Sweet potato and potato were deprived of 85-93 % and 94-100% of heptachlor residues by washing plus peeling and cooking. Dehydration reduced the residues by 74-100%, 80-100% and 84-100% in sweet potato, potato and onion, respectively. As low as 0.03 ppm of heptachlor from the 10 kg a.i. ha-1 application was detected in sweet potato and potato after cooking, whereas in onion no residue was found.