A Preplant is Refers to the timing of Pest control operations. Preplant operations are accomplished during the period subsequent to the harvest of one season"s crop and prior to the planting of the next season"s crop.

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Other /More definition:
A Preplant is Refers to the timing of pest control operations. Preplant operations are accomplished during the period subsequent to the harvest of one season"s crop and prior to the planting of the next season"s crop.