In this experiment three agronomic measures to degrade pesticide residue including chlorinated hydrocarbon such as benzene hexachloride and dichloro diphenyl trichloroethane in tea trees and tea eastate soil were ascertained. (1) Fertilization with the compost made of NH 4HCO 3 and peat soil or with NH 4HCO 3 alone in the roots. (2) Prunings of which deep pruning had the best effect, followed by heavy and light pruniug. (3) Spraying rare earth elements, NaHCO 3 and humic acidnate on the le...