DDT, Soil residues in mature pear orchards: … A Lake County survey
California Agriculture 20(6):10-12.
Published June 01, 1966
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DDT accumulated over the past 20 years was detected in 22 of 23 pear orchard soils sampled in this Lake County survey. Two-thirds of the DDT was found in the top 6 inches of soil and 94% in the upper 12 inches of soil. Most pear roots in cultivated orchard soils are concentrated between the 1- and 4-ft depths.