Ware G W, Estesen B J, Buck N A, Cahill W P
Pestic Monit J. 1978 Jun;12(1):1-3.
The moratorium on agricultural use of DDT in Arizona that began in January 1969 proved very effective during the first 7 years of enforcement. Residues on green alfalfa declined significantly to a probable inherent level of 0.02 ppm wet weight. Soil residues of sigmaDDT-related degradation products declined significantly, averaging 23 percent; residues in desert soils declined 60 percent. The sigmaDDT half-life in irrigated soils was about 7 years; it decreased to 2.5 years in nonirrigated soils.
1969年1月开始在亚利桑那州暂停农业使用滴滴涕，在执行的头7年里证明非常有效。绿色苜蓿上的残留量显著下降至湿重0.02 ppm的可能固有水平。与σ-滴滴涕相关的降解产物的土壤残留量显著下降，平均下降23%；沙漠土壤中的残留量下降了60%。σ-滴滴涕在灌溉土壤中的半衰期约为7年；在非灌溉土壤中降至2.5年。
