DDT MORATORIUM IN ARIZONA - AGRICULTURAL RESIDUES AFTER 7 YEARS

  • 1 January 1978
    • journal article
    • research article
    • Vol. 12  (1) , 1-3
Abstract
The moratorium on agricultural use of DDT in Arizona, USA, that began in Jan. 1969 proved very effective during the first 7 yr of enforcement. Residues on green alfalfa declined significantly to a probable inherent level of 0.02 ppm wet wt. Soil residues of .SIGMA.DDT-related degradation products declined significantly, averaging 23%; residues in desert soils declined 60%. The .SIGMA.DDT half-life in irrigated soils was about 7 yr; it decreased to 2.5 yr in nonirrigated soils.

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