Ans'rluC'l'To determillt, thc effcct of modc of application and a co\'er ('rop 011the persistl'lIee IIl1d\'Crtielll distribution of inseeticides in soils, lipId tpsts \\'Ne eonduded On-I'll 3-year period. Aldrin lIml hpptllehlor \\'crp applied either to the soil sllI'face only or ineorpol':lted into til(' soil hy rototilling to approximately .5inches. Hp('O\'l'I'icsof insel'lieidnl residups ran!-(l'dfrom 2.7% to 5.3% of the upplil'C1dosages, .J. mOllths after a soil-smfacc application. 1IO\\'c\'('1', ineorporation of illsl'eticidal deposits into thc upper soillll~'ers inerl'asNi thc pl"'sistl'nce of the residues by a f:lctor of ](I. One year after trcutmpnt of the upper soil layers, 90% of the rC('o\'('red residues \\'erl' loeated within the upper 3 inehes of the
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