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= Q \ Fr ei 7 ~ ? --—- — 
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a 4 8 12 16 20 24 OS 4 3 1? ‘a. aD = 
TIME SINCE APPLICATION, MONTHS 
Fig. 2. Mean quantities of p,p'-DDT (A), p.p'-DDE (B), o,p'-DDT (soils only) and p.p"-DDD (earthworms only) (C), and DDT + 
DDD (D) in soils (solid lines) and earthworms (broken lines) at various times following a single application of 50% wettable powder 
DDT at 0.56 (circles), 2.24 (squares), or 8.97 (triangles) kg ai/ha. 

