Table 2. Time response of residues (ppm, dry weight) in soils as illustrated by geometric means.* 





















Dieldrin 
Time _ plots DDT plots Heptachlor plots 
Year since DDE + Heptachlors 
and application DDD + DDD + Heptachlor v- and 
_ month (months) — Dieldrin p.p'-DDT p.p'-DDE o,p'-DDT DDT DDT Heptachlor epoxide chlordane chlordanes 
1966 
May 0.1 1.41 ab 1.11 ab 0.011 d 0.18 a 1.29 a 1.3la 1.30 a 0.004 £ 0.27 a l.6la 
June 0.5 0.90 abed 0.51 b 0.009 d 0.16 a 0.67 a 0.68 a 0.54 ab 0.055 e 0.14 ab 0.77 be 
June 1.0 0.68 bed 0.49 b 0.032 ¢ O.1l a 0.61 a 0.65 a 0.31 be 0.11 de 0.15 ab 0.63 bed 
July 2.0 0.87 abed 0.58 ab 0.073 b 0.13 a O.7la 0.80 a 0.19 ed 0.15 ed 0.11 b 0.48 ed 
Sept. 4.0 0.37 d 0.50 b 0.076 b O.lla 0.61 a 0.63 a 0.12 ed 0.24 bed 0.11 b 0.50 ed 
Novy. 6.0 0.85 abed 1.34 a 0.095 ab 0.13 a 0.75 a 0.86 a 0.08 de 0.27 abed 0.12 b 0.54 ed 
1967 
Jan. 8.0 1.64 ab 0,82 ab 0.075 b 0.14 a 0.96 a l.lla 0.11 ed 0.28 abed 0.20 ab 0.62 bed 
March 10.0 0.57 ed 0.74 ab 0),070 b 0.17 a 0.92 a 0.99 a 0.09 de 0.23 bed 0.11 b 0.39 d 
May 12.0 0.53 ed 0.50 b 0.071 b 0.12 a 0.62 a 0.71 a 0.07 de 0.24 bed 0.11 b 0.43 ed 
Sept. 16.0 1.06 abc 0.61 ab 0.139 ab 0.13 a 0.78 a 0.94 a 0,06 de 0.35 abe 0.14 ab 0.61 bed 
1968 
Jan, 20.0 1.28 abe 1.09 ab ().202 a 0.18 a 1.28 a 1.48 a 0.07 de 0.59 ab 0.27 a 1.06 ab 
May 24.0 L7la 0.74 ab 0.196 a 0.13 a 0.88 a | 110 a 0.04 € — 0.68 a 0.18 ab 0.98 ab 
aGeometric means of three treatment levels, each with two replications. Means that do not share a common letter are significantly different. 
Table 3. Time responses of residues (ppm. dry weight) in earthworms as illustrated by geometric means.* 
Dieldrin 
Time plots DDT plots Heptachlor plots 
Year since DDE + Heptachlors 
and application DDD + DDD + Heptachlor y- and 
month (months) — Dieldrin p.p'-DDT p.p'-DDE p.p'-DDD DDT DDT Heptachlor epoxide chlordane chlordanes 
1966 
May 0.1 29.6 be 1.06 be 1.98 cde l4.7a 16.2a 18.4 a 1.26 ab 4.75 ed 4.53 ab 12.0 ab 
June 0.5 23.0 ¢ 1.55 be 3.30 b 12.1 ab 13.6 a 17.8 a 1.46 a 6.00 be 3.95 be 11.6 ab 
June 1.0 26.2 be 5.23 a 1.38 def 9.8 ab 15.3 a 16.8 a 0.39 be 2.6le 1.58 de 4.8 de 
July 2.0 39.9 ab 2,20 ab 7.68 a 10.1 ab 12.3 a 23.0 a 0.25 c 6.09 be 2.64 ed 9.5 be 
Sept. 4.0 50.1 a 1.15 be 2.38 be 10.8 ab 12.0 a 14.5 a 0.11 cd 10,17 a 6.55 a 17.2a 
Nov. 6.0 9.0 de 0.59 ed 1.25 ef 2.4 de 3.1 ed 4.3 de 0.007 e 2.42 e l.4le 3.9 ef 
1967 
Jan. 8.0 7.6 def 0.24 de 1.20 f 2.6 de 2.8 cd 4.le 0.004 ef 2.33 e 1.49 e 4.2 def 
March 10.0 6.6 ef 0.16 e 1.79 edef 3.5 de 3.7 cd 5.5 ede 0.033 d 3,23 de 1.63 de 4.9 de 
May 12.0 ll.4d 0.17 e 2.14 bed 6.7 be 6.8 b 9.1b 0,003 ef 4.45 ed 1.95 de 6.5 ed 
Sept. 16.0 117d O.l4e 2.74 be 3.9 ed 4.6 be 7.5 be 0.001 f 4.53 ed 1.36 e 5.9 ede 
1968 
Jan. 20.0 5.2 f 0.15 e 1.42 def 2.0e 21d 3.6 e 0.001 f 2.10 e 0.63 £ 2.8 f 
May 24.0 19.2¢ 0.17 e 2.42 be 4.0 ed 4.3 be 6.8 bed 0.001 f£ 8.11 ab 2.64 cd 10.9 ab 


aCeometric means of three treatment levels, each with two replications. Means that do not share a common letter are significantly different. 
