: Anything affecting soil microbial populations may affect persistence 
of organic herbicides. Organic matter, pH, and cation exchange capacity 
are important factors affecting microbial decomposition of dalapon 
(Holstun and Loomis, 1956; Kaufman, 1964). 
Cl O 
0 
cH. -¢-c” A Dis 4 
eh rn rthrobacter sp. soi 
b, ~0 | 0 
Alternaria sp. 
a ye 
CH -e-0” 
3 i “8 
O 
DDP (di-n-propyl-2,2-dichlorovinyl phosphate) 
Enzymatic studies with chymotrypsin have shown that DDP phosphorylated 
protein without releasing acid. At the same time, dichloroacetaldehyde was 
liberated (Jandorf, 1956). Studies with DDVP have shown that the aldehyde 
may then be metabolized to the saturated alcohol and conjugated as the 
glucuronide. (See DDVP). 
1 Cl 
(CHO), -P-O-CH=C 
Cl 
Protein 0 
CH» -0-P-(0C3H7) 9 
Cl O 
/ 4G 
HO-CH=C + HiAcHre 
\ ‘\ 
Cl C N 
ON pH” 
0 cl 
NN 
Sea 
H Cl 
HO-CH-CHCly ———»— Glucuronide 
71 
