
Although the path is not known, it has also been shown that 
some soil microorganisms can open the triazine ring and degrade it 
to CO (Montgomery, 1958; Pochon et al., 1960; Guillemat et al., 
1960a, b; Ragab and McCollum, 1961). Fungi metabolized the side 
chains but did not open the ring to any appreciable extent (Couch 
et al.,1965). 
Atrazine (2-Chloro-4-ethylamino-6-isopropylamino-S-triazine) 
cl4-atrazine was applied to susceptible and resistant plants. 
These studies showed that all test plants converted some atrazine 
to hydroxyatrazine and that the amount was related somewhat to 
resistance (Freed and Montgomery, 1962; Roberts et al., 1964; 
Negi et al., 1964a, b). Degradation of cl4-ring-labeled atrazine 
to cho, is not a significant process in plants (Davis et al., 1965). 
Hydroxyatrazine was also metabolized readily by oats (Freed and 
Montgomery, 1962). 
cl4o, production from ring-labeled atrazine by microorganisms 
has been observed (Davis et al., 1965). The fungus, F. roseum, 
metabolized atrazine to hydroxyatrazine (Couch et al., 1965). 
Propazine(2-Chloro-4, 6-bis[isopropylamino] -S-triazine) 
Propazine-c!4 was metabolized by cane (Sorghum vulgare L.) 
but not by oats (Avena) (Foy, 1960, 1962b, c). 
Ipazine (2-Chloro-4-diethylamino-6-isopropylamino-S-triazine) 
Cotton did not extensively degrade the triazine ring of cl4- 
labeled ipazine. Evolution of cl4o, from culture solutions was 
not observed; however, cl4o, evolution when the soil was treated, 
162 
