Root uptake of c!+~diuron from solution was studied. The major 
component in cotton leaves was identified as 1~(3,4-dichlorophenyl)urea. 
In soybean leaves, the major component was identified as 1-(3,4-dichloro- 
phenyl)-3-methylurea. Small amounts of the monomethyl and demethylated 
derivatives were found in the nutrient solutions from cotton and soybeans 
as well as in oat and com tops (1289, 1332). When leaf discs of cotton 
(Gossypuim hirsutum L.) and broadleaf plantain (Plantago major L.) were 
incubated with diuron, mono- and di- demethylated diuron and 3,4-dichloro- 
phenylurea were observed. With soybean (Glycine max Merrill), only the 
mono- demethylated diuron was found. Degradation of diuron by com (Zea 
mays L.) resulted only in minute amounts of the mono- demethylated diuron 
(17 1T3):, 
Labeled diuron was applied to the leaf and to the nutrient solution 
of corn seedlings. Analyses of samples of leaf washes, nutrient, solutions 
and corn seedlings indicated the presence of 3,4-dichloronitrobenzene, 
3-(3,4-dichlorophenyl)-l-methylurea, N-(3,4-dichlorophenyl)urea and 3,4- 
dichloroaniline (1109, 1586). 
When oat seedlings were grown in a modified Lakeland sandy loam soil, 
an increase in soil pH resulted in greater amounts of diuron in the shoots. 
Herbicide content of roots was independent of pH, organic matter, or temper- 
ature modifications. In addition to diuron, mono demethylated diuron was 
observed in the shoots (1677). 
Under field conditions, diuron degradation in soil was demonstrated 
by isolation and identification of intermediate breakdown products. After 
isolation and TLC, infrared spectra were used to confirm the identification 
of the degradation products (334): 3-(3,4-dichloropheny1)-1l-methylurea; 
3-(3,4-dichlorophenyl)urea; 3,4-dichloroaniline (1289, 1728). 
Fluometuron (Cotoran) [3-(m-trifluoromethylphenyl)-1,1-dimethylurea] 
c!4-labeled fluometuron was metabolized in vivo, primarily by the 
liver, to the N-desmethyl and N-demethylated analogs which were excreted 
as conjugates in the urine. A small amount was excreted as the aniline 
analog. No labeled COs was detected during the first 48 hours (154). 
After treatment of cucumbers and cotton with fluometuron, the cit. 
metabolites were determined by autoradiography. The monomethylated, de- 
methylated, and aniline derivatives were identified from cotton. Only the 
mono- and de-methylated derivatives were identified from cucumber (1231, 1232, 
1588). 
338 
