J. Dec et al., FORMATION OF SOIL-BOUND RESIDUES OF CYPRODINIL AND THEIR PLANT UPTAKE, Journal of agricultural and food chemistry, 45(2), 1997, pp. 514-520
The fungicide cyprodinil [4-cyclopropyl-6-methyl-2-(phenylamino)pyrimi
dine] labeled with C-14 in either the phenyl or the pyrimidyl ring was
incubated with four different soils under various conditions to evalu
ate the formation of bound residues and their subsequent plant uptake.
About 60% of the initially applied radioactivity was bound to nonster
ile soils within 90-180 days, whereas negligible binding was observed
under sterile and anaerobic conditions. More binding was observed at h
igher soil pH, cation exchange capacity, and organic carbon and nitrog
en contents. When spring barley was grown in the methanol-extracted so
il, the plant uptake of bound residues amounted to about 0.2% for the
phenyl label and 1.2% for the pyrimidyl label. The difference indicate
d that the pyrimidyl moiety was detached from the cyprodinil molecule
and taken up more readily.