The herbicides Diquat (1, 1'-ethylene-2, 2'-dipyridylium
dibromide), Paraquat (1, 1'-dimethyl-4, 4'-dipyridylium dichloride),
and Gramoxone (1, 1'-dimethyl-4, 4'-dipyridylium dimethyl sulphate), and the spreader X-77, a mixture of alkylaryl-polyethylene
glycol, free fatty acids and isopropanol, were tested by
several soil microbial methods in an attempt to find out if concentrations of these...