Pesticide Effects in Soils on Nitrification and Plant Growth

Pesticide Residues in Soil and Water

“…In fact, a number of workers have reported increases in numbers of micro-organisms due to organochlorine insecticides, possibly because microbes can use pesticides carbon sources (Verona, 1952;Fletcher and Bollen, 1954;Roberts and Bollen, 1955). Several workers have confirmed that none of the organochlorine insecticides affected micro-organisms (Martin et aL, 1959;Eno and Everett, 1958;Wegorek, 1957;Shaw and Robinson, 1960). Fungi seem more susceptible than bacteria, which are almost immune .…”

Effect of DDT on Cone Production, Germination, and Seedling Survival in the Boreal Forest

“…The effects of this persistence on growth are less thoroughly documented and range from stimulation by low conicentrations of DDT in soils (Chapman and Allen 1948;Shaw and Robinson 1960) to severe stunting (Thurston 1953).…”

Interaction of three Iowa surface soils with the organophosphorus insecticide Counter®

“…These studies were made in a 2-week period. Organochlorine insecticides exhibited no inhibitory effects on nitrification when tested at field rates (Ross 1952, Martin et al 1959, Shaw and Robinson 1960. At 1000 ppm, aldrin, dieldrin, and chlordane were inhibitory (Brown 1954, Jones 1956).…”

“…Aldrin showed no inhibition of nitrification at rates up to 1000 ppm (Ross 1952, Brown 1954, Fletcher and Boll en 1954, Jones 1956, Eno and Everett 1958, Shaw and Robinson 1960, Bardiya and Gaur 1970. Jones (1956) observed a 50% reduction in nitrification when aldrin was applied Brown (1954) reported inhibition of nitrification from chlordane at 1000 and 10,000 ppm and heptachlor at 10,000 ppm.…”

“…Concentrations of chlordane ranging between 2000 and 20,000 ppm reduced nitrate production from 75 to 100% (Jones 1956). No effect was demonstrated when heptachlor or chlordane were applied at rates of 200 ppm or less (Ross 1952, Brown 1954, Jones 1956, Eno and Everett 1958, Shaw and Robinson 1960.…”