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- Title
THE EFFECT OF REPEATED FIELD APPLICATIONS OF FOUR HERBICIDES ON THE EVOLUTION OF CARBON DIOXIDE AND MINERALIZATION OF NITROGEN IN SOIL.
- Authors
Grossbard, E.
- Abstract
The effect of repeated annual applications over 7-8 years of MCPA, triallate, simazine and linuron to field plots on the evolution of CO2 and mineralization of nitrogen in soil samples incubated in the laboratory is described. The plots were either cropped and treated with standard doses, or uncropped and sprayed with doses 3-4 times above the level used in agricultural practice. While the applications of MCPA and tri-allate did not exert any inhibitory effects in soils from the uncropped plots those of simazine and linuron led to a lowering in CO2 output in several instances and in mineral N on infrequent occasions. These effects are assumed to be the result of a difference in the content of easily-degradable organic matter between the treated plotsand the controls. A direct anti-microbial action of the two herbicides is not very probable because in laboratory experiments with simazine up to 512 ppm the output of CO2 and the mineralization of N was not affected while linuron at 500 ppm gave only a minor depression in CO2 evolution. Effects on soil fertility are unknown but seem unlikely in view of the small extent and infrequency of the reductions observed. On the cropped plots the MCPA and tri-allate treatment showed no effects. With linuron and simazine a significant lowering in respiration and mineralization of N occurred on single occasions only, during a 5-year period.
- Subjects
MCPA (Herbicide); AGRICULTURAL chemicals; NITROGEN in soils; PLANTS
- Publication
Weed Research, 1971, Vol 11, Issue 4, p263
- ISSN
0043-1737
- Publication type
Article
- DOI
10.1111/j.1365-3180.1971.tb01009.x