We found a match
Your institution may have access to this item. Find your institution then sign in to continue.
- Title
Simulation of the persistence of eight soil-applied herbicides.
- Authors
Walker, A.
- Abstract
The effects of soil temperature and soil moisture content on the rates of degradation of simazine, atrazine, propyzamide, linuron, metamitron, trifluralin, metribuzin and chlorthal-dimethyl were measured in a sandy loam soil under controlled laboratory conditions. Atrazine degradation was the least dependent on soil moisture and metamitron degradation the most. Linuron degradation was the least affected by temperature and degradation of chlorthal-dimethyl was the most temperature-dependent. In the field, trifluralin, linuron and chlorthal-dimethyl were the most persistent herbicides with over 40% of the amounts applied remaining 5 months after application in spring. Simazine and propyzamide were intermediate with residues between 20 and 30% of the initial dose. Atrazine, metamitron and metribuzin were the least persistent with residues generally less than 20% of the amounts present initially. Weather records for the periods of the field experiments were used in conjunction with the appropriate constants derived from the laboratory data in a computer program to simulate persistence in the field. The model predicted with reasonable accuracy the relative order of persistence of the different herbicides, with the exception of metribuzin. With simazine, atrazine, propyzamide and in particular, metribuzin, there was a tendency to underestimate rates of loss. It is suggested that herbicide mobility in the soil was responsible for the poor agreement in some experiments.
- Subjects
SOIL temperature; SOIL moisture; SANDY loam soils; HERBICIDES; COMPUTER software
- Publication
Weed Research, 1978, Vol 18, Issue 5, p305
- ISSN
0043-1737
- Publication type
Article
- DOI
10.1111/j.1365-3180.1978.tb01165.x