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- Title
EWRS Herbicide-Soil Working Group: Collaborative experiment on simazine persistence in soil.
- Authors
Walker, A.; Hance, R. J.; Allen, J. G.; Briggs, G. G.; Yuh-Lin Chen; Gaynor, J. D.; Hogue, E. J.; Malquori, A.; Moody, K.; Moyer, J. R.; Pestemer, W.; Rahman, A.; Smith, A. E.; Streibig, J. C.; Torstensson, N. T. L.; Widyanto, L. S.; Zandvoort, R.
- Abstract
The effects of soil temperature and soil moisture content on the rate of simazine degradation were measured in the laboratory in soils from sixteen sites located in several different countries. First-order half-lives under standard incubation conditions were significantly correlated with clay content. organic carbon content and soil pH in a multiple linear regression. The temperature dependence of degradation was similar in the different soils whereas the moisture dependence showed considerable variation between soils. Persistence of simazine seas also measured in the same soils in the field and at five additional sites. Weather records from the different sites for the periods of the field experiments were used in conjunction with constants derived from the laboratory data in a computer program to simulate persistence in the field. In general, the model overestimated residues in the field. About half of the calculated residues were within ±25% of those observed, an accuracy sufficient for practical purposes, but on several occasions the discrepancies between calculated and observed residues were greater than 50%. Possible reasons for the discrepancies and requirements For further experiments are discussed.
- Subjects
TEMPERATURE; SOILS; MOISTURE; REGRESSION analysis; COMPUTER software
- Publication
Weed Research, 1983, Vol 23, Issue 6, p373
- ISSN
0043-1737
- Publication type
Article
- DOI
10.1111/j.1365-3180.1983.tb00561.x