期刊
JOURNAL OF HAZARDOUS MATERIALS
卷 231, 期 -, 页码 70-78出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.jhazmat.2012.06.040
关键词
Herbicide efficacy; Aged biochar; Sorption; Desorption
资金
- CSIRO's Sustainable Agriculture Research Flagship
- Department of Agriculture, Fisheries and Forestry of Australia
We studied the sorption-desorption behaviour of two herbicides (diuron and artrazine) in a soil rich in Fe and Al oxides (Ferrosol), either amended freshly with two different types of biochars or that contained biochars aged under field conditions. Standard batch sorption-desorption experiments were conducted on soil samples freshly amended with two biochars, (namely, poultry litter - PL and paper mill - PM sludge) as well on those collected from field 32 months after biochar application. Soils that were freshly amended with biochars @ 10 t ha(-1) showed a two (PM) to five (PL) fold increase in sorption of herbicides as compared with that in the unamended soil. For example, the fresh amendments with PL biochar at 10 t ha(-1) led to a highly significant (P<0.001) increase in the Freundlich sorption coefficient (K-f) of atrazine; i.e. 20.71 (n = 0.40) as compared with 4.02 (n = 0.70) for the control soil. Sorption was reversible in the unamended soil but sorption-desorption hysteresis was prominent in the soil amended with fresh biochars. In contrast, the soil containing aged biochars (at 10 t ha(-1)) exhibited sorption-desorption properties that were statistically similar to that of the control soil, especially for atrazine. Ageing of biochars in the soil over a 32 months period reduced the sorption capacity by 47% (PM) to 68% (PL) for diuron. These findings may have implications for herbicide efficacy in biochar amended soils. Crown Copyright (C) 2012 Published by Elsevier B.V. All rights reserved.
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