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The leaching behaviour of herbicides in cropping soils amended with forestry biowastes

journal contribution
posted on 2023-05-03, 20:28 authored by Trevor JamesTrevor James, Hossein Ghanizadeh, Kerry Harrington, Nanthi Bolan
Leaching of herbicides in cropping soils not only impacts the groundwater sources but also reduces their effect in controlling weeds. Leaching studies were carried out in two cropping soils and two forestry biowaste media, wood pulp and sawdust with two herbicides, atrazine and bromacil in a packed lysimeter with simulated rainfall. The hypothesis was that high organic matter forestry biowaste soil amendments reduce the leaching of herbicides through the soil profile. Results from the experimental setups varied due to the impact of the simulated rainfall on the surface structure of the media. Organic carbon content, pH and structure of the media were all factors which affected the leaching of the two herbicides. The hypothesis was true for wood pulp, but for sawdust, organic matter content had less bearing on the leaching of the herbicides than other over-riding factors, such as pH, that were media specific. In sawdust, its large particle size and related pore volume allowed preferential flow of herbicides. Overall, the data indicated that both forestry biowastes were retentive to herbicide leaching, but the effect was more pronounced with wood pulp than sawdust.

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Rights statement

© 2022 Elsevier Ltd. All rights reserved.

Language

  • English

Does this contain Māori information or data?

  • No

Publisher

Elsevier

Journal title

Environmental Pollution

ISSN

0269-7491

Citation

James, T. K., Ghanizadeh, H., Harrington, K. C., & Bolan, N. S. (2022). The leaching behaviour of herbicides in cropping soils amended with forestry biowastes. Environmental Pollution, 307, 119466. https://doi.org/10.1016/j.envpol.2022.119466

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