Grazing strategies for reducing contaminant losses in surface runoff from winter forage crop fields located in hill country and grazed by sheep.
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| Title: | Grazing strategies for reducing contaminant losses in surface runoff from winter forage crop fields located in hill country and grazed by sheep. |
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| Authors: | Ghimire, Chandra Prasad1 (AUTHOR) c_ghimire@yahoo.com, Monaghan, Ross2 (AUTHOR), Rutherford, Alison2 (AUTHOR), Muirhead, Richard2 (AUTHOR), Lasseur, Remy1 (AUTHOR) |
| Source: | New Zealand Journal of Agricultural Research. Oct2025, Vol. 68 Issue 5, p1065-1081. 17p. |
| Subjects: | Escherichia coli, Cole crops, Weather, Rapeseed, Spring |
| Abstract: | A paired catchment study approach was used to quantify fluxes of Nitrogen (N), Phosphorus (P), sediment and Escherichia coli (E. coli) in surface runoff from fields where sheep were wintered on swede (Brassica napus) and kale (Brassica oleracea) crops. The effectiveness of a strategic grazing approach that protected critical source areas (CSAs) was examined to determine if these fluxes could be reduced. Averaged over two years, estimated fluxes of N, P and sediment in surface runoff recorded in winter and early spring (June-September) were up to 0.64, 0.22 and 51 kg ha−1, respectively, and up to 2 × 1011 MPN ha−1 for E. coli. With the exception of E. coli, these fluxes were low compared to those reported in other studies and largely attributed to the low amounts of surface runoff recorded. This, in turn, can be explained by relatively benign weather conditions recorded during the study period and the relatively light grazing pressures imposed by sheep. Compared to standard grazing practice, protection of CSAs reduced N, P, sediment, and E. coli fluxes by 38%, 48%, 55% and 63%, respectively. These reductions can largely be attributed to lower concentrations of contaminants in surface runoff when the CSA was protected. [ABSTRACT FROM AUTHOR] |
| Copyright of New Zealand Journal of Agricultural Research is the property of Taylor & Francis Ltd and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.) | |
| Database: | Engineering Source |
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| Header | DbId: egs DbLabel: Engineering Source An: 186209070 AccessLevel: 6 PubType: Academic Journal PubTypeId: academicJournal PreciseRelevancyScore: 0 |
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| Items | – Name: Title Label: Title Group: Ti Data: Grazing strategies for reducing contaminant losses in surface runoff from winter forage crop fields located in hill country and grazed by sheep. – Name: Author Label: Authors Group: Au Data: <searchLink fieldCode="AR" term="%22Ghimire%2C+Chandra+Prasad%22">Ghimire, Chandra Prasad</searchLink><relatesTo>1</relatesTo> (AUTHOR)<i> c_ghimire@yahoo.com</i><br /><searchLink fieldCode="AR" term="%22Monaghan%2C+Ross%22">Monaghan, Ross</searchLink><relatesTo>2</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Rutherford%2C+Alison%22">Rutherford, Alison</searchLink><relatesTo>2</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Muirhead%2C+Richard%22">Muirhead, Richard</searchLink><relatesTo>2</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Lasseur%2C+Remy%22">Lasseur, Remy</searchLink><relatesTo>1</relatesTo> (AUTHOR) – Name: TitleSource Label: Source Group: Src Data: <searchLink fieldCode="JN" term="%22New+Zealand+Journal+of+Agricultural+Research%22">New Zealand Journal of Agricultural Research</searchLink>. Oct2025, Vol. 68 Issue 5, p1065-1081. 17p. – Name: Subject Label: Subjects Group: Su Data: <searchLink fieldCode="DE" term="%22Escherichia+coli%22">Escherichia coli</searchLink><br /><searchLink fieldCode="DE" term="%22Cole+crops%22">Cole crops</searchLink><br /><searchLink fieldCode="DE" term="%22Weather%22">Weather</searchLink><br /><searchLink fieldCode="DE" term="%22Rapeseed%22">Rapeseed</searchLink><br /><searchLink fieldCode="DE" term="%22Spring%22">Spring</searchLink> – Name: Abstract Label: Abstract Group: Ab Data: A paired catchment study approach was used to quantify fluxes of Nitrogen (N), Phosphorus (P), sediment and Escherichia coli (E. coli) in surface runoff from fields where sheep were wintered on swede (Brassica napus) and kale (Brassica oleracea) crops. The effectiveness of a strategic grazing approach that protected critical source areas (CSAs) was examined to determine if these fluxes could be reduced. Averaged over two years, estimated fluxes of N, P and sediment in surface runoff recorded in winter and early spring (June-September) were up to 0.64, 0.22 and 51 kg ha−1, respectively, and up to 2 × 1011 MPN ha−1 for E. coli. With the exception of E. coli, these fluxes were low compared to those reported in other studies and largely attributed to the low amounts of surface runoff recorded. This, in turn, can be explained by relatively benign weather conditions recorded during the study period and the relatively light grazing pressures imposed by sheep. Compared to standard grazing practice, protection of CSAs reduced N, P, sediment, and E. coli fluxes by 38%, 48%, 55% and 63%, respectively. These reductions can largely be attributed to lower concentrations of contaminants in surface runoff when the CSA was protected. [ABSTRACT FROM AUTHOR] – Name: AbstractSuppliedCopyright Label: Group: Ab Data: <i>Copyright of New Zealand Journal of Agricultural Research is the property of Taylor & Francis Ltd and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract.</i> (Copyright applies to all Abstracts.) |
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| RecordInfo | BibRecord: BibEntity: Identifiers: – Type: doi Value: 10.1080/00288233.2024.2336043 Languages: – Code: eng Text: English PhysicalDescription: Pagination: PageCount: 17 StartPage: 1065 Subjects: – SubjectFull: Escherichia coli Type: general – SubjectFull: Cole crops Type: general – SubjectFull: Weather Type: general – SubjectFull: Rapeseed Type: general – SubjectFull: Spring Type: general Titles: – TitleFull: Grazing strategies for reducing contaminant losses in surface runoff from winter forage crop fields located in hill country and grazed by sheep. Type: main BibRelationships: HasContributorRelationships: – PersonEntity: Name: NameFull: Ghimire, Chandra Prasad – PersonEntity: Name: NameFull: Monaghan, Ross – PersonEntity: Name: NameFull: Rutherford, Alison – PersonEntity: Name: NameFull: Muirhead, Richard – PersonEntity: Name: NameFull: Lasseur, Remy IsPartOfRelationships: – BibEntity: Dates: – D: 01 M: 10 Text: Oct2025 Type: published Y: 2025 Identifiers: – Type: issn-print Value: 00288233 Numbering: – Type: volume Value: 68 – Type: issue Value: 5 Titles: – TitleFull: New Zealand Journal of Agricultural Research Type: main |
| ResultId | 1 |
