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dc.contributor.authorLanger, S.en
dc.contributor.authorCichota, R.en
dc.contributor.authorThomas, Steveen
dc.contributor.authorWallace, Dirken
dc.contributor.authorVan Der Klei, G.en
dc.contributor.authorGeorge, M.en
dc.contributor.authorJohns, T.en
dc.contributor.authorAlmond, Peter C.en
dc.contributor.authorMaley, S.en
dc.contributor.authorArnold, N.en
dc.contributor.authorHu, Weien
dc.contributor.authorSrinivasan, M.en
dc.contributor.authorRajanayaka, Channa Nen
dc.contributor.authorDodson, M.en
dc.contributor.authorHayman, R.en
dc.contributor.authorGhimire, C.en
dc.description.abstractIrrigation is likely to increase water losses from hillslopes, particularly on loess-derived soils with impeded drainage. This is important as irrigation of these soils in New Zealand is increasing. A field site was established to monitor runoff from a pasture hillslope irrigated by a centre-pivot in South Canterbury. Between November and March, 161 and 199 mm of irrigation was applied, 23% more at the bottom of the slope. Runoff varied with position in the hillslope, 3.5 times greater on the bottom plot (52 mm) compared to the top. Over the length of the slope (40 m) this represents a potential loss of 9% of precipitation, or 21% of the irrigation. Evidence for both saturation excess and infiltration excess runoff was observed, with antecedent soil moisture conditions being a key factor. Pasture production and water use efficiency (WUE) also varied with slope, the least (4.6 t DM/ha or 12 kg DM/ha/mm) observed at the middle and most at the top of the slope (10.1 t DM/ha or 23 kg DM/ha/mm). This was likely due to a combination of differences in radiation and soil conditions. There was indication that pasture growth was limited by water availability at the top and potentially excess at the bottom of the slope. Our results indicate potential for improving irrigation practices.en
dc.publisherNew Zealand Grassland Associationen
dc.relationThe original publication is available from - New Zealand Grassland Association -
dc.rights© The Authors and the New Zealand Grassland Association.en
dc.rightsAttribution-NonCommercial-NoDerivatives 4.0 International*
dc.subjectwater balanceen
dc.titleUnderstanding water losses from irrigated pastures on loess-derived hillslopesen
dc.typeJournal Article
lu.contributor.unitLincoln Universityen
lu.contributor.unitFaculty of Agriculture and Life Sciencesen
lu.contributor.unitDepartment of Soil and Physical Sciencesen
dc.subject.anzsrc0701 Agriculture, Land and Farm Managementen
dc.subject.anzsrc050302 Land Capability and Soil Degradationen
dc.subject.anzsrc05 Environmental Sciencesen
dc.subject.anzsrc0703 Crop and Pasture Productionen
dc.subject.anzsrc079901 Agricultural Hydrology (Drainage, Flooding, Irrigation, Quality, etc.)en
dc.relation.isPartOfJournal of New Zealand Grasslandsen
pubs.notesVolume 82 of the Journal of New Zealand Grasslands was published online only during 2020. Each paper was uploaded as soon as the proofs were finalised. Papers in this volume will be presented at the NZGA conference in Invercargill in 2021.en
pubs.organisational-group/LU/Agriculture and Life Sciences
pubs.organisational-group/LU/Agriculture and Life Sciences/SOILS
pubs.organisational-group/LU/Research Management Office
pubs.organisational-group/LU/Research Management Office/QE18

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