Výsledky vyhledávání - "D. A. Costall"

Evaluation of urine excretion from dairy cows under two farm systems using urine sensors

Autor: Paul R. Shorten, D. A. Costall, Mark Shepherd, Kelli P. A. MacDonald

Publikováno v: Agriculture, Ecosystems & Environment. 236:285-294

Urine nitrogen (N) is the main source of N leaching from pasture grazed by dairy cows. The aim of this work was to compare urine-N excretion from lactating dairy cows under two contrasting farm systems (Future (F) and Current (C)). The farm systems d

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::11658bb0e511b849b4a9bce74e5e40cb
https://doi.org/10.1016/j.agee.2016.12.017

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Evaluation of refractive index for measuring urinary nitrogen concentration in a sensor worn by grazing female cattle

Autor: Mark Shepherd, D. A. Costall, Maryann Pirie, G. P. Cosgrove, Keith Betteridge, Brendon Welten

Publikováno v: New Zealand Journal of Agricultural Research. 60:23-31

A urine sensor has been developed to measure the volume and nitrogen (N) concentration of individual urination events from female cattle in the field. The objective of this paper was to establish that the sensor’s refractive index (RI) value could

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::49d9a55bf97e334ac3d6b5ff61e43aa9
https://doi.org/10.1080/00288233.2016.1237979

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Soil organic carbon stocks in hill country pastures under contrasting phosphorus fertiliser and sheep stocking regimes, and topographical features

Autor: D. A. Costall, Ronaldo Vibart, Catherine McKenzie, Franco Bilotto, Alec D. Mackay, Francis M. Kelliher

Publikováno v: Agricultural Systems. 186:102980

Temporal and spatial measurements of soil organic carbon (C) under grazed pastures are needed to quantify the effects of different grazing management regimes on C stocks. We examined soil organic C stocks under permanent pastures at the Ballantrae Hi

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::afb6ca00f5503d1e6e54c597f41e16c7
https://doi.org/10.1016/j.agsy.2020.102980

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Nitrogen concentration in the urine of cattle, sheep and deer grazing a common ryegrass/cocksfoot/white clover pasture

Autor: C. J. Hoogendoorn, Stewart Ledgard, D. A. Costall, Keith Betteridge

Publikováno v: New Zealand Journal of Agricultural Research. 53:235-243

Total nitrogen (N) concentration in the urine of 12- to 18-month old female sheep, cattle and deer grazing a common pasture was measured in the morning, noon and evening for three consecutive days on two separate occasions in spring, and on a single

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::c1a11afeaea08aa4fa8c33b7d9f94cd3
https://doi.org/10.1080/00288233.2010.499899

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Sensors for detecting and logging spatial distribution of urine patches of grazing female sheep and cattle

Autor: Wendy Griffiths, Mark Carter, D. A. Costall, Keith Betteridge, C. J. Hoogendoorn

Publikováno v: Computers and Electronics in Agriculture. 73:66-73

Urine excreted in patches by grazing livestock accounts for much of the nitrogen (N) loss to the environment in grazing systems. These losses arise mainly through N leaching to ground water and gaseous losses to the atmosphere. Models of grazing syst

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::262700e219d901b5b6815cc4c09b9dd9
https://doi.org/10.1016/j.compag.2010.04.005

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Field radiometer with canopy pasture probe as a potential tool to estimate and map pasture biomass and mineral components: A case study in the Lake Taupo catchment, New Zealand

Autor: D. A. Costall, Ieda Del’Arco Sanches, Yoshio Inoue, M. P. Tuohy, Keith Betteridge, Kensuke Kawamura

Publikováno v: New Zealand Journal of Agricultural Research. 52:417-434

Precision farming requires data on resource status at a very fine, within‐paddock scale which is impractical to collect by traditional sampling methods. This paper demonstrates the potential of a field radiometer in conjunction with a canopy pastur

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::23e2db507034d066c12e3e69ed4a8a78
https://doi.org/10.1080/00288230909510524

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Riparian protection and on‐farm best management practices for restoration of a lowland stream in an intensive dairy farming catchment: A case study

Autor: Donald Shearman, D. A. Costall, Mike R. Scarsbrook, Bruce S. Thorrold, Chris R. Fowles, Robert J. Wilcock, Keith Betteridge

Publikováno v: New Zealand Journal of Marine and Freshwater Research. 43:803-818

Poor water quality (high concentrations of nitrogen (N), phosphorus (P), suspended solids (SS), and faecal bacteria) in Waiokura Stream, southern Taranaki, New Zealand, is attributed to diffuse and point source (PS) inputs from dairy farming. Trend a

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::fbe31458f7cac751885c2ab873d08033
https://doi.org/10.1080/00288330909510042

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Hyperspectral canopy reflectance as a potential tool to estimate and map pasture mass and quality

Autor: Ieda Del’Arco Sanches, Kensuke Kawamura, Yoshio Inoue, Keith Betteridge, D. A. Costall, M. P. Tuohy

Publikováno v: Proceedings of the New Zealand Grassland Association. :189-195

Precision farming requires data on resource status at a very fine, within-paddock scale which is impractical to collect by traditional sampling methods. This paper demonstrates the potential of a modified field hyperspectral radiometer (spectro-CAPP)

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::f0ee08223611c3360af7af10c3d3de85
https://doi.org/10.33584/jnzg.2008.70.2714

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