Matthew Irwin

Matthew Irwin
Massey University · Institute of Agriculture and Environment

Master of Science

About

13
Publications
1,549
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89
Citations

Publications

Publications (13)
Article
Full-text available
Aerial topdressing – the aerial application of fertilisers over farmland using specialist agricultural aircraft – is an integral part of New Zealand’s agricultural heritage. The procedure was born and developed there, so it makes sense that New Zealand researchers are behind much of its development. Dr Miles Grafton and Matthew Irwin from Masse...
Article
Full-text available
Machine learning techniques to measure grapevine water status from proximal hyperspectral sensing.
Article
This work measures the effectiveness of boundary delivery from a new computer-controlled aircraft bulk solid delivery system (Intellispread +). Computer controlled delivery of solid fertilisers by aircraft has been practised commercially in New Zealand since 2014. Aircraft position is determined in relation to a rate change polygon, aircraft ground...
Article
Full-text available
Rapid land use change has taken place in many neighboring provinces of the capital of Vietnam such as Thai Nguyen province over the past 2 decades due to urbanization and industrialization. Deriving accurate and updated land cover and land-use change information is essential for the environmental monitoring, evaluation and management. In this study...
Article
Full-text available
Treading damage inflicted by grazing animals degrades soil physical quality, increases sediment and nutrient loss to water, and reduces pasture yield. The extent or severity of treading damage can be assessed using several methods such as roller chain, depth of pug, and visual scoring. However, the ability of these methods to assess treading damage...
Conference Paper
Full-text available
Pasture quality is a critical determinant which influences animal performance (live weight gain, milk and meat production) and animal health. Assessment of pasture quality is therefore required to assist farmers with grazing planning and management, benchmarking between seasons and years. Traditionally, pasture quality is determined by field sampli...
Article
Hyperspectral sensing using ground-based equipment has been demonstrated to be successful in determining pasture nutrient content (N, P, K, S) and parameters such as dry matter content and metabolisable energy. This technology needed to be up-scaled so that large areas could be rapidly covered with adequate spatial resolution. This paper describes...
Article
After almost 80 years of quiescence, the upper Te Maari vent on Mt. Tongariro erupted suddenly at 2352 hrs (NZ time) on 6 August 2012. The short-lived hydrothermal eruption distributed a fine ash of minor volume (~ 5 x105 m3) over 200 km from source. The threat of further eruptions prompted an investigation of the possible health and agricultural i...
Article
Conference title - IUGG XXIV general assembly, Copyright - GeoRef, Copyright 2012, American Geosciences Institute., Date revised - 2011-01-01, Language of summary - English, Pages - Abstract 6978, ProQuest ID - 840344052, SubjectsTermNotLitGenreText - Australasia; dams; debris flows; deposition; geologic hazards; lahars; mass movements; New Zealand...
Conference Paper
Ruapehu lahars are typically derived from eruptions or outbursts from the hydrothermally heated Crater Lake. Hence the chemical contrast of this pulse of acidic brine into normal streamflow can be used, alongside sediment concentration and flow stage/discharge to understand the interaction of lahars and river water in their path. Observations of er...
Conference Paper
It has long been recognized that pasture production in New Zealand’s hill country, beef and sheep sector, is highly variable. Annual pasture production on individual farms typically varies between 4,000 to 11,000 kg DM ha-1. The terrain is often difficult to access and travel on with wheeled vehicles, this lead to the use of topdressing aircraft fo...

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