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Understanding the role of nitrogen management in apple orcharding to mitigate nitrous oxide emissions


Swarts, ND and Hardie, MA and Oliver, GS and Close, DC, Understanding the role of nitrogen management in apple orcharding to mitigate nitrous oxide emissions, 29th International Horticultural Congress 2014, 17-22 August 2014, Brisbane, Australia (2014) [Conference Extract]


Intensively managed agricultural systems such as tree-crop orcharding can cause rapid oxidation of carbon and nitrogen (N) leading to high CO2 and N2O emissions. Currently there is little data available to estimate GHG emissions from tree-crop systems. We investigated the effect of nitrate application and irrigation on N2O emissions in a 10-year-old ‘Galaxy’ apple orchard in the cool temperate Huon Valley of southern Tasmania. Fertilizer treatments were applied by fertigation in spring (pre-harvest) and late summer (post-harvest) along with high, medium and low rates of irrigation. N20 and C02 were collected from static chambers installed within the tree-line, and in the inter-row of the orchard 0, 30 and 60 mins after sealing the chambers. Gas concentrations were analysed using gas chromatography. Soil moisture and soil and air temperature were monitored daily and N content in leaf, fruit and soil were collected pre- and post-fertigation and at harvest. Results will demonstrate the effect of N application, irrigation, temperature and position within the orchard on GHG emissions. Optimising fertilizer rate and timing in combination with irrigation management provides potential for reducing N2O emissions in temperate tree production horticulture.

Item Details

Item Type:Conference Extract
Keywords:nitrous oxide, nitrogen, apples, cherries, fertigation
Research Division:Agricultural, Veterinary and Food Sciences
Research Group:Horticultural production
Research Field:Horticultural crop growth and development
Objective Division:Environmental Management
Objective Group:Air quality, atmosphere and weather
Objective Field:Atmospheric composition (incl. greenhouse gas inventory)
UTAS Author:Swarts, ND (Dr Nigel Swarts)
UTAS Author:Hardie, MA (Mr Marcus Hardie)
UTAS Author:Close, DC (Professor Dugald Close)
ID Code:102116
Year Published:2014
Deposited By:Tasmanian Institute of Agriculture
Deposited On:2015-07-29
Last Modified:2015-07-29

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