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Assessing the risk of nutrient loss under intensive crop production in the Panatana Catchment, Tasmania, Australia

Citation

Cotching, WE and Lisson, S, Assessing the risk of nutrient loss under intensive crop production in the Panatana Catchment, Tasmania, Australia, ASA, CSSA and SSSA International Annual Meetings, 16-19 October 2011, Texas USA (2011) [Conference Extract]

Abstract

The Panatana catchment in central north Tasmania, Australia (~4112S, 14626E) is one the most intensively cropped catchments in the state due to a favourable climate, productive soils and ready access to various agricultural processing and port facilities. The high rates of irrigation and fertiliser use in the catchment, combined with typically high annual rainfall totals and soils that have high infiltration rates and rapid permeability, create conditions that are conducive to high drainage and nitrogen leaching losses below the root zone. This paper reports on desktop modelling studies of the impact of current management practices on the N balance under intensive vegetable-based cropping in the Panatana catchment. Modelling was also used to identify feasible and viable practices for reducing N loss. Crop water supply was found to exceed crop water use for all crops grown across the 7 crop-based case farms resulting in substantial (i.e. >100 mm) average seasonal drainage figures for each crop. Crop N demand is close to crop N supply for all rotation elements with the exception of potato which has an average surplus of 89 kg N/ha. As a consequence, potato has the highest rate of N loss of 29 kg N/ha (up to 4X greater than other crops). Modelling showed that practicable management options such as deficit-based irrigation and reduced N fertiliser rates have the potential to generate significant financial savings via reduced input costs and reductions in offsite N loss, while maintaining current levels of productivity.

Item Details

Item Type:Conference Extract
Research Division:Agricultural and Veterinary Sciences
Research Group:Agriculture, Land and Farm Management
Research Field:Agricultural Land Management
Objective Division:Environment
Objective Group:Land and Water Management
Objective Field:Farmland, Arable Cropland and Permanent Cropland Land Management
Author:Cotching, WE (Dr Bill Cotching)
Author:Lisson, S (Dr Shaun Lisson)
ID Code:73092
Year Published:2011
Deposited By:TIA - Research Institute
Deposited On:2011-09-12
Last Modified:2014-04-07
Downloads:0

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