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Application of probability analysis to assess nitrogen supply to grain crops in northern Australia

Kelly, R.M. and Strong, W.M. and Jensen, T.A. and Butler, D. (2004) Application of probability analysis to assess nitrogen supply to grain crops in northern Australia. Precision Agriculture: An International Journal on Advances in Precision Agriculture, 5 (2). pp. 95-110.

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Article Link(s): http://dx.doi.org/10.1023/B:PRAG.0000022356.01537....

Publisher URL: http://www.springerlink.com

Abstract

Grain yield and protein of cereal crops in northern Australia provides a useful indicator of the supply of available nitrogen (N) to the crop. Our intention was to utilize these principles on a site-specific basis through an associated probabilistic framework to identify the likelihood that grain yield was limited by N supply. Yield and protein data were taken at harvest from sorghum, wheat and barley crops near Dalby, southern Queensland, in 1999. Considerable variation was found in grain yield for the 3 crops, but less so for grain protein. Frequency-response relationships, derived from historical multiple N field experiments, were applied to identify areas where grain yield was limited by N supply. This approach indicated that there was a 60% or higher likelihood that plant-available N was yield-limiting for 17, 23, and 26% of the area sown to sorghum, wheat and barley, respectively. These areas were not necessarily those where crop yield was relatively low. Calculation of N removal and N supply, using N transfer efficiency relationships, verified that those areas with a high likelihood of response to N had considerably lower supplies of N compared to other areas. The application of probability analysis offers a unique strategy to identify within-field areas where N supply could be yield-limiting, and provides a rationale for predicting the spatial variation and likely range of N supplies for successive seasons.

Item Type:Article
Corporate Creators:Department of Employment, Economic Development and Innovation (DEEDI), Agri-Science, Crop and Food Science, Plant Science
Business groups:Agri-Science, Crop and Food Science
Additional Information:© Springer.
Keywords:Precision agriculture; grain protein; geographical information systems; site specific nitrogen management; grain protein variation; likelihood mapping; grain nitrogen; nitrogen supply; yield mapping.
Subjects:Plant culture > Field crops > Grain. Cereals
Agriculture > Agriculture (General) > Fertilisers
Deposited On:22 Jan 2009 05:35
Last Modified:25 Oct 2011 04:44

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