Journal article

Simulated seasonal responses of grazed dairy pastures to nitrogen fertilizer in SE Australia: Pasture production

Christie M Karen, Smith P Andrew, Rawnsley P Richard, Harrison T Matthew, Eckard J Richard

AGRICULTURAL SYSTEMS | ELSEVIER SCI LTD | Published : 2018

Abstract

Many nitrogen (N) fertilizer recommendations for grazing livestock enterprises are based on cutting experiments, excluding the influence of recycled N in excreta. Grazing experiments are expensive to conduct, and so compromise on variables such as number of N fertilizer rates, replication and number of years of investigation. Biophysical modelling provides an efficient and effective approach to address many of the complexities of field studies. Our study, using the biophysical whole-farm systems model DairyMod, examined the effect of a range of N fertilizer rates on pasture production for five dairy sites through south-eastern Australia over 18 years under both cutting and grazing regimes. T..

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Grants

Awarded by Australian Government Department of Agriculture and Water Resources as part of its Rural R&D for Profit program


Funding Acknowledgements

The 'More Profit from Nitrogen: enhancing the nutrient use efficiency of intensive cropping and pasture systems' project was supported by funding from Dairy Australia and the Australian Government Department of Agriculture and Water Resources (RRDP1716) as part of its Rural R&D for Profit program. The authors would also like to thank Murray Hannah and Graham Hepworth for their assistance with the statistical analysis.