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Performance of a fertiliser management algorithm to balance yield and nitrogen losses in dairy systems

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  • Cichota, Rogerio
  • Vogeler, Iris
  • Werner, Armin
  • Wigley, Kathryn
  • Paton, Brittany

Abstract

To demonstrate the use of a previously developed fertilisation algorithm and to determine its potential effects on nitrogen (N) losses from grazed pastoral systems, a simulation study was performed using the Agricultural Production Systems Simulator (APSIM). The study considered a dairy system with irrigated ryegrass pasture on a silt loam soil in the Canterbury region of New Zealand. Firstly, the algorithm was parameterised for each month based on pasture yield and N contents from simulation run over 20 years using a wide range of N fertilisation rates. The algorithm was then used in the simulation of fertilisation management of a hypothetical dairy farm under different scenarios where its performance for increasing pasture yield with more efficient N use was tested. The scenarios were based on different yield targets for the proposed algorithm (50, 75, 90 or 100% of the average maximum yield) and included scheduled fertilisation to mimic more typical management. For more realistic evaluation, the simulations took into account changes in stocking rates and N flows in the farm resulting from the different fertiliser management. The simulations also considered the uneven return of urinary N by grazing animals, which are crucial to determine N losses in these systems.

Suggested Citation

  • Cichota, Rogerio & Vogeler, Iris & Werner, Armin & Wigley, Kathryn & Paton, Brittany, 2018. "Performance of a fertiliser management algorithm to balance yield and nitrogen losses in dairy systems," Agricultural Systems, Elsevier, vol. 162(C), pages 56-65.
    • Handle: RePEc:eee:agisys:v:162:y:2018:i:c:p:56-65
    DOI: 10.1016/j.agsy.2018.01.017
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    References listed on IDEAS

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    1. Probert, M. E. & Dimes, J. P. & Keating, B. A. & Dalal, R. C. & Strong, W. M., 1998. "APSIM's water and nitrogen modules and simulation of the dynamics of water and nitrogen in fallow systems," Agricultural Systems, Elsevier, vol. 56(1), pages 1-28, January.
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