Modelling grassland production and utilization

B.W.R. Torssell

Modelling grassland production and utilization

In: Grassland and Society

Author:

B.W.R. Torssell

B.W.R. Torssell Dept. of Crop Production Science, Swedish University of Agricultural Sciences, Box 7043, S-75007 Uppsala, Sweden

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Type:: Chapter

Pages:: 503–514

DOI:: https://doi.org/10.1163/9789004684409_095

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Summary

Model developments in eight different modules of grassland-animal production systems are reviewed. The importance of linking different modules more closely together is pointed out, e.g. plant development with digestibility, species population dynamics with nitrogen balance, nitrogen balance with plant protein content, digestibility with forage intake, and forage intake with animal production. The combination of all these links into the “ultimate” model has yet to be achieved.

Modelling grassland production is seen as a search for process understanding and prediction in strategic or tactical planning. For the first purpose, complex, mechanistic models have been developed. For planning, simpler models are often applied. Although the aim in strategic planning is to use a set of general parameters, we are often forced in tactical planning to calibrate the models for specific situations. Validation of large systems models imposes problems because of experimental costs. We may therefore be left with the possibility of continuously challenging the model against reality.

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Grassland and Society

Proceedings of the 15th General Meeting of the European Grassland Federation, June 6-9, 1994

E-Book ISBN:: 9789004684409

Publisher:: Wageningen Academic

Print Publication Date:: 01 Jan 1994

Subjects
- Life Sciences
  - Animal & Veterinary
  - Agriculture & Environment

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Modelling grassland production and utilization

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Grassland and Society

Proceedings of the 15th General Meeting of the European Grassland Federation, June 6-9, 1994

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