Malcolm McCaskill

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A mathematical model was developed to predict the release of sulfate from elemental S (S0) and gypsum in single superphosphate. The release algorithm is based on the observation that release is linearly related to particle surface area. Release rates under various conditions could then be described by the change in radius for each time increment, which(More)
Calibration of a model of phosphorus (P), sulfur (S) and nitrogen (N) uptake by a perennial pasture is described. The nutrient model, presented in an earlier paper, is built on soil diffusion theory and plant uptake kinetics, and is set within a larger model which includes soil moisture balance, pasture growth, organic matter cycling and grazing by sheep.(More)
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