System analysis of 35sulphur kinetics in pastures grazed by sheep.

Published online
07 Jul 1972
Content type
Journal article
Journal title
Journal of Applied Ecology

May, P. F. & Till, A. R. & Cumming, M. J.

Publication language


A mathematical model representing the S cycle in a grazed pasture was programmed on to an analogue computer to simulate the results of a field experiment in which observations were made on the incorporation of radioactivity into wool following a single application of [35S] gypsum to pasture. The results showed that the specific activity of wool was consistent with a closed-system recycling process involving c 60% of the total S in the system, and that up to 90% of the cycling S was probably held in organic residues in forms not directly available to plants.

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