Sulfur availability from elemental S coated fertilisers

Joachim Pitala1, Graeme Blair2

1 PNG University of Natural Resources and Environment, Agriculture Department, PMBS, Kokopo, East New Britain Province
Papua New Guinea
2 Agronomy and Soil Science, School of Environmental and Rural Science, University of New England, Armidale, NSW, 2350. email.


A glasshouse study was undertaken on an sulphur (S) deficient soil to examine the availability of S to flooded rice when elemental S (S) was coated by various means onto the surface of triple superphosphate. The experiment consisted of a factorial combination of 6 sources of fertiliser S materials [Goldphos10 (GP10), UNE1, UNE2, TSP+Sf, TSP+Sm and TSP+Sc, and a control] with 3 replications. A straw and grain yield response was recorded for all fertilisers. Among the fertilisers GP10 produced a significantly lower grain yield, tops S content and fertiliser S recovery than the other fertilisers. Although no significant difference in straw or grain yield was recorded between the different S particle size coatings there was a lower S content and % fertiliser S recovery in the coarse treatment compared to the fine and medium. The lower yield with GP10 compared to the fertilisers coated with a similar particle size elemental S (TSP+S°f, TSP+S°m) suggests that the chemical binding used to produce GP10 inhibited S oxidation.



The Australian Society of Agronomy is the professional body for agronomists in Australia. It has approximately 500 active members drawn from government, universities, research organisations and the private sector.

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David Marland Photography Southern Farming Systems Agriculture Victoria

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