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. gblair@une.edu.au

Abstract

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.

 

Host

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.

Photo Credits

David Marland Photography david_marland@hotmail.com Southern Farming Systems Agriculture Victoria

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