ammonium sulphateSulphur 24% Nitrogen 21%

Southern Grade

Grey white crystalline powder. Hygroscopic in nature so must be stored under cover and away from moisture to retain free-flowing characteristic. The product is likely to have lumps, which will break up relatively easily with a front-end loader. Must be broadcast and spreads up to a width of 8m

Western Grade

Free flowing coarser product, no lumps 1 – 3mm Can be augered and if spread, spreads to a width of 14-16m.

Premium Grade

Free flowing coarser product, no lumps 3 – 4mm Can be augered and if spread, spreads to a width of 16-24m.

Ammonium Sulphate is a by-product of steel. It is made by treating the by-product from the coke ovens with Sulphuric Acid.

COMPARISON OF ROOT PROLIFERATION DUE TO FERTILISER BANDING

Subject

Consequences of banding nitrogen fertiliser in the soil. Effects on the growth of wheat roots.

Introduction

When a solid fertiliser is placed in a band in the soil, the fertiliser is dissolved and subsequently moves out to interact with the soil in various ways. Some aspects of this interaction, including effects on nitrification are compared between two fertilisers:- Urea and Ammonium Sulphate.

The importance of sulphur

Sulphur ranks in importance with nitrogen in the formation of protein. Other benefits include improved resistance to cold damage and disease infestation.

In cropping situations sulphur deficiency is usually reflected in its protein content as well as its type of protein. Sulphur supply affects the make-up of amino acids in plants. In those well supplied with sulphur, cystine is the dominant amino acid present while in sulphur deficient plants methionine becomes dominant.

With limits the proportion of methionine in the total amino acids is a measure of the quality of the proteins. The role of sulphur in plants is in the synthesis of certain amino acids, thus the make-up of protein for enzyme activity, the production of certain enzymes and for various metabolic processes.

Foliar sprays vs soil granular fertilisers

Urea

  • Is very volatile. Losses to the atmosphere can be considerable and very costly.
  • Is prone to leaching. This causes considerable loss of calcium and other nutrients down the soil profile. Very costly.
  • Acidification. The leaching of N is very acidifying to the soil.
  • Adverse physical effect on soil. Leaching of calcium causes loss of desirable soil conditions.
  • Toxic. Conversion through the nitrite stage can be toxic to soil biota for up to 8 weeks.
  • Losses as outlined need to be accounted for when determining crop N needs.
  • Generally assumed to be 30% - 50% efficient.
  • Long term – slow degradation of soil characteristics.
  • Application should only be in small amounts which the crop can immediately use for a quick response.

Ammonium Sulphate

  • Sulphur ranks in importance with nitrogen in the formation of protein.
  • Other benefits include improved resistance to cold damage and disease infestation
  • In cropping situations sulphur deficiency is usually reflected in its protein content as well as its type of protein. Sulphur supply affects the makeup of amino acids in plants.
  • Those well supplied with Sulphur, cysteine is the dominant amino acid present while in sulphur deficient plants methionine becomes dominant.
  • Non-volatile.
  • Much less prone to leaching.
  • The role of sulphur in plants is in the synthesis of certain amino acids and thus the make up of protein for enzyme activity, the production of certain enzymes and for various metabolic processes.

Soil Management Systems Conditioning Machine and loading elevator at the Onesteel Whyalla Sulphate Shed. Fresh Ammonium Sulphate in the foreground.

Soil Management Systems Conditioning Machine and loading elevator at the Onesteel Whyalla Sulphate Shed. Fresh Ammonium Sulphate in the foreground.

Ammonium sulphate and DAP

Year: 2001Location: Coomooroo — N.W. of Orroroo
History: Wheat after wheatTillage: Minimum cultivation
Fertiliser 40kg/ha DAP No Ammonium Sulphate Yield 1.6 T/Ha
Fertiliser 40kg/ha DAP+100kg/ha Ammonium Sulphate Yield 2.8 T/Ha
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