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Soil Indexes
Sulphur Index Lab Range [mg/l] Comment
Zero 0 - 10 Severe deficiency likely in susceptible crops: Treatment essential
One 11 -22 Deficiency likely in susceptible crops: Treatment Desirable
Two 23- 37 Precautionary Applications considered
Three 38 - 51 Satisfactory Sulphur levels
Four 52 -  

Treatment

Sulphur can be added to most blended fertilisers and also supplied as a straight. See the related articles for materials containing sulphur.

Do NOT mix yellow granular sulphur with Ammonium Nitrate to create a diy nitrogen/sulphur mix. The result could be explosive.

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J & H Bunn
A Koch Fertilizer Subsidiary