Sulphate of Potash
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The best and safest way to add potash to soils and composts. It also contains useful amounts of sulphur. Potassium is essential to all plants, imparting flavour to tomatoes, colour to flowers and aids ripening of all types of fruit.
Rate of use: 1 oz per sq.yd (34g per sq.m).
Potassium Oxide K2O 50% (K41.5%) (Soluble in Water)