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Home  »  Gardening Articles  »  Sulphate of Potash

Sulphate of Potash

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A valuable source of potassium for plants Sulphate of potash has a number of uses in the garden, it encourages and improves flowering and fruiting. Used widely with in vegetable gardens, with flowering plants and fruiting trees but much less with other plants. Sulphate of potash is often applied in conjunction with other fertilisers including blood and bone.

Mined in ‘Potash Mines’ this is a valuable fertiliser, so prices are not cheap, however as ‘a little goes along way’ it is economical in terms of production.

Sulphate of Potash also improves disease resistance, promotes root growth and strengthens the cell walls of plants.

Sulphate of potash Application rates

Rates of application will vary according to the product and the use.
For new plantings in vegetable gardens try a quantity of around 40g per square metre, for fruit trees try around 20g per square metre. Best applied by lightly digging or raking into the soil with out disturbing the roots of plants. These rates depend on the product itself so follow directions on the packet.

Tomatoes are often treated with a little sulphate of potash as soon as the seedlings are established, this encourages flowering and hopefully early fruiting

The best time to apply is from early spring to summer.

As an alternative Wood Ash from wood burning fires is also used as a source of potash, however this can be alkaline and raise the pH of the soil.

 

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