- - a swelling clay that helps to hold water and nutrients in the soil. Apply 100 grams per square metre. Dig into the soil about 25 to 30 cm.
- is a good all round organic fertiliser at a generous handful per square metre. Dig into the soil about 25 to 30 cm.
- AKA ground rock dust, contains trace elements and is applied at the rate of 100 grams per square metre. Dig into the soil about 25 to 30 cm.
- to deal with water-repellent soil. 250 ml usually covers 50 square metres.
- - a form of calcium - can be placed thickly on the soil surface at the rate of ½ to 1kg per square metre, then dug in. The gypsum forces the clay particles to cling together and form a crumb-like structure. However, this doesn't work with all clays - check if it will help your soil here:
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