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Sustainable improvement of sandy soil: improves water and mineral retention. This gives sand clay-like properties! This improves the structure of sandy soils, and the soil dries out less quickly. Can be used all year round. 2½ kg is for 5-25 m². Composition: 0.5% Potassium oxide + 0.01% Zinc + 40mg/kg Nickel + 30mg/kg Cobalt.