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deficiency. Sulphate of potash cures potassium deficiency. For low phosphorous levels, apply super-phosphates. Top up manganese levels with Epsom salts.raspberriesspring, summer, autumnMore advice on growing raspberriesMaking the most of summer raspberries
The second component of NPK. Phosphates may be sold as rock phosphate, super phosphate or triple super phosphate. Occurs naturally in banana skins, bone meal and dried blood.