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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

Sprinkle a handful of sulphate of potash fertiliser around the base of fruit trees and bushesPlant new raspberry canes and blackberry plantsPrepare beds to plant asparagusPlace tunnel cloches or simple sheets of polythene over beds to warm soil

artichokes as a windbreak on exposed plotsSprinkle sulphate of potash fertiliser around fruitSow seeds of broad beans, carrots, hardy peas and parsnips outside in soil that's been warmed with cloches

to feed raspberries. You can apply sulphate of potash in powdered form (35g or 7 teaspoons per square metre) to the soil at the start of the month, then a couple of weeks later add a covering of well-rotted manure or home-made compost. This helps to keep

shoots 10cm high, apply sulphate of potash at 100g per square metre.March: Continue weeding and hoeing but take care not to damage bulbs. Planting may continue though bulbs will be smaller.April: Keep up regular watering in dry weather. Use a fungicide