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aeration aggregate culture amateur gardener ammonium sulphate ample applied beginners boxes bucket Bulbs calcium centimetres crops cultivation damp drainage holes eelworms employed Endive feeding fertiliser salts flowers and vegetables formula fruits Gericke germination gravel green greenfood greenhouses growing medium growing plants grown growth home gardeners home hydroponic horticultural household humidity hydroponic containers hydroponic gardens hydroponic plants hydroponic units hydroponicists Imperial Chemical Industries indoor Iron sulphate irrigation kitchen lettuce light liquid litres manures material mesh mineral salts mixture moist moisture mushrooms normally nutrient solution Phostrogen plant food plants growing plastic polythene polythene sheeting ponic Potassium nitrate produce quantities receptacles roots salads sand saucer seeds shading Sholto Douglas soilless compost soilless culture soilless gardening sowing sown spray stems Sub-irrigation sulphate Superphosphate supply surface tank technique temperature tomatoes trays trough or bed troughs or containers types vermiculite warmth