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aeration amateur gardener Ammonium sulphate ample applied beetroots beginners bucket Bulbs calcium Canary Islands CHAPTER cinders crops cucumbers cultivation damp drainage holes Endive feeding fertiliser salts flowers and vegetables formula fresh fruits germination Gran Canaria gravel green greenfood greenhouse growing medium grown growth home garden home hydroponic horticultural household humidity hydro hydroponic containers hydroponic garden hydroponic plants hydroponic trough hydroponic units indoor irrigation kitchen lettuce light liquid manures material mesh methods of hydroponics mineral salts mixture moist moisture mushrooms normally nutrient solution ounce P.O. Box plant food plants growing plastic polythene polythene sheeting ponic produce quantities receptacles roots Saanichton salads sand Sassari saucer seeds shading soilless compost soilless culture soilless gardening sowing sown Spa1n spray stems Sub-irrigation sulphate Superphosphate supply surface tank technique temperature tomatoes transplanted trays trough or bed troughs or containers types vermiculite warmth West Bengal