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COMMERCIAL SUBIRRIGATION IN GRAVEL
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acid ammonium Ammonium sulphate antirrhinum asbestos-cement automatic beds bitumen bitumen paint bricks calcium Calcium nitrate carnations cent Chapter chemical chrysanthemum climatic colour commercial concentration concrete corms cost crops cuttings diameter Dieldrin drainage channel dry-feed feed feet flat-dweller flowers formula fresh fungal gallons garden germination gladioli glass grammes gravel Gravel sub-irrigation greenhouse growing medium growing plants grown growth holes humidity hydroponic grower hydroponic installation hydroponic method hydroponic nutrient hydroponic tank inches irrigation J-inch labour layer leaves lettuce light liquid Magnesium Magnesium sulphate material mixture moisture molecular necessary nitrate nitrogen nutrient powder nutrient solution Oranjemund particles pH value phosphate phosphorus Photograph pipe plant nutrient Potassium Potassium nitrate produce pump reservoir salt seed-trays seedlings seeds slab soil spraying staking sterilization sub-irrigation suitable sulphate sulphuric sulphuric acid superphosphate surface temperature time-clock tomato trace elements transplanting tubes valve vegetables ventilation vermiculite wind window-box