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A section of the installation
Old petrol drums converted into hydroponic unit
The famous actress Jessie Matthews admiring a balcony stand
80 other sections not shown
40 gallons acid acre aggregate Ammonium areas Aruba beans bitumen bottle built Calcium Nitrate carnations cement cent chelates chemicals chloride chlorosis colour commercial installations concrete cost crops cucumbers cuttings deficiency diluted distilled water economical Elektroflora farm feeding feet flowers Formula garden give glass gravel culture growers growing grown growth heat hydroponic inches iron Johannesburg leaves lettuce light Magnesium Sulphate Manganese maximum method mixture moisture nitrogen nutrient solution obtained operation Phosphate pipette plastic polythene possible potassium Potassium Nitrate Potassium Sulphate potatoes produce pump quantities rainfall reagent reservoir roots salts sand seed seedlings sodium Sodium Nitrate soil soil-less culture South Africa standard stone sub-irrigation Superphosphate supply surface Sweden Table tank temperature tomatoes Trace Element trays tubes varieties vegetables vermicuhte Vermiculaponics vermiculite wall Wankie Colliery washed yield