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acid aeration AGGREGATE CULTURE Agricultural Ammonium phosphate Ammonium sulphate areas basic mixture beds Bengal method Bengal system butylite Calcium cyanamide Calcium nitrate Calcium sulphate carbon chemicals chloride commercial compound containing Copper sulphate crops drainage dram employed essential experiments fertilizer salts flowers formula gallons garden grower growing medium growing plants grown horticultural hydro hydroponic trough hydroponic unit hydroponicist hydroponics hydroponicum inches India installation Institute irrigation Kalimpong layflat lettuce Magnesium sulphate Manganese manure method of soilless mineral mixed Monopotassium phosphate monsoon mud plaster nitrogen normal nutrient nutrient mixture nutrient solution nutrition obtained operator ounce oz Magnesium sulphate oz Potassium plant growth ponics potash Potassium nitrate Potassium sulphate practical produced quantities reader roots sand seedlings seeds Sodium nitrate soilless culture soilless growth soilless unit square Sub-irrigation suitable Superphosphate supply system of hydroponics tank technique tion tomatoes trace elements University various vegetables West Bengal yield Zinc sulphate