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acid acre aeration aggregate Agricultural Ammonium nitrate Ammonium phosphate Ammonium sulphate applied areas average basic mixture Bengal method Bengal system Calcium cyanamide Calcium nitrate Calcium sulphate Calcutta carbon chapter chemicals chloride commercial compound containing crops cultivation of plants drainage dram employed experiments FERTILIZER SALT flowers formulae gallons garden grower growing medium growing plants grown horticultural hydro hydroponic trough hydroponicist hydroponics hydroponicum inches India installation irrigation Kalimpong lettuce Magnesium sulphate Manganese Monopotassium phosphate monsoon mud plaster Muriate necessary nitrogen normal nutrient nutrient mixture nutrient solution obtained operator ounce oxygen oz Ammonium oz Calcium oz Magnesium sulphate pests ponic potash Potassium nitrate Potassium sulphate practical produced quantities reader Research resins roots sand season seedlings seeds slow-release Sodium nitrate soil soilless culture soilless growth sowing suitable Sulphur Superphosphate Sustanum system of hydroponics system of soilless tablets technique tomatoes trace elements United various vegetables West Bengal yields