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3J oz acid acre aeration aggregate Agricultural Ammonium nitrate Ammonium phosphate Ammonium sulphate areas basic mixture Bengal method Bengal system bonemeal Calcium chloride Calcium cyanamide Calcium nitrate Calcium sulphate Calcutta carbon chapter chemicals chloride commercial compound containing crops cultivation of plants drainage dram essential experiments FERTILIZER SALT flowers formula gallons garden grower growing medium grown horticultural hydro hydroponic trough hydroponicist hydroponics hydroponicum inches India installations intercropping Kalimpong lettuce Manganese Monopotassium phosphate monsoon mud plaster necessary nitrogen normal nutrient nutrient mixture nutrient solution obtained operator ounce oxygen oz Ammonium oz Calcium nitrate oz Magnesium sulphate oz Monopotassium phosphate oz Potassium nitrate oz Superphosphate pests plant growth ponics Potassium nitrate Potassium sulphate powder practical produced quantities reader roots sand season seedlings seeds Sodium nitrate soil soilless culture soilless growth sowing suitable Sulphur system of hydroponics system of soilless tablets tomatoes trace elements vegetables yields