If onion's vegetative growth is less then 19:19:19 water soluble fertiliser should be dissolved in 1 kg per acre in 200 liters water and sprayed 15, 30 and 45 days after transplanting. After this, spraying 13:0:45 water soluble fertiliser 1 kg per acre in 200 litres of water and spraying it 60, 75 and 90 days after transplanting.