Question: query regarding slow growth of pumpkin. 
Answer: apply azotobacter and phosphatika  6gram per liter of water near the root zone and also spray by covering the whole plant or spray npk 19:19:19, 10 gram per liter of water 2 times at 15 days interval in the evening time at flowering and fruit setting.  after complspray one vitamins like mohaphol/biovita/sagorika 2ml/liter of water at 15 days interval in the evening time.