Question: query regarding how to improve the growth of watermelon plants. 
Answer: --spray the combisal fungisige 2 gram/liter of water 3 times at 7 days interval and poundi insecticide 2ml/liter of water  3 times at 7 days interval. use both the medicin by maintaining 3 days gap between them in the evening time, in the absence of rain. after complition of this spray one vitamins like- mohaphol/sagorika/biovita 2 ml/liter of water at 15 days interval continously up to the end of the season.