Treatment of lemon tree at the time of flowering

Hi Trishanku Mondal. Check for Magnesium Deficiency, Thrips and Citrus Butterfly . Click on green link for knowing symptoms and taking control measures from Plantix library. Don't do overwatering and direct watering on plant. Even don't allow soil to become water logged. Make a hole below the pot to drain out excessive water from the pot. Apply good amount of Farm Yard Measure or Vermicompost once in 6 months to get good plant growth and yield. Also use fertilizer calculater and weather report to get good growth of your plant.