I spray herbicide (nomini gold) to control weeds though the weeds were controlled in paddy field but the leaf colour slightly changes to yellow colour in the tip of the leaves

Hi Pasupathi That's not due to herbicide. It seems to beLeaf Scald of Rice Click on green link for checking symptoms and taking control measures from Plantix library🌾

Potassium deficiency.

If you click on the green hyperlink that takes you to Plantix Library where everyone can find details on this problem and control measures. 🤠🌱

This syrup has insecticidal and fungicidal action. Ingredients: 100 g black pepper, 100 g crushed garlic 1 liter of alcohol Extract Method: Mix ingredients and let enjoying for a week. Application: Before applying, the extract must be diluted in water at 1%. This means that you should add 1 L of water for every 10 mL of pepper extract. The slurry can be applied 1 time a week. precautions: Apply immediately after preparation. Do not spray during the hottest hours of the day. Comments: If you are certified organic farmer, before applying any kind of syrup, extract or product, contact your certification. Recipe developed by: Luiz Geraldo Carvalho Santos