Question: query regarding use of herbicide before planting of chilli . 
Answer: you can use roundup (glyphosate) 2 ml/liter befor 10-12 days of planting, and mix azotobacter or azospirilum 4 kg per 200 kg of cowdung and keep it overnight and on the nextday mixed with soil before 3 days of planting.

phone number of principal scientist of kishi vigyan kendra dibrugarh-9435564391- dr.hiranya kr. bhattachariya