control weeds

[kanagasundar]

Hi all,
How to control weeds? I have some idea. I like to share with all. All of us give our opinion as soon as possible

In ancient times,we had used some methods like panchakavya, organic manure to control weeds. Now our technology is well propped. Is any technique identify chemical compounds in panchakavya, organic manure etc.., Is that's identify chemical compounds manipulate through biotechniques? If manipulaed, which technique is favor? What is he successful rate of this application? Please give your opinion as soon as possible
Thank you to all