Working beyond our limits in our maize farm after closing from school

Initially we decided to use herbicides but we later saw that there are plenty of cocoyam which have emerged in the farm. The cocoyam too are source of root tuber and the leaves being great sources of vitamin, iron and energy due to high fibre content. Using herbicides would turn to kill all the cocoyam in the farm. So we took a decision to at least weed the vantage places where these cocoyam have converged, even if not all the whole farm.