You can not weed a "pdf" file.
The advantage of hand weeding is that you only remove the weeds and if you are careful not the plants you want to remain. The disadvantage is that on a large plot it is more time consuming than mechanical means.
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The advantage of using chemicals to kill insects and weeds is speed, cost and ease of application. The disadvantage of chemicals is overspray and runoff, as well as the lingering chemical on the produce.
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