Weeds reduce farm and forest productivity, they invade crops, smother pastures and in some cases can harm livestock. They aggressively compete for water, nutrients and sunlight, resulting in reduced crop yield and poor crop quality.
Certain classes of weeds share adaptations to ruderal environments.soil or natural vegetative cover has been damaged or frequently gets damaged, disturbances that give the weeds advantages over desirable crops, pastures, or ornamental plants.
- competing with the desired plants for the resources that a plant typically needs, namely, direct sunlight, soil nutrients, water, and space for growth.
- providing hosts and vectors for plant pathogens, giving them greater opportunity to infect and degrade the quality of the desired plants.
- providing food or shelter for animal pests such as seed-eating birds and Tephritid fruit flies that otherwise could hardly survive seasonal shortages.
- causing root damage to engineering works such as drains, road surfaces, and foundations,blocking streams and rivulets.
Weed control is important in agriculture. Methods include hand cultivation with hoes, powered cultivation with cultivators, smothering with mulch or soil solarization, lethal wilting with high heat, burning, or chemical attack with herbicides.
Weed control methods vary according to the growth habit of the weeds.Perennial weeds regrow from previously established roots, dormant stolons, tubers, rhizomes, as well as the seed.important for non-chemical methods of weed control, such as plowing, surface scuffling, promotion of more beneficial cover crops, and prevention of seed accumulation in fields
Weeds unwanted plant for all.