From WikiGarden

Tilling, the ploughing or cultivation method that turns over the soil, buries the weed beneath the soil. This provides a barrier to the sun, therefore killing the weeds. Tilling is a form of physical control that can be easily undertaken over a wide area, using agricultural machinery. This method is useful for making soil ready for planting new crops, but it can lead to damage in soil structure and exposes the soil to erosion and further invasion by weeds.

Physical control : taken from - http://www.environment.gov.au/biodiversity/invasive/weeds/management/physical-control.html http://creativecommons.org/licenses/by/3.0/au/deed.en © Commonwealth of Australia 2017