long been used as a "weed-killer" because salt was known to destroy plant life quite well (Dreiling, 2017). Only in the beginning of the 20th century, the modern ways of chemical treatment for weed control have begun with the introduction of effective synthetic herbicides. Chemical weed control has gradually become a viable alternative for laborious mechanical weed removal (Kelton & Price, 2011). In addition, the application of herbicides using a tractor-pulled spraying system significantly reduced the labour burdens associated with the weeding. Nowadays with the advent of automation and precision agriculture technologies, site-specific weed management is becoming feasible. In site-specific weed management, i.e. differentiated application of herbicides on an individual plant level provides an efficient way to minimise herbicide costs and environmental impact.