Thestartingpointfordevelopmentofthemachineryconceptwasfieldexperiments,whichshowedthatitwithregardstogrowthwassufficienttocontrolweedswithinacircleof40cmradiusaroundeachtree.Thiscorrespondstoabout40%ofthetotalarea.

Please segment the words:
The starting point for development of the machinery concept was field experiments, which showed that it with regards to growth was sufficient to control weeds within a circle of 40 cm radius around each tree. This corresponds to about 40 % of the total area.