Depth for hilling differs between varieties. Cultivation Potatoes develop larger and more extensive root systems in response to proper cultivation. Cultivation may be necessary to control weeds, keep soil hilled-up and aid water penetration and soil aeration. Cultivate only when needed. Deep cultivation should be avoided since many roots are destroyed.
Extra cultivations are expensive, increase soil compaction and reduce yield.
By the time plants reach full bloom cultivation should cease. Weed Control Weeds should be controlled in potato fields since they cause many problems besides being hosts for insects and diseases. An effective weed control program takes into account the weed problem, cultivation and herbicides. Fields containing perennial weeds should be avoided. When herbicides are used, the choice of which one or ones to use should be tailored to the specific weed problems and when these weeds germinate.