Show explaining purpose of use of corn cultivator TJ T main purpose of corn cul tiva to kill weeds and if it can be done without aerating the soil too much or disturbing the roots of the young corn plants the more successful the crop will be stata iowa state college investigators contrary to general belief they find cultivation does not keep water in the soil it does kill weeds that would use moisture however the roots of the corn plant are located in the first six or seven inches of soil it Is in this layer of soil that the most nutrients are found foun d summer rains of one quarter to an inch moisten only about three inches of soll eoll stirring ot of this layer aerates and dries out the soil and prevents the roots frosti securing food and moisture the theory that water moves upward through the soil capillary system from great depths beneath the surface has been disproved |