Application of a changing field of growth rates to a description of root apex formation. 
Based on the growth tensor method an unsteady field of growth rates for developing root apex is presented.  Maps of growth rates distribution as well as simulations in which the field was applied to initially uniform grid of points are presented.  In the simulations, the grid undergoes deformation that resembles new root formation in its axial plane.  Four variants of field operation on the grid are shown.