... and frequency from one-dimensional con- HETT~ARATCH~, D,R,P, & OcALLAGHAN, J,R, 1978, solidation data -a mathematical model. Plant and Structural mechanics of plant cells. Journal ... Maximum axial and radial growth pressures of plant roots, Plant andSoil95,315-326. Moss, G.I., HALL, K.C. and JACKSON, M.B. 1988. Ethylene and the responses of roots of maize (Zea mays ... It has been suggested by Abdalla et al. (1969) that roots penetrate soil by an alternating series of radial and axial enlargements. Graf & Cooke (1980) used a finite-element model and, ...