EFFECT OF COMPACTION ON PHYSICAL PROPERTIES OF SOIL AND ROOT GROWTH OF ORNAMENTAL BULBS
Combined field and pot experiments were used to study the influence of soil compaction on the development of the root system of bulbs. Compaction was applied under field conditions with a Caterpillar D4. To avoid complications due to insufficient drainage, a pumped tile drainage system was installed during the second year of the study. A number of the physical properties of soil proved to be considerably influenced by compaction, e.g. hydraulic conductivity, water storage, pore-space values, and mechanical resistance. Root-growth impedance seems to be a matter of mechanical resistance. At pore-volume values of less than between 43 and 42%, root growth did not occur. Within the same range, a strong increase of penetration resistance was observed.
de Haan, F.A.M. and van der Valk, G.G.M. (1971). EFFECT OF COMPACTION ON PHYSICAL PROPERTIES OF SOIL AND ROOT GROWTH OF ORNAMENTAL BULBS. Acta Hortic. 23, 326-332