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`Melrose'/M.26 apple  (Malus domestics  Borkh.) trees were mechanically root-pruned annually for 9 years at bloom to a 25-cm depth at 80 cm from the trunk on two sides. An evaluation of the number of roots of four size categories on the exposed wall of a 1.2  x  2-m trench located 1 m from the trunk indicated that root pruning caused a reduction in all root size categories. Roots &lt; 1 mm in diameter were reduced 20% by root pruning, while the reduction in larger roots was nearly double this amount. The effect of root pruning on root distribution was greatest in the top 30 cm of soil, parallel to the location of the root-pruning cut. Roots below 30 cm were unaffected. The number of roots in all size categories in samples taken parallel and perpendicular to the row decreased linearly with soil depth.

Root Distribution following 9 Years of Root-pruning `Me1rose'/M.26 Apple Trees