Follow these links to Michigan State University's articles on Root Pruning.
"Root pruning guide for apple trees to reduce excessive vigor"
"A renewed interest in root pruning"
Also a study from 2011
"Root pruning apple trees to control excessive vigor in 2011"
"NEW" Disc type root pruner. Single Sided (above) or Double Sided.
30" Tall discs slice easily into heavy soil.
Thin, rolling discs require much less power to pull through heavy soil.
The double-sided has a collapsed width of 84 inches and 36 inches of adjustment on each side.
Features:
• Heavy duty construction.
• Adjustable to row width.
• Adjustable skid plate.
• Tool stand for safe and easy hook-up.
Optional:
• 36" Slide cylinder with hoses and fittings for single or double-row models.
Advantages:
• Slows growth of over vigorous trees.
• Increased firmness and storage life of fruit.
• Gives better color to red varieties.
• Greatly decreases dropping of fruit at harvest.
