Abstract After four years black walnut trees given complete crown release were growing twice as fast as trees not released. Dominant and codominant trees with large crowns responded best to release but strong intermediates also responded. Some pole-sized trees had bole sprouts whether released or not; however, sprouting was practically nil on small sawtimber-sized trees. Potential walnut-crop trees should be released often enough to provide for crown expansion.
F. Bryan Clark (Thu,) studied this question.