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Abstract
Root growth of pine (Pinus mugo var. mughus (Scop.) Zen.) was studied at a rhizotron (underground root observation laboratory) on an in situ basis. Greater root elongation occurred in peat than in mineral soil and when there were sustained periods of temperature extremes, root growth increased or decreased 2 to 5 days following increases or decreases in soil temperature.
Roots of poplar (Populus alba var. pyramidalis Bunge), grown in glass-sided boxes under controlled growth conditions, suberized more quickly when exposed to natural and artificial light than when kept in the dark.
Abstract
In situ root growth of young plum trees (myrobalan rootstock on which ‘Shiro’ plum was budded) was studied for one season at the University of Guelph rhizotron. Root growth of this combination, at the field-transplant stage, began before leaf growth and extended past leaf fall. Relatively large roots of myrobalan stock made some winter growth in length, below frost penetration. The rate of growth during July to mid-September was twice that of the balance of the season, corresponding closely to shoot and trunk increments. Root diameter and elongation rate are positively correlated. Irregular and patchy suberization was the rule with the young plum roots.