. Canadian forestry journal. Forests and forestry -- Canada Periodicals. Canadian Foresir}) Journal, September, 1919 353. HOW TREES OFTEN TAKE A HOLIDAY IN EARLY SUMMER AND LATER RESUME THEIR JOB OF GROWING. The terminal twig grew 27 days, then rested for 23 days, and again resumed gro\vtli for about 25 days. The iminature leaves indicate tlie portion of the twig wliicli was developed during the second period of growth. tinctive inherent growth characteristics. Some place their growth without a break, while others place it by leaps and bounds alternating with rest periods. In this respect the
. Canadian forestry journal. Forests and forestry -- Canada Periodicals. Canadian Foresir}) Journal, September, 1919 353. HOW TREES OFTEN TAKE A HOLIDAY IN EARLY SUMMER AND LATER RESUME THEIR JOB OF GROWING. The terminal twig grew 27 days, then rested for 23 days, and again resumed gro\vtli for about 25 days. The iminature leaves indicate tlie portion of the twig wliicli was developed during the second period of growth. tinctive inherent growth characteristics. Some place their growth without a break, while others place it by leaps and bounds alternating with rest periods. In this respect the method of working followed by trees, and growth surely is work, differs little from the methods of other organisms, including man. Rarely does any organism work continuously, but rest periods are usually, and sometimes frequently, inter- spersed between the periods of work. Few comprehensive statements can be made regarding the growth behavior of forest trees during the growing season. Yet, in spite of wide divergence the fundamental features of the growth procedure throughout the growing season may be summarized as follows: Growth begins slowly, after a variable period rises rapidly, then reaches a maximum which is maintained for a short while, finally falls gradu- ally to a minimum, and then ceases completely. The period during spring and summer when height growth does not progress may be regard- ed as a resting period, or a period of prepara- tion. The trees apparently rest, but in reality they are preparing for the next upward thrust which may be longer than the original advance Furthermore, the writer believes that the re- curring rest periods may become a rather fixed and regular feature of the growth of certain species. This is certainly true in the case of normal young Pitch Pine in the vicinity of Mont Alto, which exhibits annually a cesâ sation of growth for a qeriod of 2 to 3 weeks. Greater Growth by Night. The rate of tree growth not only fluctuates throughout the
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