Document Type



Box elder trees in replicated plots within four seasonal blocks mostly ranged in age from 17 to 24 years, in breast-high diameter from 2 to 8 inches, and in height from 18 to 24 feet. Tree cutting at 3 inches and at 1 foot was done with a chain saw; and a brush killer-fuel oil mixture, at the rate of one quart of concentrate to 5 gallons of fuel oil and one quart to 10 gallons, was applied to the stumps. Resprouting from stumps cut at both heights and in four different seasons was controlled by both concentrations of the mixture to the extent of 99.8 per cent. Untreated stumps sprouted almost 100 per cent. Basal treatment of standing trees bordering the cleared blocks gave 100 per cent kill with the 1 to 5 mixture, but only imperfect kill with the 1 to 10 mixture. Weed growth was greater in the two blocks cleared before growth started in the spring than in the two blocks cleared in July and October. Yield of bluegrass in October, 1958, was about 60 per cent greater in the first two clearings than in the last two and in the adjacent uncleared check. This early sampling seemed to test the effect of time elapsed since clearing, rather than season of clearing. Low-cut, treated stumps with tree removal gave excellent sprout control, and as a method was superior to (1) high cut stumps, (2) no tree removal, and (3) basal treatment of standing trees in the control of weeds, improvement of bluegrass growth, and utilization, sanitation, and general husbandry.

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Proceedings of the Iowa Academy of Science





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©1959 Iowa Academy of Science, Inc.



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