Chemical and mechanical methods of reducing herbaceous competition within tree plantings on three Iowa soil types were studied. Treatments included Garlon, Esteron-Dowpon, Simazin, Chloro IPC, Mylone, Vapam, disking, mowing, cultivation, and check. Survival and height growth of jack pine, white pine, cottonwood, and black walnut were determined for each method of control. Available light and soil moisture were also determined within each treatment as supplementary measures of the success of competition control. Tree seedling survival and height growth varied somewhat among treatments from soil type to soil type. However, survival and height growth were generally greatest on the cultivated plots followed in order by (1) Garlon and Esteron-Dowpon; (2) Simazin, Chloro IPC, and mowing; and (3) disking, Vapam, and Mylone. Thirty- to fifty-day differences in the length of effectiveness of the chemicals and major changes in weed composition during reinvasion affected responses noticeably. In general, tree survival and height growth varied directly with the effectiveness of weed control as reflected in available soil moisture and light intensities.
Proceedings of the Iowa Academy of Science
©1961 Iowa Academy of Science, Inc.
Pruett, Emerson W. and Gatherum, Gordon E.
"Control of Herbaceous Vegetation in Forest Plantings,"
Proceedings of the Iowa Academy of Science, 68(1), 153-161.
Available at: https://scholarworks.uni.edu/pias/vol68/iss1/25