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- Culverts too small in diameter or poorly placed were major causes of timber flooding and tree damage. Placement problems were poor culvert slope, poor hydraulic approach, lack of gravel bedding, and too little soil covering the culverts.AuthorsJ.H. StoeckelerKeywordsSourceResearch Note NC-37. St. Paul, MN: U.S. Dept. of Agriculture, Forest Service, North Central Forest Experiment StationYear1967
- In a plantation of four hardwood species on a silt loam soil planted to 1-0 stock, 4 pounds of active atrazine or simazine controlled weeds effectively without injuring the trees. Chemical weed control was better on plowed and disked ground than on unprepared ground. Yellow-poplar and white ash grew faster on prepared ground. Black walnut and red oak did not respond to ground preparation treatments. Guides are presented for proper use of the chemicals in establishing hardwood plantations.AuthorsGayne G. ErdmannKeywordsSourceResearch Note NC-34. St. Paul, MN: U.S. Dept. of Agriculture, Forest Service, North Central Forest Experiment StationYear1967
- Springflow and ground water levels both rose with winter thaws, even when the ground was frozen. A high soil water content suggests that water moved to the water table through a continuous column of soil water rather than as a wetting frontAuthorsRichard S. SartzKeywordsSourceResearch Note NC-35. St. Paul, MN: U.S. Dept. of Agriculture, Forest Service, North Central Forest Experiment StationYear1967
- Gives the average rates of perimeter increase for fires in four broad fuel type groups by four spread index classes.AuthorsNonan V. NosteKeywordsSourceResearch Note NC-40. St. Paul, MN: U.S. Dept. of Agriculture, Forest Service, North Central Forest Experiment StationYear1967
- Presents 1966 forest type areas by counties and shows trends in forest type areas since 1955, by survey units.AuthorsArnold J. OstromKeywordsSourceResearch Note NC-41. St. Paul, MN: U.S. Dept. of Agriculture, Forest Service, North Central Forest Experiment StationYear1967
- Although data on use for 1961 and 1966 are not always comparable, a bare-minimum estimate of the increase in number of visitors between those years in 19 percent. The greatest increase was in number of canoeists and boaters, which rose on the average 9 or 10 percent a year.AuthorsRobert C. LucasSourceResearch Note NC-42. St. Paul, MN: U.S. Dept. of Agriculture, Forest Service, North Central Forest Experiment StationYear1967
- Sawtimber and poletimber acreage was half again as large in 1966 as in 1955; seedling and sapling acreage had decreased about one-third; and nonstocked area had dropped from 1.2 million acres to 100,000.AuthorsRobert N. StoneKeywordsSourceResearch Note NC-39. St. Paul, MN: U.S. Dept. of Agriculture, Forest Service, North Central Forest Experiment StationYear1967
- Prescribed burning to prepare a seed-bed, seedling native grasses or fescue on proper sites, and fertilizing are all necessary for successfully establishing good grass production where trees have been killed by aerially applied berbicides.AuthorsH.S. Crawford, A.J. BjugstadKeywordsSourceResearch Note NC-22. St. Paul, MN: U.S. Dept. of Agriculture, Forest Service, North Central Forest Experiment StationYear1967
- Most of the intensive grazing on forested land in the Missouri Ozarks is occuring on land with a low potential for growing commercial timber.AuthorsA.J. Bjugstad, H.S. CrawfordSourceResearch Note NC-23. St. Paul, MN: U.S. Dept. of Agriculture, Forest Service, North Central Forest Experiment StationYear1967
- Presents stand volume equations and a stand volume table for shortleaf pine in Missouri and describes their development and application.AuthorsKenneth A. BrinkmanKeywordsSourceResearch Note NC-24. St. Paul, MN: U.S. Dept. of Agriculture, Forest Service, North Central Forest Experiment StationYear1967