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Articles 39601 - 39630 of 39752
Full-Text Articles in Physical Sciences and Mathematics
Two Newly Discovered Conifers, George F. Beck
Two Newly Discovered Conifers, George F. Beck
All Faculty Scholarship for the College of the Sciences
Two genera of coniferous wood, apparently not listed among the Tertiary woods of the western states, have been recognized in the Percy Train collections from Rainbow Ridge, northwestern Nevada. These two, Tsuga (hemlock) and Chamaecyparis (cedar) bring up to 14 the genera of coniferous wood more or less certainly identified from the period and area in question.
Status Of Tertiary Woods Of The Western States Representing The Juglandaceae, George F. Beck
Status Of Tertiary Woods Of The Western States Representing The Juglandaceae, George F. Beck
All Faculty Scholarship for the College of the Sciences
For many years there has been uncertainty concerning the generic status of some fossil leaves belonging without question to the walnut family as a whole. A review of the woods of Juglandaceae as they have appeared in Tertiary horizons of the western states has suggested which genera are present, and in what proportions their leaves (or other remains) might be expected to appear.
Volume Tables For Connecticut Hardwoods, Walter H. Meyer, Raymond Kienholz
Volume Tables For Connecticut Hardwoods, Walter H. Meyer, Raymond Kienholz
Yale School of the Environment Bulletin Series
No abstract provided.
Nitrate Production As Affected By Grain-Crop Residues On The Surface Of The Soil, T. M. Mccalla, J. C. Russel
Nitrate Production As Affected By Grain-Crop Residues On The Surface Of The Soil, T. M. Mccalla, J. C. Russel
Nebraska Agricultural Experiment Station: Historical Research Bulletins
The purpose of this bulletin is to present the data on nitrate contents and nitrate production in tests where straw or stalk residues were left on the surface through subsurface tillage, as compared with check treatments where these residues were plowed under or were absent. Nine of these tests were at Lincoln, Nebraska, and one was at the Hastings, Nebraska, Hydrological Project. Two tests were conducted in 1939, four in 1941, and four in 1942.
Preliminary Report On Subtratum Temperature Studies On Root Growth, Stanley W. Oexemann
Preliminary Report On Subtratum Temperature Studies On Root Growth, Stanley W. Oexemann
Journal of the Minnesota Academy of Science
No abstract provided.
White Pine Blister Rust In Western North America, J. L. Mielke
White Pine Blister Rust In Western North America, J. L. Mielke
Yale School of the Environment Bulletin Series
No abstract provided.
Establishment, Development, And Management Of Conifer Plantations In The Eli Whitney Forest, New Haven, Connecticut, Ralph C. Hawley, Harold J. Lutz
Establishment, Development, And Management Of Conifer Plantations In The Eli Whitney Forest, New Haven, Connecticut, Ralph C. Hawley, Harold J. Lutz
Yale School of the Environment Bulletin Series
No abstract provided.
Vegetation Of The Northern Part Of Cherry County, Nebraska, William L. Tolstead
Vegetation Of The Northern Part Of Cherry County, Nebraska, William L. Tolstead
Conservation and Survey Division
Agricultural practices in the Great Plains of North America are now in a period of adjustment from a traditional agriculture initiated by pioneer farmers to a grazing economy based upon potentialities of climate and soil. The attainment of a proper system of land use has been retarded in many localities by the lack of definite information concerning the vegetation and its indicator significance. In this study of the vegetation of Cherry County, Nebraska, the interrelations between the plants and their environments are discussed, the dominant species are described, and changes in grasslands caused by seasons, grazing, and climatic cycles are …
Range Sheep Industry In Kittitas County, Washington, Reginald M. Shaw
Range Sheep Industry In Kittitas County, Washington, Reginald M. Shaw
Geography Faculty Scholarship
This article summarizes the sheep industry in Kittitas County, Washington State as a microcosm of the entire Pacific Northwest sheep industry.
Decay Of Western Hemlock In Western Oregon And Washington, G. H. Englerth
Decay Of Western Hemlock In Western Oregon And Washington, G. H. Englerth
Yale School of the Environment Bulletin Series
No abstract provided.
Yield Of Even-Aged Stands Of Loblolly Pine In Northern Louisiana, Walter H. Meyer
Yield Of Even-Aged Stands Of Loblolly Pine In Northern Louisiana, Walter H. Meyer
Yale School of the Environment Bulletin Series
No abstract provided.
Growing Of White Pine On The Yale Forest Near Keene, New Hampshire, Ralph C. Hawley, Robert T. Clapp
Growing Of White Pine On The Yale Forest Near Keene, New Hampshire, Ralph C. Hawley, Robert T. Clapp
Yale School of the Environment Bulletin Series
No abstract provided.
Management Of Loblolly Pine In The Pine-Hardwood Region In Arkansas And In Louisiana West Of The Mississippi River, Herman H. Chapman
Management Of Loblolly Pine In The Pine-Hardwood Region In Arkansas And In Louisiana West Of The Mississippi River, Herman H. Chapman
Yale School of the Environment Bulletin Series
No abstract provided.
The Geographic Distribution Of Azotobacter And Rhizobium Meliloti In Nebraska Soils In Relation To Certain Environmental Factors, H. B. Peterson, T. H. Goodding
The Geographic Distribution Of Azotobacter And Rhizobium Meliloti In Nebraska Soils In Relation To Certain Environmental Factors, H. B. Peterson, T. H. Goodding
Nebraska Agricultural Experiment Station: Historical Research Bulletins
In this investigation a survey of Nebraska soils has been made in order to determine the distribution of the aerobic nonsymbiotic and symbiotic nitrogen fixers of the genera Azotobacter and Rhizobium respectively. In connection with this survey, some of the characteristics of the soils which may bring about this distribution were studied. Up to this time practically no research has been reported on the microflora of the soils of Nebraska. Hence there is little basis for predicting the activity of these organisms under environmental conditions as they exist here. It is hoped that this work will not only supply some …
The Pipy Concretions Of The Arikaree, C. Bertrand Schultz
The Pipy Concretions Of The Arikaree, C. Bertrand Schultz
Bulletin of the University of Nebraska State Museum
The pipy concretions of the Arikaree (lower Miocene) of Nebraska and adjacent states were first described by Nelson Horatio Darton (1899, p. 743) as "characteristic layers of hard, fine-grained, dark-gray concretions, often consisting of aggregations of long, irregular, cylindrical masses" (see Figures 30, 32, 34, and 35). The individual pipes vary in diameter from a few inches to several feet, and in length from a few inches to a hundred yards or more. Tests demonstrate that pipy concretions are composed of sand cemented by calcium carbonate. When dipped in acid the cement is dissolved and the concretion is reduced to …
The Ancestral Ursid, Hemicyon, In Nebraska, Edwin H. Colbert
The Ancestral Ursid, Hemicyon, In Nebraska, Edwin H. Colbert
Bulletin of the University of Nebraska State Museum
During the summer of 1928, a University of Nebraska State Museum field party, composed of Dr. A. L. Lugn and the writer, made a collection of upper Miocene and lower Pliocene mammals in Brown and Cherry counties, Nebraska. This collection was sponsored and made possible by the generosity of the late Hon. Charles H. Morrill.