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Articles 39001 - 39030 of 39772
Full-Text Articles in Physical Sciences and Mathematics
Methodological And Validation Study Of Seed Reserves In Desert Soils, David W. Goodall, Stuart Childs, Herman Wiebe
Methodological And Validation Study Of Seed Reserves In Desert Soils, David W. Goodall, Stuart Childs, Herman Wiebe
Memorandum
The development of a method for separating seeds from desert soils, and enumerating them, is described.
In the Great Basin desert, species differed greatly in their depth distribution, some having a peak at or just below the surface, while others were still abundant below 5 cm. Much higher seed densities were found beneath the canopies of shrubs and of tussock grasses than in the inter-spaces; no consistent differences were found, however, associated with the species of the canopy plant, or with distance from its center.
Tentative estimates are given of the seed population in the four validation sites in Curlew …
Diurnal Studies At A Station On An Urban Estuary In Norfolk, Virginia, Burton Marc Golue
Diurnal Studies At A Station On An Urban Estuary In Norfolk, Virginia, Burton Marc Golue
Biological Sciences Theses & Dissertations
No abstract.
The Prairie Naturalist Vol. 4, No.1. March, 1972
The Prairie Naturalist Vol. 4, No.1. March, 1972
The Prairie Naturalist
EDITORIAL: Advertising by Power Suppliers ▪ William A. Buresh
FIRST FLOWERS OF TREES, SHRUBS AND VINES IN THE FARGO, NORTH DAKOTA AREA ▪ O. A. Stevens
CHRISTMAS BIRD COUNTS FOR NORTH DAKOTA—1971 ▪ Robert N. Randall
ENVIRONMENTAL LEGISLATION IN NORTH DAKOTA—EXPECTATIONS AND REALITIES ▪ Paul B. Kannowski
SEASONAL NOTES ON PLANKTON ALGAE OF EAST STUMP LAKE, NORTH DAKOTA ▪ Dean W. Blinn
A SKUNK WITH A GLASS COLLAR ▪ Peter W. Rakowski
SPRING MIGRATION OF BIRDS IN NORTH DAKOTA IN 1971 ▪ Paul F. Springer, Douglas H. Johnson and John T. Lokemoen
NOTE
Red throated loon observed on Lake Ashtabula, …
A Perspective On Economic Impact, L. Douglas James, Donald M. Soule, William O. Thompson, John L. Fulmer, John C. Redman, Robert C. Tussey, John M. Higgins, Claude M. Vaughan, David H. Rosenbaum, Billy R. Prebble, Charles O. Dowell, John E. Sirles, Michael B. Hargrove, Clyde T. Bates, Kenneth G. Holbrook, Dennis H. Bianchi, John P. Breaden, Kenneth R. Harman
A Perspective On Economic Impact, L. Douglas James, Donald M. Soule, William O. Thompson, John L. Fulmer, John C. Redman, Robert C. Tussey, John M. Higgins, Claude M. Vaughan, David H. Rosenbaum, Billy R. Prebble, Charles O. Dowell, John E. Sirles, Michael B. Hargrove, Clyde T. Bates, Kenneth G. Holbrook, Dennis H. Bianchi, John P. Breaden, Kenneth R. Harman
KWRRI Research Reports
The institutions responsible for water resources management in the United States have originated as political responses to major social issues. Each agency institutionalized a procedure for structuring and comparing alternatives in the formulation of its total program. Each agency originally sought to promote effective resolution of its social issue (flood control, development of arid lands, soil erosion, etc.), but more recent efforts have sought better coordination among agency practices through a common procedure largely derived from economic theory. Any procedure, however, varies in application with the interpretation and judgment of individual planners. Today, public pressures have brought political directives requiring …
The Ias Bulletin, V6n2, March 1972, Iowa Academy Of Science
The Ias Bulletin, V6n2, March 1972, Iowa Academy Of Science
IAS Bulletin
In this issue:
--- Officers, Directors, and Section Chairmen, 1971-72
--- 84th Session Program Complete
--- Proceedings Will Not Be Forwarded
--- Third Issue of Quarterly Proceedings Ready in April
--- Note from an "Oldtimer"
--- AAAS Research Grant Funds Available
--- To Count Our Blessings
--- AAAS Board Adopts New Statement of Goals
--- Status of AAAS Governance Changes
--- Registration Form
--- Invitation from the Midwest Benthological Society
--- ISU Announces Sigma XI and Bessey Lectures
--- Call for Papers
--- Membership Facts
On The Mechanism Of Low-Temperature Termolecular Atomic Recombination, Russell T. Pack, Richard L. Snow, Wesley D. Smith
On The Mechanism Of Low-Temperature Termolecular Atomic Recombination, Russell T. Pack, Richard L. Snow, Wesley D. Smith
Faculty Publications
A simple theory of gas-phase termolecular atomic recombination kinetics is presented which treats the bound-complex (BC) mechanism in a fashion which parallels the Roberts, Bernstein, and Curtiss resonance theory of the energy-transfer (ET) mechanism. The ET rate constant has a low temperature maximum, but the BC rate constant does not. The contributions of the two mechanisms to the low-temperature recombination of hydrogen atoms, with He, Ar, and H2 as third bodies, are estimated and compared. The presence (absence) of a low-temperature maximum in the observable total rate constant is determined by absence (presence) of bound vibrational levels of the hydrogen-third …
Soil And Plant Analysis For Mineral Deficiencies, M D. Carroll
Soil And Plant Analysis For Mineral Deficiencies, M D. Carroll
Journal of the Department of Agriculture, Western Australia, Series 4
Soil and plant analysis (testing) has its supporters and its critics. Some of the differences are resolved if the distinction is made between the concept and the practice. Most people would agree with the concept of soil and plant analysis but the practice, or service offered, in any agricultural situation can be subject to valid criticism.
This article defines some of the principles involved and illustrates some of the problems, to provide a better understanding of the usefulness and the limitations of soil and plant analysis as a diagnostic aid in plant and animal nutrition.
Long Term Rotation Trials, I C. Rowland
Long Term Rotation Trials, I C. Rowland
Experimental Summaries - Plant Research
LONG TERM ROTATION TRIALS The results shown are the yield of grain harvested from crops grown under various rotations of pasture ley. W56H, 66M29, 67N4, 67BA6, 68E5, 68SG5, 69GE20
The Alfred C. Glassell, Jr.—University Of Miami Argosy Expedition To Ecuador, Donald P. De Sylva
The Alfred C. Glassell, Jr.—University Of Miami Argosy Expedition To Ecuador, Donald P. De Sylva
Studies in Tropical Oceanography
No abstract provided.
Frost Injury To Cereals In W.A, M W. Perry, A. G. P. Brown
Frost Injury To Cereals In W.A, M W. Perry, A. G. P. Brown
Journal of the Department of Agriculture, Western Australia, Series 4
Late spring frosts commonly reduce yields and affect the quality of grain in wheat crops, especially in the southern, eastern and north-eastern districts. The damage is usually localised on individual farms, but is sometimes widespread.
Barley, and oats to a lesser extent, are also affected. Average losses of wheat in Western Australia have been estimated at 3 to 5 per cent, per year, or about 2 million bushels on current production figures.
A Simulation Model For The Management Of Sandhill Cranes, Richard S. Miller, George S. Hochbaum, Daniel B. Botkin
A Simulation Model For The Management Of Sandhill Cranes, Richard S. Miller, George S. Hochbaum, Daniel B. Botkin
Yale School of the Environment Bulletin Series
No abstract provided.
Metric Conversion For Agriculture, Department Of Agriculture, Western Australia
Metric Conversion For Agriculture, Department Of Agriculture, Western Australia
Journal of the Department of Agriculture, Western Australia, Series 4
Farmers are already becoming involved with metric units and by 1974 conversion of the farming industry will be well advanced. Wool sales converted to metric measurements in August, 1971, and sales by the various grain marketing boards will be largely in metric terms in the 1972 harvest. Weather information to the public has been given in metric terms since September 1.
Degradation Of Riparian Leaves And The Recycling Of Nutrients In A Stream Ecosystem, Louis A. Krumholz, Roger G. Lambert, Charles R. Liston, Harry H. Woodward
Degradation Of Riparian Leaves And The Recycling Of Nutrients In A Stream Ecosystem, Louis A. Krumholz, Roger G. Lambert, Charles R. Liston, Harry H. Woodward
KWRRI Research Reports
Leaves collected at 4 stations in the upper 5 km of Doe Run, Meade County, Kentucky, indicated an annual accumulation within the stream of 354 g/m2/year (17,700 kg). Leaves of sycamore (23.6%), red oak (21.7%), sugar maple (9.7%), beech (9.6%), white oak (7.1%), and hickory (6.0%) trees were most abundant, and leaves from 14 other kinds made up the remaining 22.3%. About a third of the annual leaf fall occurred during the last half of October and about two-thirds in the last 3 months of the year.
Calorific equivalents for different kinds of leaves ranged from 3,789 cal/g …
Factors Regulating The Growth Of Algae In Continuous Culture In Diluted Secondary Sewage Treatment Plant Effluent And Subsequent Biodegradability, Edward G. Foree, Caroline P. Wade
Factors Regulating The Growth Of Algae In Continuous Culture In Diluted Secondary Sewage Treatment Plant Effluent And Subsequent Biodegradability, Edward G. Foree, Caroline P. Wade
KWRRI Research Reports
Heterogeneous algal cultures were grown in laboratory continuous culture in continuous flow, completely mixed chemostats in secondary sewage treatment plant effluent diluted to give an ammonia nitrogen concentration of 10 mg/1. Variables were lighting, pH, carbon dioxide availability, and hydraulic residence time.
Optimum growth occurred under pH 7.0, excess CO2, and continuous lighting conditions. The availability of artificially supplied excess CO2 greatly increased the mass (standing crop) at steady-state over that produced under otherwise identical conditions for all residence times studied. For the case of excess CO2 availability, the nitrogen concentration in the algal cells regulated …
Bahamas Bibliography : A List Of Citations For Scientific, Engineering And Historical Articles Pertaining To The Bahama Islands, Carol Fang, W. Harrison
Bahamas Bibliography : A List Of Citations For Scientific, Engineering And Historical Articles Pertaining To The Bahama Islands, Carol Fang, W. Harrison
Reports
Specialized bibliographies are sometimes needed in connection with the research studies being pursued at the Virginia Institute of Marine Science. The Bahamas Bibliography arose out of the needs of marine geologists, biologists and physical oceanographers engaged in studies of beaches, fishes and inlet currents in the Bahama Islands. Although the present bibliography may suffer from completeness, it significantly surpasses in number of citations the only other known bibliography of like kind.
Limnology Of Four Bauxite Open-Pit Lakes, George L. Harp, Ronald D. Hubbard
Limnology Of Four Bauxite Open-Pit Lakes, George L. Harp, Ronald D. Hubbard
Journal of the Arkansas Academy of Science
The aquatic flora and fauna and 18 physicochemical characteristics of four bauxite open-pit lakes were studied from September 1969 to August 1970. The least acid lake (pH 3.4-4.4) supported 49 different aquatic insects, plankton, and higher aquatic plants. The most acid lake (pH 2.7-3.2) supported only 26 different plants and animals. Bauxite open-pit lakes within the pH range studied appear to be as relatively unproductive as their coal strip-mine lake counterparts, with which they share physicochemical and biological characteristics. Benthic macrofaunal diversity and abundance appear to be related more closely to distribution and abundance of leaf detritus than to hydrogen-ion …
Kojonup Maintenance Phosphorus And Sulphur Trial 68br7ex, J W. Bowden, B. Scurr
Kojonup Maintenance Phosphorus And Sulphur Trial 68br7ex, J W. Bowden, B. Scurr
Experimental Summaries - Plant Research
68BR7 Maintenance superphosphate and sulphur trial To determine the level of superphosphate to maintain near maximum plant and animal production with and without additional elemental sulphur. Experimental: There are 41 plots with 29 treatments. 12 treatments have 2 replications. Site: Very old land, whitegum and sheoak vegetation with greybrown sandy loam and some quartz grit. History: Superphosphate - 1/2bag for 40 years - 3,600 lbs (1633 kg). 600 lb (272 kg) in the last 4 years to 1967.
Standing Crop And Productivity Of Marsh Vegetation At Saratoga Springs, California, W. G. Bradley
Standing Crop And Productivity Of Marsh Vegetation At Saratoga Springs, California, W. G. Bradley
Memorandum
No abstract provided.
Statistical Analysis Of Desert Rock Distributions, Eugene Richard Heyman
Statistical Analysis Of Desert Rock Distributions, Eugene Richard Heyman
Memorandum
No abstract provided.
Data Summary For Aquatic Macroinvertebrates, L. G. Richardson, M. D. Merritt, C. R. Ward
Data Summary For Aquatic Macroinvertebrates, L. G. Richardson, M. D. Merritt, C. R. Ward
Memorandum
No abstract provided.
Food Habits Of Northern Rodents And Jackrabbits, W. E. Saul
Food Habits Of Northern Rodents And Jackrabbits, W. E. Saul
Memorandum
No abstract provided.
Application Of Remote Sensing Techniques For Analysis Of Desert Biome Validation Studies, Paul T. Tueller, Garwin Lorain
Application Of Remote Sensing Techniques For Analysis Of Desert Biome Validation Studies, Paul T. Tueller, Garwin Lorain
Memorandum
No abstract provided.
Curlew Valley Validation Site Report, David F. Balph
Aquatic Macroinvertebrates Of The Playa, G. Richardson, C. R. Ward, E. W. Huddleston
Aquatic Macroinvertebrates Of The Playa, G. Richardson, C. R. Ward, E. W. Huddleston
Memorandum
No abstract provided.
Seasonal Use Of Soil Moisture By Mature Velvet Mesquite, Dwight R. Cable
Seasonal Use Of Soil Moisture By Mature Velvet Mesquite, Dwight R. Cable
Memorandum
No abstract provided.
Diets, Food Preferences, And Reproductive Cycles Of Some Desert Rodents, R. P. Balda, G. C. Bateman, T. A. Vaughan
Diets, Food Preferences, And Reproductive Cycles Of Some Desert Rodents, R. P. Balda, G. C. Bateman, T. A. Vaughan
Memorandum
No abstract provided.
Effects Of Environmental Factors On Rates Of Primary Production Of Two Desert Grass Species, Gary L. Cunningham, Fred R. Balding
Effects Of Environmental Factors On Rates Of Primary Production Of Two Desert Grass Species, Gary L. Cunningham, Fred R. Balding
Memorandum
No abstract provided.