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Articles 38401 - 38430 of 39777
Full-Text Articles in Physical Sciences and Mathematics
Take-All Of Cereals And Cereal Seed Dressings, G D. Macnish
Take-All Of Cereals And Cereal Seed Dressings, G D. Macnish
Experimental Summaries - Plant Research
Take-all of cereals. Take-all surveys. Effect of nitrogen sources on take-all: 76LG25 Wheat, 77MT19 Wheat, 77JE31 Barley, 77MT17 Barley, 77LG20 Oats, 77JE5 Wheat, 77LG6 Wheat, 77E4 Wheat, 77ES6 Wheat, 77GE10 Wheat. Effect of rates of (NH4)2 SO4 and Na NO3 on take-all - 77E6 Wheat, 77ES Wheat. Effect of rates of (NH4)2 SO4 on take-all - 77LG7 Wheat, 77JE6 Wheat. Soil pH and take-all - 77LG25 Cleaning crops and take-all control - 76E6, 76N5, 76M47, 76A7, 76LG27. Spray-fallow and time of planting - 76GE35 9 76LG26, 76LG26, 76LG38. Effect of rates of sowing on take-all - 77JE7. Long term rotations …
Nitrogenous Fertilisers For Cereals - Results From 1977 Trials On Wheat, Oats And Barley, M. G. Mason
Nitrogenous Fertilisers For Cereals - Results From 1977 Trials On Wheat, Oats And Barley, M. G. Mason
Experimental Summaries - Plant Research
Rates of Nitrogen on Wheat, Oats and Barley - Soil Test. In this, the third year of this programme, 44 sites were selected and soil sampled during February - March. Thirty seven of these trials consisted of four replications on wheat only and the other seven consisted of three replications on wheat, oats and barley. All reps were soil sampled separately. In each rep. of the 37 trials, 20 samples were taken to 10 cm depth with pogo stick samplers. In the. other seven trials 50 samples per rep. were taken. In addition, from three holes at random across each …
Minimum Tillage Trials 1977, G. A. Pearce
Minimum Tillage Trials 1977, G. A. Pearce
Experimental Summaries - Plant Research
Minimum tillage trials 1977. Locations: Wongan Hills R.S., Avondale, Merredin, Mt. Barker, Esperance. Sites: At each station two sites were used, the first was under crop in 1976 and the trial will be repeated each year on the same area. The second site was under pasture in 1976 and was due to be cropped in 1977 as part of the normal district practice. The trials will be planted on a similar pasture site in 1978. Results. Apart from crop yields, weed counts (before spraying) and crop plant numbers were taken. Other measurements were made by various research officers and reported …
Miscellaneous Crop Trials - High Rainfall Districts, M. W. Perry
Miscellaneous Crop Trials - High Rainfall Districts, M. W. Perry
Experimental Summaries - Plant Research
1. High Rainfall Miscellaneous Crop Trials - 77BU3, 77BU11, 77DE2. 77HA1, 77HA6, 77MA2, 2. Standard Alternative Crop Trials - 77BA16, 77MT20, 77NA27, 77NA28. 3. L. cosentinii Establishment and Regeneration - 77MO20, 77GE31, 77TS22. Plant density x time of planting on L. Consentinii - 77BA15. 4. L. consentinii seeding rates - 77BR11. 5. Seeding Rates for High Rainfall Cereals - 77BR11.
Pasture Species Investigations - High Rainfall Area 1976, D A. Nicholas
Pasture Species Investigations - High Rainfall Area 1976, D A. Nicholas
Experimental Summaries - Plant Research
Contents Clover cultivar grazing trial (N. Bannister) - NOT in this document. Perennial versus annual grass grazing trial (Manjimup Research Station) - 72MNS. Pasture types x stocking rate trial (Denmark Agricultural High School) - 72D1. Clover cultivar evaluation trial (Denmark Research Station) - 8. The final yield sampling in December was not obtained through cattle having broken into the area. Clover cultivar evaluation trial (Karridale) - 77BU10. Clover cultivar evaluation trial (Denmark Research Station) - 77D5, 77DF, Clover cultivar evaluation trial (Wellstead) - 77AL22. Clover cultivar Evaluation Trials. Location: Esperance District - 77ES27 - R.L. Stead, Dalgup; 77ES28 - E.L.D., …
Iowa Academy Of Science Leadership Directory, 1977-78, Iowa Academy Of Science
Iowa Academy Of Science Leadership Directory, 1977-78, Iowa Academy Of Science
Iowa Academy of Science Documents
Table of Contents:
Officers and Directors ... 2
Section Chairpersons ... 3
Standing Committees ... 6
Special Committee ... 15
A Logical Approach To Wheatbelt Water Supply, Stanley Thomas Smith
A Logical Approach To Wheatbelt Water Supply, Stanley Thomas Smith
Journal of the Department of Agriculture, Western Australia, Series 4
My particular task in this seminar (paper) has been to enunciate a logical approach to water recource utilisation in the wheatbelt, based on the points made by the speakers.
Feeding Ecology Of Black Sea Bass Centropristis Striata On An Artificial Reef Off Virginia (Perciforms: Serranidae), Ping K. Chee
Feeding Ecology Of Black Sea Bass Centropristis Striata On An Artificial Reef Off Virginia (Perciforms: Serranidae), Ping K. Chee
OES Theses and Dissertations
The feeding ecology of the black sea bass, Centropristis striata, associated with artificial reefs shows seasonal and size-related changes. Monthly collections totaling 520 black sea bass taken from an artificial reef near the Chesapeake Light Tower, Virginia, between August 1975 and May 1976, were analyzed for food habits as revealed by number, volume, frequency of occurrence and a modified Index of Relative Importance.
The black sea bass feeds on the artificial reef as well as the adjacent areas. When food was abundant on the reef, food items from the reef and the surrounding area were consumed. Upon depletion of the …
Intensive Hydrographical And Water Quality Survey Of The Chincoteague/Sinepuxent/Assawoman Bay Systems : Volume Ii. Data Report: Intensive, Hydrographical And Water Quality, C. S. Fang, A. Rosenbaum, J. P. Jacobon, P. V. Hyer
Intensive Hydrographical And Water Quality Survey Of The Chincoteague/Sinepuxent/Assawoman Bay Systems : Volume Ii. Data Report: Intensive, Hydrographical And Water Quality, C. S. Fang, A. Rosenbaum, J. P. Jacobon, P. V. Hyer
Reports
No abstract provided.
Some Basics Of Marron Production, Department Of Agriculture, Western Australia
Some Basics Of Marron Production, Department Of Agriculture, Western Australia
Journal of the Department of Agriculture, Western Australia, Series 4
marron are native to the South-West of Western Australia, and are keenly sought by inland fisher-men. However, supplies do not equal the apparent demand.
One solution is to cultivate marron in farm dams, or more intensively as a commercial enterprise.
This article suggests a few guidelines for marron production.
Effect Of Soil Properties On Copper Availability To Plants, R. F. Brennan
Effect Of Soil Properties On Copper Availability To Plants, R. F. Brennan
Experimental Summaries - Plant Research
Experimental glasshouse work involved examining the decrease in effectiveness of copper fertilizer in the soil through time. This seems to conflict with Mr. J.W. Gartrell's programme of field trials which have shown no evidence for any decline in the effectiveness of the original application. 1. Ammonium cxalate extractable Cu. TABLE 3 - 77GL3. The response to copper of Gamenya Wheat grown in a range of W.A. soils (Average dry weight (3 reps) - g/10 plants). 77GL4. Dongara, Gingin, Dowerin, Newdegate, S. W. Newdegate, Merredin. TABLE 4 - 77GL4. Effect of PH and incubation on the effectiveness of CuS045H20 to Gamenya. …
Lupin Trials, J Moore
Lupin Trials, J Moore
Experimental Summaries - Plant Research
Trials in lupins this year concentrated on testing herbicide for post emergence use in lupins. Of the 20 herbicides tested 12 did not cause significant decreases in crop density and/or yield. However, weed control was often poor and the herbicide phytotoxicity tended to vary between sites. (Chapman, Badgingarra and Avondale). The Chapman and Avondale trials were not harvested because of drought. Trials in 1978 should determine if any of the herbicides tested can safely be recommended. Lupins - summary. Post emergence lupin herbicides (Badgingarra Research Station) - 77BA36. Post emergence herbicides for lupins (Chapman Research Station) - 77C18. Post emergence …
Oyster Spatfall On Shellstrings In Virginia Rivers: 1976 Annual Summary, Dexter S. Haven, Paul C. Kendall
Oyster Spatfall On Shellstrings In Virginia Rivers: 1976 Annual Summary, Dexter S. Haven, Paul C. Kendall
Reports
The Virginia Institute of M3rine Science (VIMS) conducts weekly surveys from June through early October to obtain oyster spatfall information. Spat counts are made from oyster shells strung on wire and suspended from stakes on public and private beds. The number of spat on shells are counted each week of the spawning season to determine the potential of a particular area for receiving a strike and to predict the most likely period the strikes will occur, Shells planted just before the period of maximum set have the best chance of getting a good strike,
Spruce Budworm In Maine, 1910-1976: Infestations And Control, David Weed
Spruce Budworm In Maine, 1910-1976: Infestations And Control, David Weed
Maine Collection
Spruce Budworm in Maine, 1910-1976: Infestations and Control
compiled by David Weed, Maine Forest Service, Maine Department of Conservation, 1977.
Contents: I. Introduction, II. Infestation Chronology, III. Defoliation 1910-18 to 1976, IV. Spraying History, V. Mothflight Data, VI. Aircraft Employed, VII. Aircraft: Photo Essay
A Stream Survey Of Riley Creek, Coles County, Illinois, Using Macroinvertebrates As Indicators Of Organic Pollution, Joseph R. Rowe
A Stream Survey Of Riley Creek, Coles County, Illinois, Using Macroinvertebrates As Indicators Of Organic Pollution, Joseph R. Rowe
Masters Theses
A stream survey of Riley Creek in Coles County Illinois, was undertaken to determine ecological trends and the qualitative status of the aquatic community throughout the course of the stream.
The survey encompassed the entire length of Riley Creek from the area of its status as an intermittant waterway to its confluence with Cassel Creek. Sampling periods included the months of April, May, June, July, October and November.
Macroinvertebrate collections were made at six locations along the stream approximately equidistant from each other. The organisms were assigned tolerance levels as designated by the Illinois Environmental Protection Agency.
Physical and chemical …
The Partial Purification And Characterization Of A Soluble Activator Of The Cation Transport Adenosinetriphosophatase In Bovine Caudate Nucleus, Paul Culver
University of the Pacific Theses and Dissertations
To many investigators, these observations suggested the existence of a molecular “pump” mechanism responsible for the maintenance of the ionic gradients. Extensive research over the last twenty years has resulted in the assignment of this role to the magnesium-dependent, sodium- and potassium-stimulated adenosine triphosphatase, first reported by Skou in 1957. This membrane-bound enzyme is the subject of the research presented in this thesis.
Lupin Cultivar Comparison, G H. Walton
Lupin Cultivar Comparison, G H. Walton
Experimental Summaries - Plant Research
1. Lupin cultivar comparison - L. cosentinii cv. CB49 and L. angustifo1ius cv Marri - 77A20. - L. albus cv Ultra and L. angustifolius cultivars, BRAMLEY R.S. - 77B1(A), 77B1(B). 2. Field pea cultivar comparison - AVONDALE R.S. - 77A22. 3. Lupin and cereal mixtures - 77MO19, 4. Undersowing of subclover pasture - 77NA25. Plant competition in mixtures of lupin and cereal (Lancelin) - 77MO19. Undersowing lupin and wheat crops with sub. clover (Cuballing) - 77NA25. Polycultures of wheat and lupin (Crossman) - 77NA26, 77MO18. Expt no: 76JE7, 77A20, 77A21, 77A22, 77B1(A), 77B1(B), 77GE30, 77MO17, 77MO18, 77MO19, 77NA25, 77NA26, 77TS21.
Native Plants : Water Savers In The Garden, K S. Cole
Native Plants : Water Savers In The Garden, K S. Cole
Journal of the Department of Agriculture, Western Australia, Series 4
The climate of Western Australia may be one of the best in the world for people but it is a difficult one for many of our imported, and common garden plants. as a consequence, some 70 per cent of our summer water usage is for gardens and lawns.
This is not the sort of statistic that we should accept easily or happily.
There is a solution to this problem: a new approach to home gardening is required.
The new garden is based on W. A.'s own colourful native plants, which are adapted to mild winters, hot dey summers and poor …
Nitrogen Fixation In Virginia Salt Marshes And The Effects Of Chronic Oil Pollution On Nitrogen Fixation In The Mobjack Bay Marshes, Alyce Diane Thomson
Nitrogen Fixation In Virginia Salt Marshes And The Effects Of Chronic Oil Pollution On Nitrogen Fixation In The Mobjack Bay Marshes, Alyce Diane Thomson
Dissertations, Theses, and Masters Projects
N2 fixation rates for several Virginia salt marshes were determined using in situ acetylene-reduction assays. A control and a chronically polluted oil marsh of the mesohaline Mobjack Bay area were sampled over a 1975-76 annual cycle. N2 fixation occurred in all transects which extended from upper mudflat to the Spartina patens zone. An isolated blue-green algal mat exhibited some of the highest N2 fixation rates. Intertidal sediment N2 fixation was patchy, both spatially and seasonally. However average rates (91.45 μg N/m2/h) compared to the estimated N requirement of the graminoid vegetation indicated a significant contribution to the N budget. Vegetation …
The Nesting Ecology Of Several Species Of Herons And The Glossy Ibis (Plegadis Falcinellus) In Three Heronries In Virginia, Barbara Susan Warren
The Nesting Ecology Of Several Species Of Herons And The Glossy Ibis (Plegadis Falcinellus) In Three Heronries In Virginia, Barbara Susan Warren
Dissertations, Theses, and Masters Projects
No abstract provided.
The Effects Of Conditioning The American Oyster (Crassostrea Virginica) With Tetraselmis Suecica And Cornstarch On The Growth, Vigor And Survival Of Its Larvae, Laura Lee Creekman
The Effects Of Conditioning The American Oyster (Crassostrea Virginica) With Tetraselmis Suecica And Cornstarch On The Growth, Vigor And Survival Of Its Larvae, Laura Lee Creekman
Dissertations, Theses, and Masters Projects
A comparison of effects of conditioning adult oysters (Crassostrea virginica) with Cornstarch and/or Tetraselmis suecica and raw water were determined on subsequent larval growth, vigor and successful metamorphosis. Possible correlations of lipid content of eggs and larval growth, vigor and metamorphosis was also examined. Results illustrated the effectiveness of Cornstarch when used as a supplemental conditioning agent for producing larvae and spat in greater quantity and of better quality than the other conditioning diets employed. Investigation revealed that lipid content of eggs is an important indicator for larval growth, vigor, set and successful metamorphosis. This dissertation is from the Joint …
The Effects Of Pollution On Benthic Communities Of The Tidal James River, Virginia, Robert J. Diaz
The Effects Of Pollution On Benthic Communities Of The Tidal James River, Virginia, Robert J. Diaz
Dissertations, Theses, and Masters Projects
Benthic communities in the estuarine portion of the James River are controlled mainly by salinity. Pollution effects are localized and difficult to assess because of the rigorous physical environment. Mesohaline and oligohaline communities were very similar to those in other east coast estuaries. except for the dominance of Rangia cuneata in the oligohaline zone. Communities of the tidal freshwater zone are most affected by pollution. In the areas of Richmond and Hopewell, where the major portion of the pollution load enters the river, communities are most severely depressed. Separate multivariate analyses of species distributional patterns, and pollution and physical parameters …
The Effects Of Environmental Variables On The Heart Rate Of Invertebrates, Peter L. Defur
The Effects Of Environmental Variables On The Heart Rate Of Invertebrates, Peter L. Defur
Dissertations, Theses, and Masters Projects
No abstract provided.
Effects Of Petroleum Hydrocarbons On Salt Marsh Communities, Carleton H. Hershner Jr.
Effects Of Petroleum Hydrocarbons On Salt Marsh Communities, Carleton H. Hershner Jr.
Dissertations, Theses, and Masters Projects
This dissertation is from the Joint Program Degree from the College of William & Mary and University of Virginia and awarded by the University of Virginia.
The effects of petroleum hydrocarbons on salt marsh grasses and gastropods were examined under three different circumstances. In the first study reported, a small pocket marsh was repeatedly dosed with small amounts of a No. 2 fuel oil. The second study investigated the effects of a large accidental spill of No. 6 fuel oil. The third study involved single doses of a fresh and a weathered crude oil on artificially enclosed segments of marsh.
The Prairie Naturalist Vol. 8, Nos. 3 And 4 September-December 1976
The Prairie Naturalist Vol. 8, Nos. 3 And 4 September-December 1976
The Prairie Naturalist
SPRING MORTALITY OF INSECTIVOROUS BIRDS IN SOUTHERN MANITOBA ▪ J. R. Serie and R. E. Jones
CHRISTMAS BIRD COUNTS FOR NORTH DAKOTA—1976 ▪ R. N. Randall
MOSSES OF THE GREAT PLAINS: INTRODUCTION AND CATALOGUE ▪ S. P. Churchill
NOTES
Fulvous Tree Duck in North Dakota ▪ L. A. Jones
Unusual Mortality of a Saw-whet Owl ▪ H. A. Kantrud
Cardinal and Mockingbird in Jamestown, North Dakota ▪ D. H. and J. E. Johnson
BOOK REVIEWS
Essence of Wilderness ▪ K. T. Killingbeck
The Changing America ▪ L. M. Kirsch
A Government Bird Book ▪ J. F. Cassel
Wildflowers ofthe Rockies …
Biological And Chemical Evaluation Of The Aquatic Environment Of Selected Undeveloped Kentucky Lake Embayments, Marshall Gordon, Morgan E. Sisk
Biological And Chemical Evaluation Of The Aquatic Environment Of Selected Undeveloped Kentucky Lake Embayments, Marshall Gordon, Morgan E. Sisk
KWRRI Research Reports
This report describes research involving biological and chemical analysis of two undeveloped embayments on Kentucky Lake, namely Anderson and Vickers Bays. Field and laboratory studies were made to assess current biotic standing crops, limnological conditions, levels of inorganic and organic pollutants in the embayments.
Leaf Epidermal Transmittance Of Ultraviolet Radiation And Its Implication For Plant Sensitivity To Ultraviolet-Radiation Injury, Ronald Robberecht
Leaf Epidermal Transmittance Of Ultraviolet Radiation And Its Implication For Plant Sensitivity To Ultraviolet-Radiation Injury, Ronald Robberecht
All Graduate Theses and Dissertations, Spring 1920 to Summer 2023
Leaf epidermal transmittance of ultraviolet radiation (280-400 nm) was examined in several plant species to determine the capability of the epidermis to attenuate solar ultraviolet radiation. Epidermal samples were mechanically isolated and examined with a spectroradiometer/integrating sphere for transmittance. A survey of 25 species exposed to natural insolation was conducted. Although the species differed in life form, habitat type, and epidermal characteristics, epidermal transmittance was generally less than 10%. Ultraviolet radiation was attenuated 95 to 99% in more than half of the species. In 16 species, flavonoid and related pigments in the epidermis accounted for 20 to 57% of the …
A Review Of The Limnology Of And Water Quality Standards For Lake Mead, Charles R. Goldman
A Review Of The Limnology Of And Water Quality Standards For Lake Mead, Charles R. Goldman
Publications (WR)
1. The waters of Las Vegas Bay, a heavily utilized recreational resource, receive discharges from a variety of municipal and industrial waste sources. The U.S. Environmental Protection Agency has determined, on the basis of numerous studies, that the present water quality violates state and federal standards and constitutes a public nuisance. Consultants have advised the Sewage and Wastewater Advisory Committee that rapid abatement of the alleged pollution conditions can be achieved by an advanced wastewater treatment (AWT) plant.
2. The major problems in Las Vegas Bay are an objectionable water color, excessive turbidity, noxious odors, and oxygen depletion in certain …
Report On Wastewater Disposal To Board Of County Commissioners, Clark County Nevada, Clair N. Sawyer
Report On Wastewater Disposal To Board Of County Commissioners, Clark County Nevada, Clair N. Sawyer
Publications (WR)
This report is concerned with the management of waste-waters and subsurface drainage from the City of Las Vegas and its environs and the BMI complex, all in Clark County, Nevada. The prime objective is to recommend a plan of action which will utilize the natural resources of the area in the least costly manner and still protect Lake Mead for recreational purposes and use as a public water supply, At this writing, conditions in the upper Las Vegas arm of Boulder Basin are quite unsatisfactory for some recreational purposes due to the extensive blooms of algae which develop. Experience at …
A Comparative Study Of A Salt Water Impoundment With Its Adjacent Tidal Creek Pertinent To Culture Of Crassostrea Virginica (Gmelin), William D. Anderson Iii
A Comparative Study Of A Salt Water Impoundment With Its Adjacent Tidal Creek Pertinent To Culture Of Crassostrea Virginica (Gmelin), William D. Anderson Iii
OES Theses and Dissertations
Certain physical, chemical and biological characteristics associated with the culture of subtidal Crassostrea virginica were assessed in a salt water impoundment and its adjacent tidal feeder creek. Large seed oysters (initial y = 57.3 mm) were transferred from a somewhat polluted estuary of Charleston Harbor to floating, mid-water, and bottom hardware cloth trays (200/tray) in a four hectare pond. Identical trays at comparable depths were placed in the tidal creek and each location was sampled monthly for growth and survival. Surface and bottom water samples were collected weekly throughout the study and hourly during four seasonal 25 hour stations. Standard …