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Articles 37621 - 37650 of 39785
Full-Text Articles in Physical Sciences and Mathematics
Modifying Fertiliser Practices, J S. Yeates, D. M. Deeley, M. F. Clarke, D. Allen
Modifying Fertiliser Practices, J S. Yeates, D. M. Deeley, M. F. Clarke, D. Allen
Journal of the Department of Agriculture, Western Australia, Series 4
If modified fertiliser practices are adopted phosphorus losses from the Peel-Harvey catchment can be reduced. Farmers can save money on fertiliser applications and the need for more expensive catchment management measures to reduce algal pollution of the estuary will be avoided.
Research data available so far indicate that, with farmer co-operation and the use of the new slow release fertiliser New Coastal Superphosphate, long-term phosphorus application rates can be reduced by 30-40 per cent - and possibly even halved - without lowering agricultural production. This will also reduce phosphorus loss to drainage water.
Although much of the research since 1982 …
Soil Improvement With Bauxite Residues, W H. Tacey, S. C. Ward, K. J. Summers, N. J. Barrow
Soil Improvement With Bauxite Residues, W H. Tacey, S. C. Ward, K. J. Summers, N. J. Barrow
Journal of the Department of Agriculture, Western Australia, Series 4
The sandy soils of the Peel-Harvey catchment hold water and nutrients very poorly. The Gavin ridges dry out quickly during rainless periods and this severely limits pasture growth. These ridges and the lower lying Joel and Coolup sands also lose a large proportion of the phosphorus, sulfer and potash fertilisers applied to them. Normally the sands lack clay materials to bind and hold the nutrients so rainfall leaches them out.
The Peel-Harvey Study Group, CSIRO, Alcoa and Murdock University have studied the use of a residue from bauxite mining to help overcome these problems. The treated residue has a texture …
Alternative Pasture Species For Deep Sands, D A. Nicholas
Alternative Pasture Species For Deep Sands, D A. Nicholas
Journal of the Department of Agriculture, Western Australia, Series 4
Although the climate of the swan coastal plain between Perth and Bunbury is suitable for growing a range of pasture species, some soil types greatly limit this range.
Pasture species commonly grown in the South-West, such as subteranean clover and annual ryegrass, can only be grown successfully on the better soils of the coastal plain - the loams, yellow sands and Joel sands. On the freely drained, deep, infertile Gavin sands such species rarely persist because of the soil's poor water holding capacity, and its water repellency and its poor ability to retain nutrients.
Alternative Land Uses, D A. Morrison, B. C. Mattinson
Alternative Land Uses, D A. Morrison, B. C. Mattinson
Journal of the Department of Agriculture, Western Australia, Series 4
One aproach to minimise the high nutrient content and associated algal pollution of the Peel-Harvey estuarine system is to reduce phosphorus losses at their source. Farmers can do this by changing land use is such a way thar phosphorus run-off fromthe catchment soils into drainage is prevented or at least reduced.
The department of Agriculture is investigating the economics of alternative uses, particularly substituting forestry with Pinus pinaster or Eucalyptus globulus (Tasmanian blue gum) for present beef and sheep enterprises. P. pinaster is used for logging and E. globulus for pulping.
Tackling The Problem Off The Farm, C M. Croft
Tackling The Problem Off The Farm, C M. Croft
Journal of the Department of Agriculture, Western Australia, Series 4
Methods of redusing phosphorus losses from the catchment soils of the Peel-Harvey esturine system have been discussed in other articles in this Journal.
This article briefly discusses a range of 'off the farm' techniques to improve phosphorus flushing from Peel Inlet or Harvey Estuary to the sea and to treat the phosphorus and the algae. These techniques were among more than 100 management options evaluated by the Peel-Harvey Study Group.
Soil Acidity And Legume Nodulation, J G. Howieson, M. A. Ewing
Soil Acidity And Legume Nodulation, J G. Howieson, M. A. Ewing
Journal of the Department of Agriculture, Western Australia, Series 4
Nitrogen is a basic constituent of protien and is essential to all forms of life. Many agricultural plants are legumes - a group of plants which, in co-operation with specialised soil bacteria, fix their own nitrogen from the air. When the legume dies, the organic matter breaks down anf the nitrogen becomes available to the following crops.
Soil acidity is a major factor limitimg the successful association between legumes and their beneficial soil bacteria in Western Australia.
Molybdenum Deficiency In The Wheatbelt, M M. Riley
Molybdenum Deficiency In The Wheatbelt, M M. Riley
Journal of the Department of Agriculture, Western Australia, Series 4
The trace element molybdenum is needed in very small amounts in nitrogen metabolisms of crops and pastures. One of the projects that started as a result of the overall soil acidity research programme was the examination of molybdenum deficiency on acid soils throughout the South-West of Western Australia.
Soil Acidity In The Eastern Wheatbelt, W M. Porter, I. R. Wilson
Soil Acidity In The Eastern Wheatbelt, W M. Porter, I. R. Wilson
Journal of the Department of Agriculture, Western Australia, Series 4
In Western Australia parts of the sandplain of the eastern wheatbelt are very acid and produce poor crops, It was not until the late 1970s that the effect of soil acidity on the productivity of the sandplain soils was examined in any detail.
Since then researchers have learnt a great deal about the nature of soil acidity in the eastern wheatbelt sandplain soils and can suggest management options for farmers.
This article discisses the problem of the very acid soils. It does not deal with the moderately acid, medium textured soils of the eastern wheatbelt. Although the acidity of these …
Barley Production And Soil Acidity, P J. Dolling, W. M. Porter
Barley Production And Soil Acidity, P J. Dolling, W. M. Porter
Journal of the Department of Agriculture, Western Australia, Series 4
One of the causes of reduced plant yields on acid soils is aluminium toxicity. because barley is extremely sensitive to this mineral, a project started last year to examine the influence of soil acidity on barley production in the main barley growing areas of Western Australia.
This article discusses some of the background information on the project and its aims.
Soil Acidity On High Rainfall Pastures, J S. Yeates, D. A. Mcghie, I. R. Wilson
Soil Acidity On High Rainfall Pastures, J S. Yeates, D. A. Mcghie, I. R. Wilson
Journal of the Department of Agriculture, Western Australia, Series 4
Most soils of the high rainfall area of south-western Western Australia are naturally acis.
The most acid group of soils, the peaty sands. have been routinely limed before subterranean clover pastures were established since research in the 1950s showed that poor Rhizobium nodulation could be overcome with the application of about 2 tonnes per hectare of coastal limesand.
Soil Acidity And Liming In The Lower Great Southern, R N. Glencross, M. G. Clarke
Soil Acidity And Liming In The Lower Great Southern, R N. Glencross, M. G. Clarke
Journal of the Department of Agriculture, Western Australia, Series 4
In the 375 to 750 millimetre rainfall area of the Lower Great Southern, reports of loss of subterranean clover from established pastures, reduced carrying capacity for sheep and increasing soil acidity lead to the establishment in 1981 of a research programme into the effects of soil acidity on pasture productivity in that region.
Breeding Wheat Varieties For Acid Soils, I R. Barclay
Breeding Wheat Varieties For Acid Soils, I R. Barclay
Journal of the Department of Agriculture, Western Australia, Series 4
Wheat varieties with improved tolerance of acid soils cold increase yeilds be perhaps 20 per cent or more over a substantialarea ofWestern Australia's eastern wheatbelt.
Aluminium toxicity is probably the main cause of poor root growth and therefore reduced yields on these soils.
Applications Of Aerial Imagery In Identification Of Natural Areas, Kendall Duane Wessel
Applications Of Aerial Imagery In Identification Of Natural Areas, Kendall Duane Wessel
Dissertations and Theses @ UNI
There is current interest in utilizing aerial imagery to obtain information on natural vegetation. The purpose of this study is to utilize and evaluate commonly available aerial imagery to identify potential natural areas suitable for preservation and to initiate development of a procedure for imagery interpretation to meet this goal.
Clayton County, located in the northeastern quarter of the state of Iowa, was selected for study because it is dissected by steep, narrow stream valleys that are unsuitable for cultivation and may still possess native vegetation of a quality suitable for preservation.
Baseline or control communities were selected from known …
Oyster Spatfall In Virginia Rivers: 1983 Annual Summary, James Whitcomb
Oyster Spatfall In Virginia Rivers: 1983 Annual Summary, James Whitcomb
Reports
The Virginia Institute of Marine Science (VIMS) conducts weekly surveys from June through early October to obtain oyster spatfall information. Spat counts are made on 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 ~:he spawning season to determine the potential of a particular area for receiving a strike and to predict the most likely period tile strikes will occur. A moderate or heavy strike on shellstrings usually indicates a significant strike on exposed bottom clutch. This is especially true for clutch planted a …
Geologic Responses To Late Cenozoic Marine Transgressions In The Poropotank River Estuary, Virginia, Martin Lane Mitchell
Geologic Responses To Late Cenozoic Marine Transgressions In The Poropotank River Estuary, Virginia, Martin Lane Mitchell
Dissertations, Theses, and Masters Projects
No abstract provided.
Episodic Nutrient Supply To A Kelp Forest Ecosystem In Southern California, Richard C. Zimmerman, James N. Kremer
Episodic Nutrient Supply To A Kelp Forest Ecosystem In Southern California, Richard C. Zimmerman, James N. Kremer
OES Faculty Publications
Temporal patterns of nutrient input into a Southern California kelp forest were measured using traditional hydrocast sampling coupled with high frequency temperature profiling. Patterns of nutrient input were related to growth rates of Macrocystis pyrifera located in an adjacent kelp forest. There were 2 distinct components to the pattern of nutrient availability. The long term, or seasonal, component was consistent with large-scale storm-induced mixing and horizontal advection during winter months. In addition, vertical motions of the thermocline, bringing nutrients into the kelp forest, occurred throughout the year with a frequency of about 2 per day and were strongest during the …
Review Of Upwelling Off The Southeastern United States And Its Effect On Continental-Shelf Nutrient Concentrations And Primary Productivity, Larry P. Atkinson, James A. Yonder, Thomas N. Lee
Review Of Upwelling Off The Southeastern United States And Its Effect On Continental-Shelf Nutrient Concentrations And Primary Productivity, Larry P. Atkinson, James A. Yonder, Thomas N. Lee
CCPO Publications
Gulf Stream induced upwelling occurs along the length of the southeastern United States continental shelf break. Upwelling events are produced by northward propagating Gulf Streams frontal meanders and eddies and travel northwards with these features. Meanders and eddies occur throughout the year in a period band of 2-14 days; however, resultant upwellings can affect the shelf quite differently. During fall, winter, and spring, upwelling is restricted to the outer shelf by cross-shelf density distributions, but in the summer upwelled water may penetrate across as a subsurface intrusion if aided by upwelling-favorable winds. If water does penetrate across the shelf, it …
Nitrogen Flows From Several Species And Varieties Of Legume, John Hamblin Dr
Nitrogen Flows From Several Species And Varieties Of Legume, John Hamblin Dr
Experimental Summaries - Plant Research
Trial 83C24: N flows from several species and varieties of legume.
Trial 83C27: The effect of seeding rate, planting and variety on the residual value of lupins.
Trial 84C25: Small rotation trial for 1985.
Trial 84C34: Nitrogen response on large rotation plots at ECRS.
These trials were carried out in collaboration with: Mr R. Delane, and with assistance from: Mr. T. White, Ms. A. Bishop.
Soil Conservation Research In New South Wales And Its Significance To Research On Water Erosion In Western Australia, D J. Mcfarlane
Soil Conservation Research In New South Wales And Its Significance To Research On Water Erosion In Western Australia, D J. Mcfarlane
Resource management technical reports
No abstract provided.
Water Erosion On Potato Land During The 1983 Growing Season Donnybrook, D J. Mcfarlane
Water Erosion On Potato Land During The 1983 Growing Season Donnybrook, D J. Mcfarlane
Resource management technical reports
Soil losses over a three month period varied from 10 to 49 mm.. Soil loss was most highly correlated with length of slope of the plots. Other important factors appeared to be slope angle and soil textures. Grade furrows appear to be the best method of breaking-up long slope lengths. The low capacity of the furrows requires them to be on grades of about 4 to 4 per cent to prevent siltation and overtopping during high density storms.
Recommendations & Proposals For A Fire Management Control Programme For The Beekeepers' Reserves And Areas Of Adjacent Crown Land, R C. Burking
Apiculture research reports
No abstract provided.
Damage Report Of The West Coastal Wildfire (Jan 16-21, 1984) And Its Effects On The Western Australian Beekeeping Industry, R C. Burking, A. C. Kessell
Damage Report Of The West Coastal Wildfire (Jan 16-21, 1984) And Its Effects On The Western Australian Beekeeping Industry, R C. Burking, A. C. Kessell
Apiculture research reports
No abstract provided.
Evaluation Of Carbon-14 Uptake Algal Toxicity Assay And Its Application In Field Assessment Of Tributyltin Chloride And Chlorinated Sewage Toxicities, Soon Lin Ho
Dissertations, Theses, and Masters Projects
No abstract provided.
The Marine Biogeochemistry Of Selenium: A Re-Evaluation, Gregory A. Cutter, Kenneth W. Bruland
The Marine Biogeochemistry Of Selenium: A Re-Evaluation, Gregory A. Cutter, Kenneth W. Bruland
OES Faculty Publications
Vertical and horizontal profiles from the North and South Pacific Oceans demonstrate the existence of three species of dissolved selenium: selenite, selenate, and organic selenide (operationally defined). In surface waters, organic selenide makes up about 80% of the total dissolved selenium, selenite concentrations are uniformly low, and selenate concentrations rise with increased vertical mixing. The organic selenide maximum (thought to consist of seleno-amino acids in peptides) coincides with the maxima of primary productivity, pigments, bioluminescence, and dissolved free amino acids. Deep ocean waters are enriched in selenite and selenate, while organic selenide is nondetectable. In suboxic waters of the tropical …
The Distribution And Abundance Of The Bottlenose Dolphin, Tursiops Truncatus In Virginia, Robert A. Blaylock
The Distribution And Abundance Of The Bottlenose Dolphin, Tursiops Truncatus In Virginia, Robert A. Blaylock
Dissertations, Theses, and Masters Projects
No abstract provided.
Nanoplankton Dynamics In A Salt Marsh-Mudflat Ecosystem, Helena Maria Galvaeo
Nanoplankton Dynamics In A Salt Marsh-Mudflat Ecosystem, Helena Maria Galvaeo
Dissertations, Theses, and Masters Projects
No abstract provided.
Antibody Production In Spot (Leiostomus Xanthurus Lacepede): A Model To Test The Impact Of Elizabeth River Sediments On The Humoral Immune System Of Fish, Catherine Nancy Pourreau
Antibody Production In Spot (Leiostomus Xanthurus Lacepede): A Model To Test The Impact Of Elizabeth River Sediments On The Humoral Immune System Of Fish, Catherine Nancy Pourreau
Dissertations, Theses, and Masters Projects
No abstract provided.
Synthesis And Characterization Of Some Oxoperoxopolycarboxylato Vanadates (V) And Their Biochemical Significance, Myunghi Lee
Synthesis And Characterization Of Some Oxoperoxopolycarboxylato Vanadates (V) And Their Biochemical Significance, Myunghi Lee
Dissertations, Theses, and Masters Projects
No abstract provided.
The Prairie Naturalist Volume 15, No. 4. December 1983
The Prairie Naturalist Volume 15, No. 4. December 1983
The Prairie Naturalist
Paul B. Kannowski, Editor
Nikki R. Seabloom, Assistant Editor
Douglas H. Johnson, Book Review Editor
TABLE OF CONTENTS
ASPECTS OF THE NESTING ECOLOGY OF LEAST TERNS AND PIPING PLOVERS IN CENTRAL NEBRASKA ▪ C. A. Faanes
LEAD SHOT INCIDENCE IN SANDHILL CRANES COLLECTED FROM ALASKA, CANADA, AND TEXAS ▪ B. M. Wallace, R. J. Warren and G. D. Gaines
LEAD SHOT INCIDENCE IN WATERFOWL COLLECTED FROM THE TEXAS HIGH PLAINS ▪ B. M. Wallace, R. J. Warren and R. J. Whyte
SMALL MAMMALS OF WINTER WHEAT AND GRAIN SORGHUM CROPLANDS IN WEST-CENTRAL KANSAS ▪ K. W. Navo and E. D. …
The Joint Venture Controversy: A Short-Term Solution For A Long-Term Fisheries Policy, Laurie A. Frost
The Joint Venture Controversy: A Short-Term Solution For A Long-Term Fisheries Policy, Laurie A. Frost
Marine Affairs Theses and Major Papers
This paper will examine the development of joint ventures under the FCMA, the legislative and regulatory measures designed to control these ventures and the procedures for establishing a joint venture. More recent developments in joint venture policy will be examined, including the controversy over squid joint ventures on the East Coast, to determine what the objectives are and what current policy is regarding join ventures. The debate between harvesters and processors will be put forth as a way of summarizing the costs and benefits of joint ventures to the industry as a whole.