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Articles 38731 - 38760 of 39774
Full-Text Articles in Physical Sciences and Mathematics
Grain Moisture And The Weather : What Can The Records Tell Us?, M W. Perry, P. A. Fievez
Grain Moisture And The Weather : What Can The Records Tell Us?, M W. Perry, P. A. Fievez
Journal of the Department of Agriculture, Western Australia, Series 4
The expansion of cereal production in areas along the south coast has exposed harvesting problems associated with high grain moisture.
A grain delivery standard of 12 per cent moisture means that, in the absence of grain drying facilities, harvesting times in the field are restricted to those hours when grain moisture falls below this figure.
Grain moisture, however, remains the major problem and for planning purposes, producers require an estimate of the harvesting time available in a given year. This will depend on all the climatic variables which affect grain moisture. These include rainfall and dew which deposit water directly …
The Place Of Lucerne In Western Australian Agriculture, N J. Halse, C. M. Francis
The Place Of Lucerne In Western Australian Agriculture, N J. Halse, C. M. Francis
Journal of the Department of Agriculture, Western Australia, Series 4
Lucerne, the world's most important fodder legume, has never won largescale acceptance in West Australian farming, largely because of our success with productive subterranean clover pastures. But recent disease problems on sub. clover stands have led to greater interest in alternative species, especially lucerne, for higher rainfall areas.
This article summarises our knowledge of lucerne establishment and management in W.A. and reviews current research aimed at achieving better results from lucerne.
Forage Production From Shrubs On Saline Land, C V. Malcolm
Forage Production From Shrubs On Saline Land, C V. Malcolm
Journal of the Department of Agriculture, Western Australia, Series 4
In the first volume of the Journal of the Department of Agriculture in the year 1900, the results of experiments at Tulare Experiment Station in California on the growing of Australian saltbushes are reported.
Seed was first sent from Australia by Baron von Mueller in June, 1881. Three species of saltbush (A. semibaccata, A. numularia and A. vesicaria) are all reported to have grown well.
Although C. A. Gardner in 1929 suggested the growing of saltbushes for forage, the earliest and clearest recommendations are those of Teakle and Burvill in 1945.
Early research tended to concentrate mainly on the possibility …
Interim Summary 1974 Experiments, M L. Poole
Interim Summary 1974 Experiments, M L. Poole
Experimental Summaries - Plant Research
Data presented for: 74MT38 - Variety Trial - New rape and radish varieties 74MT27 - Rates of seed, time of planting on Crambe abyssinica 74GE'1 ·- Time of Seeding X Rate of Nitrogen on Sunflowers. Oilseed and Grain Legumes under Summer Irrigation. Sunflower Progress Report. Safflower Progress Report. Response of Oilseed Crops to Climate. Introduction - The results given in this report provide an interim record of 1974 experimental work with oilseed crops. An essential part of oilseed trial programme is an evaluation of the quantity and quality of oil produced by different species and varieties under a range of …
Summary Of Experimental Results - Wheat Protein Survey, R Weir
Summary Of Experimental Results - Wheat Protein Survey, R Weir
Experimental Summaries - Plant Research
Wheat protein survey Seeding rate x grain protein - 72NA33. Seeding rate x grain protein - 72M28. Temperature effects on flower set of lupin - 72GL4. Wheat protein survey - A survey of 130 farmers in 13 Shires of the high protein area around Merredin was undertaken in the few weeks prior to the 1972 harvest. Grain samples were forwarded by farmers after supplying site data including yield estimate. A soil sample was collected on which % soil N was determined. This information together with grain protein percentage was included in multiple regression, and stepwise regression analyses.
Long Term Rotation Trials - Annual Summary Of Results 1975, Ian Rowland
Long Term Rotation Trials - Annual Summary Of Results 1975, Ian Rowland
Experimental Summaries - Plant Research
Long term rotation trials: Results are the yield of grain harvested from crops grown after various lengths of pasture ley. W56H, 66M29, 67C13, 67N4, 68SG5,
Phytoplankton Distribution And Water Quality Indices For Lake Mead (Colorado River), Robert D. Staker, Robert W. Hoshaw, Lorne G. Everett
Phytoplankton Distribution And Water Quality Indices For Lake Mead (Colorado River), Robert D. Staker, Robert W. Hoshaw, Lorne G. Everett
Publications (WR)
Phytoplankton samples were collected in Lake Mend 6 times from September 1910 to June 1971 for 8 stations at depths of 0. 3, 5, 10, 20, and 30 m. These samples were processed through a Millipore filter apparatus and 79 planktonic algae were identified. Algal divisions represented were Bacillariophyta, 42 species; Chlorophyta, 18 ; Cyanophyta, 9; Chrysophyta, 3; Cryptophyta, 3; Pyrrophyta, 2; and Euglenophyta, 2. Blue-green algae were dominant in late summer and fall; green algae, diatoms, and, cryptomonads in winter; and green algae in spring. The early summer flora was best represented by the Chlorophyta, Cryptophyta, and Chrysophyta. Palmer's …
Animal-Sediment Relations In A Tropical Lagoon: Discovery Bay, Jamaica, Robert C. Aller, Richard E. Dodge
Animal-Sediment Relations In A Tropical Lagoon: Discovery Bay, Jamaica, Robert C. Aller, Richard E. Dodge
Marine & Environmental Sciences Faculty Articles
The distribution of many macrobenthic species in the back-reef lagoon of Discovery Bay, Jamaica can be related to a gradient in bottom stability. This gradient is defined by increasing rates of biogenic reworking and sediment resuspension in the western part of the lagoon. Infaunal diversity and coral growth decrease in the western, unstable areas. The infauna of the carbonate sand consists mainly of deposit feeders. In the western lagoon, the feeding activities of this group result in high biogenic reworking rates (up to 6-7 cm/week) producing loose surface sediment easily resuspended by waves. A maximum, mean resuspension rate of 19 …
1974 Trace Element Nutrition, J. W. Gartrell
1974 Trace Element Nutrition, J. W. Gartrell
Experimental Summaries - Plant Research
1 • Mineral nutrition of sweet lupins 74M031, 74M032, 74M033, 74M034, 74M035, 74M036, 74M09, 74M038, 74BA15, 74BA16, 74BA17, 74BA18, 74AL20, 74JE19, 74ES27, 74ES28, 74E17, 74TS26, 74TS27, 74N028, (See Cox's Report)
2. Barley nutrition 74TS29.
3. Cu Zn Residual 74AL19, 66N14 (incomplete)
4. Cu or requirement of cattle 74GE30 (See May and Barker, Animal Production Report)
5. Co on sheep Badgingarra trial (See Croker's Report)
Samphire For Waterlogged Salt Land, C V. Malcolm, G. J. Cooper
Samphire For Waterlogged Salt Land, C V. Malcolm, G. J. Cooper
Journal of the Department of Agriculture, Western Australia, Series 4
For non-waterlogged and mildly waterlogged salt land a number of salt-tolerant shrubs may be used for forage production.
Areas which are highly saline and regularly waterlogged are not suited to these shrubs. However, during trials with shrub species, samphires (Arthrocnemum spp.) were found to volunteer and grow well on these sites.
Research into the use of samphires has shown that it is possible to harvest seed and obtain a seed sample suitable for sowing through a drill. Established samphire stands provide useful grazing in many parts of the Western Australian wheatbelt.
Limnological, Ichthyological, And Parasitological Investigations On Arkansas Reservoris In Relation To Water Quality, John S. Carter, Carl E. Hoffman, Larry L. Olmsted, Raj V. Kilambi, Donald G. Cloutman, David A. Becker
Limnological, Ichthyological, And Parasitological Investigations On Arkansas Reservoris In Relation To Water Quality, John S. Carter, Carl E. Hoffman, Larry L. Olmsted, Raj V. Kilambi, Donald G. Cloutman, David A. Becker
Technical Reports
Lake Fort Smith, a 525 acre (212 ha) reservoir, was impounded in 1936 as a water supply for the city of Fort Smith. The reservoir is located on Clear Creek (Frog Bayou), a tributary of the Arkansas River, in the Boston Mountains 28 miles (45 km) northeast of the city of Fort Smith in Crawford County, Arkansas. A map and morphometric characteristics of Lake Fort Smith are given in Fig. 1 and Table I (Hoffman, 1951; Nelson, 1952). In 1956 Lake Shepherd Springs, a 750 acre (304 ha) impoundment, was created one mile upstream of Lake Fort Smith (Rorie, 1961). …
Hydroids Of The Pelagic Sargassum Community Of The Gulf Stream And Sargasso Sea, David Holland Rackley
Hydroids Of The Pelagic Sargassum Community Of The Gulf Stream And Sargasso Sea, David Holland Rackley
Dissertations, Theses, and Masters Projects
No abstract provided.
Clover Scorch: Summary Of 1974 Experiments, D. L. Chatel
Clover Scorch: Summary Of 1974 Experiments, D. L. Chatel
Experimental Summaries - Plant Research
Experiments reported in this summary were conducted jointly with CM Francis. 1. Variety Screening - During 1974, two hundred and fifty-four varieties were screened for resistance to Kabatiella caulivora in small plots at Denmark. The test varieties included 49 that showed up as promising in previous years. The remainder included all the untested accessions for which sufficient seed was available. There were 239 sub. sp. Subterranean, 14 sub, sp. Yanninicum and 1 Brachycalycinum... - The plots were periodically inoculated with infected debris and rated for disease severity on a number of occasions. Lists of the most and least resistant clovers …
Nitrogenous Fertilisers For Cereals: Results From 1974 Trials With Wheat, Barley And Oats, M G. Mason
Nitrogenous Fertilisers For Cereals: Results From 1974 Trials With Wheat, Barley And Oats, M G. Mason
Experimental Summaries - Plant Research
74A1, 74A3, 74AL5, 74AL4, 74C3, 74E2, 74ES31, 73GLI, 74JE1, 74JE2, 74LG1, 74LG2, 74LG3, 74LG6, 61M11, 74MT17, 74NO1, 74NO2, 74WH2.
Acute Effect Of Free Chlorine On Selected Estuarine Invertebrates And Vertebrates : Final Report, Morris H. Roberts, Robert J. Diaz
Acute Effect Of Free Chlorine On Selected Estuarine Invertebrates And Vertebrates : Final Report, Morris H. Roberts, Robert J. Diaz
Reports
The objective of this project was to determine acute toxic effects of chlorine on selected estuarine organisms found adjacent to the projected outfall of a sewage treatment plant in the lower York River. The test species specified under contract were ovster (Crassostrea virginica) and clam (Mercenaria mercenaria) larvae, Acartia tonsa (a dominant copepod), and the fishes, menhaden (Brcvoortia tyranus), pipefish (Svngnathus fuscus), blennies (Hypsoplennius hentzi) and sheepshead minnow (Cyprinodon variegatus). The parameter of interest in the tests was mortality when the animals were exposed to a constant level of chlorine for a 48 or 96 hr period.
A Diurnal Zooplankton Migration Study In Lake Mead, Robert D. Staker
A Diurnal Zooplankton Migration Study In Lake Mead, Robert D. Staker
Publications (WR)
The diurnal vertical movement of zooplankton was first recorded in freshwater lakes by Weismann (1877) in Lake Constance (Bodensee), although Cuvier was credited with observing the migration of Daphniae in 1817 (Gushing, 1955). The migration is best observed in deep oligotrophic lakes and migrations of 50 m per day are described (Worthington, 1931). In addition, two species of chaetognaths are reported to migrate 400 m a day in marine waters off of Lisbon (Waterman and Berry, 1967) while Birge (1895) found little evidence of the phenomenon at all in Lake Mendota, Wisconsin.
Most zooplankton that migrate rise at night and …
Factors Contributing To Production And Distribution Of Chihuahuan Desert Annuals, Paul D. Whitson
Factors Contributing To Production And Distribution Of Chihuahuan Desert Annuals, Paul D. Whitson
Memorandum
No abstract provided.
Population Structure, Foraging Behavior And Daily Movements Of Certain Sonoran Desert Birds, S. M. Russell, P. J. Gould
Population Structure, Foraging Behavior And Daily Movements Of Certain Sonoran Desert Birds, S. M. Russell, P. J. Gould
Memorandum
No abstract provided.
Life: A Computer Program For Stochastic Life Table Analysis, C. Romesburg, K. Marshall
Life: A Computer Program For Stochastic Life Table Analysis, C. Romesburg, K. Marshall
Memorandum
No abstract provided.
Phenology And Function Of Sonoran Desert Annuals In Relation To Environmental Changes, Duncan T. Patten, Edward M. Smith
Phenology And Function Of Sonoran Desert Annuals In Relation To Environmental Changes, Duncan T. Patten, Edward M. Smith
Memorandum
No abstract provided.
Interaction Between A Fossorial Rodent (The Pocket Gopher, Thomomys Bottae) And A Desert Plant Community, Ross E. Dingman, Lex Byers
Interaction Between A Fossorial Rodent (The Pocket Gopher, Thomomys Bottae) And A Desert Plant Community, Ross E. Dingman, Lex Byers
Memorandum
No abstract provided.
Model For Estimating Water, Salt And Temperature Distribution In The Soil Profile, R. A. Griffin, R. J. Hanks, S. Childs
Model For Estimating Water, Salt And Temperature Distribution In The Soil Profile, R. A. Griffin, R. J. Hanks, S. Childs
Memorandum
No abstract provided.
Tucson Basin Validation Site, J. L. Thames
A Preliminary Submodel Of Carbon Translocation, W. Valentine, M. Ayyad
A Preliminary Submodel Of Carbon Translocation, W. Valentine, M. Ayyad
Memorandum
No abstract provided.
The Consumption, Utilization And Modification Of Nutritional Resources By The Jackrabbit (Lepus Californicus) In The Mohave Desert, V. H. Shoemaker, K. A. Nagy, W. R. Costa
The Consumption, Utilization And Modification Of Nutritional Resources By The Jackrabbit (Lepus Californicus) In The Mohave Desert, V. H. Shoemaker, K. A. Nagy, W. R. Costa
Memorandum
No abstract provided.
Soil As A Factor In Modelling The Phosphorus Cycle In The Desert Ecosystem, J. J. Jurinak, R. L. Evans
Soil As A Factor In Modelling The Phosphorus Cycle In The Desert Ecosystem, J. J. Jurinak, R. L. Evans
Memorandum
No abstract provided.
Effect Of Soil Water Potential On Soil Moisture Absorption, Transpiration Rate, Plant Water Potential, And Growth Of Artemisia Tridentata, Gaylon S. Campbell, Grant A. Harris
Effect Of Soil Water Potential On Soil Moisture Absorption, Transpiration Rate, Plant Water Potential, And Growth Of Artemisia Tridentata, Gaylon S. Campbell, Grant A. Harris
Memorandum
No abstract provided.
Composition And Biomass Contribution Of Lichen And Moss Communities In The Hot Desert Ecosystems, Thomas H. Nash Iii, Sally White, Janet M. Nash
Composition And Biomass Contribution Of Lichen And Moss Communities In The Hot Desert Ecosystems, Thomas H. Nash Iii, Sally White, Janet M. Nash
Memorandum
No abstract provided.
Deep Creek Validation Study: Results Of Data Search For Aquatic Model, G. W. Minshall, J. Perry Ii, S. Walrath, C. Nimz, M. Mcsorley, J. Brock
Deep Creek Validation Study: Results Of Data Search For Aquatic Model, G. W. Minshall, J. Perry Ii, S. Walrath, C. Nimz, M. Mcsorley, J. Brock
Memorandum
No abstract provided.
Curlew Valley Validation Site, D. F. Balph, R. S. Shinn, R. D. Anderson, C. Gist
Curlew Valley Validation Site, D. F. Balph, R. S. Shinn, R. D. Anderson, C. Gist
Memorandum
No abstract provided.