Earth Sciences Commons^™

The Effect Of Soil Acidity On Barley, P J. Dolling, T. D. Haines

Experimental Summaries - Plant Research

Three liming experiments were established to confirm previous estimates of the critical soil acidity level for barley. Two experiments studying the effect of depth of incorporation on the effectiveness of lime, established in 1986, were continued in 1987.
The results from the three liming experiments established this year supported the conclusion that barley is affected by soil acidity at pH's around 4.2 and 4.3 (CaC1₂) and that depth of this acid layer is important.
Significant lime responses were obtained at the Katanning depth of lime incorporation site but conclusions can not be made because of possible mixing of …

Grain Legumes Evaluation., G. H. Walton, T. R. Trent

Experimental Summaries - Plant Research

Lupin agronomy, 87AL14. Nitrogen fertilizer for legume crops, 87BA2. Pea variety evaluation, 87C59, 87M08, 87ME1, 87N012, 87SG8, 87KA7, 87N2. Interstate pea variety trials, 87N096, 87N099, 87KA6. Disease Resistance Pea Variety Testing, 87JE1. Grain legume species comparisons, 87A2, 87C2, 87KA37, 87M09, 87MA1, 87NA15. Legume species variety trials, 87LG2. Faba bean evaluation, 87MC34 and 87KA8. Faba bean 'synthetic' variety yield trial, 87MC36. Faba bean screening nursery, 87MC35. Preliminary agronomy of faba bean, chickpea and lentil, 87A21. Seeding date, 87A22. Legume species herbicide tolerance, 87KA82.

Field Pea Agronomy., I. A. Pritchard, G. Cooper, D. Dodge

Experimental Summaries - Plant Research

Field peas sowing rates, 87A31. Field peas time of sowing, 87A32. Field peas factional agronomy, 87A33. Field pea sowing rates, 87N092. Field peas time of sowing, 87N093. field peas - factorial agronomy, 87N094.

Depth-Controlled Modified Combine For Direct Drilling And Lupin Row Spacing., R. Belford, G Reithmuller

Experimental Summaries - Plant Research

Trial 87WH52, (86M56)

Depth-controlled modified combine for direct drilling.

To compare soil penetration resistance, crop growth, water use, nutrient uptake and root development of wheat 1) sown after scarifying; 2) direct drilled with a combine; 3) direct drilled with the depth-controlled modified combine with loosening ties at 5, 9 or 13 cm; or 4) sown after deep ripping with an Agrowplow to 13 or 30 cm.

Trial 87M82

Location: Merredin Research Station paddock T6 south.

Lupin row spacing

Experiments On Grain Yield In A Range Of Old And Modern Wheat Varieties., K. H.M. Siddique, D. Tennant, R. K. Belford, M. W. Perry, L. Mclaughlin, A. R. Thompson

Experimental Summaries - Plant Research

Growth, yield, water use and water use efficiency of old and modern wheat varieties in a mediterranean type environment, 87M17 and 87WH14. Ear and stem dry matter at anthesis and grain yield in a range of wheat varieties, 87M18.

The Role Of Barley In Future Rotational Systems In Drier Wheatbelt Areas Of Western Australia., P. Simpson

Experimental Summaries - Plant Research

Comparison of barley and wheat yields over four soil types and yield component analysis at Nangeenan NW of Merredin, 86ME88, 86ME89, 86ME90 and 86ME91. Comparison of barley and wheat yields over four soil types at Bodallin, east of Merredin, 86ME92, 86ME93, 86ME94 and 86ME95. Comparison of barley and wheat yields over two ‘levels’ of soil salinity - EC, 87ME63 and 87ME64. Comparison of barley and wheat yields over 2 soils of differing textural type – ‘heavy’ and ‘light’, 87ME65 and 87ME66. Effect of time of sowing on barley and wheat yields, 87ME67.

Trial 67c13, I Rowland, W Hawkins

Experimental Summaries - Plant Research

Trial 67C13. Location paddock 19B on Chapman Research Station (Nabawa).
Long term rotation trials.

An old land site, cleared in 1903. Sown to Dwalganup sub clover in 1964, topdressed each year until the start of the trial in 1967. In 1981 to 83 all plots were reseeded with Northam at 20 kg/ha.

Seed Rate And Nitrogen On Wheat, J W. Bowden

Experimental Summaries - Plant Research

Trial 87MO49

Location: Wannamal

To examine the economic choice of nitrogen and seeding rates in a leaching situation with a high yield potential.
To test the nitrogen section of NP-Decide.
To gather data that enables competition for resources to be examined by regarding the crop as a population of individual plants.

Population Dynamics Of Brome Grass In Relation To Control Systems, A H. Cheam, Stephen Lee, C. M. Ralph, P Nelson

Experimental Summaries - Plant Research

Trial 86C1

Location: East Chapman Research Station.

To identify the level of control of brome grass under various crop rotation systems so that farmers can be advised on the degree of infestation likely to be encountered when using a particular system.
To design the best control system to reduce quickly the anticipated large seed population of brome grass in the soil.

General Comments And Comparative Yields, W Porter, S Carr

Experimental Summaries - Plant Research

General comments and comparative yields on all trials.
87ME77, 87ME78, 87ME79, 87ME80 and 87ME81, 87ME82, 87ME83, 87ME84, 87ME85, 8714E88

Genesis Of Marine Terrace Soils, Barbados, West Indies: Evidence From Mineralogy And Geochemistry, Daniel R. Muhs, Russell C. Crittenden, John N. Rosholt, Charles A. Bush, Kathleen C. Stewart

United States Geological Survey: Staff Publications

Well-developed, clay-rich soils dominated by interstratified kaolinite-smectite are found on the uplifted coral reef terraces on the island of Barbados. The reef limestone is unlikely to have been the soil parent material however, because it is 98 per cent CaCO, and geomorphic evidence argues against the 20 m of reef solution required to produce the soils by this process. The mineralogy of the sand, silt, and clay fractions of the soils, and trace element geochemistry, suggest that aeolian materials carried on the trade winds from Africa, volcanic ash from the island of St. Vincent, and quartz from Tertiary bedrock on …

Slack-Water Deposits And The Magnitude And Frequency Of Flash Floods, Eastern Kentucky, Russell G. Shepherd, Lisa K. Bienkowski

KWRRI Research Reports

The potential for predicting flood magnitude and frequency using sediments deposited in backwater areas during flash floods was investigated on the Cumberland Plateau of eastern Kentucky, a region n9torious for flash flooding. Slack-water deposits are abundant in the area at tributary mouths and bedrock channel expansions. They are identifiable on geologic quandrangle maps, and are locally good potential indicators of maximum flood-crest elevations. However, in this humid region, flash floods could not be distinguished from non-flash floods using slack-water sedimentology.

The results from the slack-water deposits studied indicate that they offer limited potential for predicting flash floods because 1) intense …

Cliff-Height And Slope-Angle Relationships In A Chronosequence Of Quaternary Marine Terraces, San Clemente Island, California, Russell Crittenden, Daniel R. Muhs

United States Geological Survey: Staff Publications

Zusammenfassung. Eine Abfolge quartarer Strandterrassen auf ~an Clemente Island, Kalifornien, liefert einen Rahmen fur die quantitative Analyse der Anderungen an vom Meer verlassenen Kustenkliffen als Funktion der Zeit. Es wurde eine Abschatzung der Anwendbarkeit von BUCKNAM & ANDERSON (1979) log-lin~arer Beziehung zwischen Wandhohe und Hangwinkel durchgefuhrt, indem Brandungskliffhohe und maximale Hangwinkel verwendet wurden. Die Ergebnisse zeigen eine regelhafte Zunahme des Hangwinkels mit dem Logarithmus der Kliffhohe, und Kliffe einer bestimmten Hohe zeigen m,it der Zeit eine Abnahmedes maximalen Hangwinkels. 1m ganzen waren die Relationen schwacher als fur FluBterrassen und Bruchstufen in unverfestigten Materialen, aber die Methode kann wahrscheinlich verwendet werden, …

Long-Term Effects Of Tillage On The Retention And Transport Of Soil Water, H. D. Scott, L. S. Wood, W. M. Miley

Arkansas Water Resources Center Technical Reports

Quantitative measurements were made of the physical and chemical properties of two virgin prairie soils, Crowley and Jay, that remain in their native Arkansas environments and of similar soils that had been tilled extensively. Comparisons were made of soil properties at several depths. When compared with the tilled soils the virgin soils had higher organic matter contents, saturated hydraulic conductivities and water retained at several applied pressures. Bulk densities and hydraulic resistances were lower in the virgin soils. For the Crowley silt loam, values of pH and elemental contents of the virgin soil were higher than those of the tilled …

Algal Growth Potentials And Heavy Metal Concentrations Of The Primary Streams To Upper Beaver Lake, Richard L. Meyer, W. Reed Green, Kenneth F. Steele, Diana Wickliff

Arkansas Water Resources Center Technical Reports

Meyer and Green (1984) demonstrated the probable inhibition of algal growth potential by heavy metals in upper Beaver Lake. Upper Beaver Lake receives water from three tributaries. One contains a small reservoir and the combined streams receive sewage input. Collections were made approximately monthly at eight sites for the Algal Assay Bottle Test (AABT) and heavy metal analysis. In general, AABT results indicated that the collections above the sewage lnput were phosphorus limited while those below were nitrogen or combined nitrogen and phosphorus limited. Growth inhibition occurred during summer and early fall at various sites with greater inhibition at the …

The Ecology Of Skeleton Weed (Chondrilla Juncea) In Western Australia. Survival And Fecundity Of Wild Radish (Raphanus Raphanistrum) Populations In Lupin Crops. Reproduction And Seed Persistence In Arum Lily (Zantedeschia Aethiopica)., F. D. Panetta

Experimental Summaries - Plant Research

After ripening and fates of field-stored skeleton weed seeds, 86BA11. Predation on seeds of skeleton weed, 86BA10. The effects of wetting/drying cycles upon the fates of skeleton weed seeds, 84PE42. Skeleton weed demographic studies, 84BA17. Radish control in lupins, 86N085. Seed production and seed persistence in Arum lily, 86PE56. Germination studies on fresh and stored seeds of Arum lily, 86PE57.

The Ecology Of Skeleton Weed In Western Australia, Afghan Thistle Ecology, Biology Of Gorteria Personata., J. Dodd

Experimental Summaries - Plant Research

The ecology of skeleton weed in Western Australia, 84BA17. Afghan thistle ecology, 84N050. Regenerative ability of stem and root segments, 85PE51. Biology of Gorteria personata, 86M03, 86N08. Life cycle, 86M03, 86N08. Germination requirements, 86PE7.

Weed Seed Ecology., A. H. Cheam

Experimental Summaries - Plant Research

Population dynamics of Brome grass in relation to control systems, 86C1. Wild radish control in lupins, 86N085. Preplanting operations to stimulate Doublegee emergence, 85C89. Postplanting operations to stimulate Doublegee emergence, 85C90.

Capeweed Control In Cereals., J. R. Peirce, B. J. Rayner

Experimental Summaries - Plant Research

Capeweed control in cereals pre-sowing control, 86WH58. Capeweed control in cereals post-emergence control, 86WH59. Capeweed control in cereals post-emergence control with Reglone®, 86WH69. Capeweed control in cereals post-emergence control with various products, 86WH70. Capeweed control in cereals post-emergence control with mixtures, 86WH74. Lovegrass (Eragrostis curvula) control along roadsides, 86WH75. Chemical control of Four o'Clock (Oxalis purpurea) in cereals, 86N0110. Hoegrass, different rates with oils or wetting agent for wild oat control in cereals, 86N0118. Chemicals x depth of blade plowing to control couch, 86N010. Chemical x cultural control of couch (long-term), 85N092. Chemical control of couch prior to cereal establishment, …

Effectiveness Of Various Herbicides On Hoegrass Resistant Wild Oats. Effect Of Herbicides On Hoegrass Resistant Annual Ryegrass. Growth Of Cereals Planted In Simazine Treated Soil. Growth Of Wheat One Year After Simazine. Glean Use On Drier Alkaline Soils., T. Piper

Experimental Summaries - Plant Research

86N0113, 86N0114, 86N0115, 86N0116, 86N0102, 86N0103, 86N0103, 86N0104, 86N0105, 85WH54, 85ME56, 85N27, 86WH51, 86N34, 85N30, 86WH52, 86N33, 86WH53, 86SG25,

1. Cereal Agronomy, 2. Pesticides, J. H. Moore, G. R. Dean

Experimental Summaries - Plant Research

Best bet minimum tillage, 86AL38, 86AL39, 86AL40. Minimum tillage factors, 86AL62. South coast potential yield factors, 86 AL 81, 86AL82. Time of planting by variety interaction - south coast, 86AL87. Capeweed control in cereals with residual herbicides, 86AL45. Sprayseed/glean, roundup/glean tank mixes for grass control, 86AL43. Sorrel control systems, 86AL43. Sorrel control for pasture establishment. Pre plant ally on barley, 86AL86. Pre plant ally on oats, 86AL84, 86AL85. Pre plant ally on clover, 86AL63. Pre plant ally on peas, 86AL65. Pre plant ally on rape, 86AL67. Double knockdowns, 86AL68, 86MT67. Rate, time of spraying and scarifying interaction on pre-p1ant herbicides, …

Foliar Wheat Diseases And Cereal Smuts., R. Loughman, A. E. Twigg

Experimental Summaries - Plant Research

Chemical control of leaf spots of wheat, 86BA41, 86MT49. Semi-natural inoculum for plant breeders plots, 86MD2. Chemical control of soil-borne flag smut, 86ME73, 86M032. Chemical control of barley loose smut, 86AL50, 86KA59, 86MT47. Chemical control of loose smut in barley with different levels of seed infections, 86MT48. Disease characterisation of cereal variety trial stage 4 sites.

Fungicide Testing, M. J. Barbetti

Experimental Summaries - Plant Research

Fungicidal control of Phoma blackstem disease in medic, 86 KA 11. Medic cultivar susceptibility to Phoma blackstem disease, 85 KA 56. Role of Phoma seed infection in medic, 85 KA 57. Effect of soil pasteurization on damage caused by six fungal root pathogens, 86 PE 53. Susceptibility of 18 sub-clover cultivars to isolates of the clover scorch fungus, Kabatiella caulivora, 86 PE 54. Effect of plant age or growth stage of subterranean clover on susceptibility to infection by the clover scorch fungus, Kabatiella caulivora, 86 PE 55. Susceptibility of rapeseed lines to blackleg crown canker, 86 MT 1, 86 MT …

Radish Control In Lupins, Weed Control In Lupins, Peas - Broadleaf Weed Control, Peas - Post Emergence Grass Control, Grapevines - Herbicide And Fruit Quality., D. J. Gilbey, R. Klemm

Experimental Summaries - Plant Research

Radish control in lupins simazine "top up", 86N085. Radish control in lupins diflufenican, 86 GE 42, 86 MO 33, 86 ME 83. Radish control in lupins probe, 86 TS 33, 86 GE 41. Radish control in lupins simazine and atrazine, 86 GE 43, 86 MO 34, 86 NO 87, 86 LG 41. Capeweed control in lupins simazine and atrazine, 86 LG 41. Radish control in lupins, 86 TS 38. Radish control in lupins post emergence herbicides, 86 WH 68. Radish control in lupins post emergence herbicides, 86 MO 42. Radish control in lupins post emergence duiron and 2,4-db, 86 GE …

The Physics Of The Antarctic Circumpolar Current, Worth D. Nowlin, John M. Klinck

CCPO Publications

A region of transition of surface water characteristics from subantarctic to Antarctic and an associated eastward flowing Antarctic Circumpolar Current (ACC) have long been recognized to exist as a band around Antarctica. In this review we summarize the most important observational and theoretical findings of the past decade regarding the ACC, identify gaps in our knowledge, and recommend studies to address these. The nature of the meridional zonation of the ACC is only now being revealed. The ACC seems to exist as multiple narrow jets imbedded in, or associated with, density fronts (the Subantarctic and Polar fronts) which appear to …

Deep Flow Variability In Central Drake Passage, John M. Klinck, Eileen E. Hofmann

CCPO Publications

A rotary empirical orthogonal function analysis of the currents measured in central Drake Passage during DRAKE 79 shows that the deep (2500 m) flow has the same spatial and temporal structure as the flow at 500 m, suggesting that current variability in this region penetrates to the bottom. However, comparison of the time amplitude of the corresponding modes indicates that the variability of the 2500 m flow resulting from north to south shifts in the location of the Polar Front lags that at 500 m by one to three days. This implies that the Polar Front slopes to the east …

Reconnaissance Bathymetry Of Basins Occupied By Pleistocene Lake Lahontan, Nevada And California, Larry Benson, M. D. Mifflin

United States Geological Survey: Staff Publications

Beginning about 12,500 years B.P., Lake Lahontan began to decline (fig. 1: Black Rock Desert data from Davis [1983]; Truckee River Delta data from Born [1972]; tufa data from Benson [1981]; packrat-midden data from Thompson and others [1985]) . As water levels declined, their altitudes fell below sill altitudes (table 1); locations of these sills are shown in figure 2. Today, five surface-water bodies (Black Rock Playa, Humboldt-Carson Sink, Walker Lake, Pyramid Lake, Honey Lake) exist in four of the seven subbasins (fig. 2).

The collective surface area of the modern lakes today (1985) totals less than 1,600 km2 . …

Seismic Modelling And Paleoceanography At Dsdp Site 574, Larry A. Mayer, Tom H. Shipley, Fritz Theyer, Roy H. Wilkens, Edward L. Winterer

Affiliate Scholarship

The analysis of high-resolution watergun seismic profiles collected in support of DSDP Leg 85 drilling reveals sev eral major, regionally traceable reflectors that can be correlated over more than 360,000 km2 in the central equatorial Pacific. Synthetic seismograms generated from shipboard physical property measurements (carefully corrected to in situ values) for DSDP Site 574 show excellent agreement with the field records; the agreement suggests that the traveltime to-depth conversion is accurate and permits the precise (± 5 m) location of reflectors in the cored section. The reflectors can be dated (±0.5 Ma) as follows: Orange, 21.5 to 22.5 Ma; Yellow, …

Leachate Monitoring In Naturally Saline Groundwater Chesapeake Landfill Chesapeake Virginia, T. Britt Mcmillan

OES Theses and Dissertations

Groundwater chemistry around the Chesapeake municipal landfill was monitored over a one year period. Ten sample sites as well as two surface water sites were used to monitor water quality. Two wells, one at 3 m and the other at 10 m were located at each site. Surface water samples were taken from the Elizabeth River, north of the landfill, and a tidal channel, west of the landfill. Seven groundwater sites were downgradient of the landfill and three sites were upgradient (control sites).

The landfill overlies a tidal marsh, approximately 100 m south of the intracoastal waterway (Elizabeth River). Dredge …

Foraminiferal Paleoenvironments Of The Eastover Formation (Upper Miocene Virginia), Joann H. Goshorn

OES Theses and Dissertations

Sixty-two taxa representing 29 genera from 39 foraminiferal sample pairs have been documented and analyzed in a paleoenvironmental study of the Eastover Formation in southeastern Virginia. The Eastover Formation consists of a lower Claremont Manor Member, a silt fine-grained sand and an upper Cobham Bay Member, a shelly fine grained sand. Planktonic specimens were rare and indicated a late Miocene to early Pliocene age for the Eastover Formation. Benthics were used to interpret paleoenvironments by comparison with data from the distribution of Recent foraminifera, species diversity, planktonic to benthic ratios, and sediment analyses. The foraminifera indicate that the Eastover Formation …