Digital Commons Network^™

Herbicide Residues, T Piper

Experimental Summaries - Plant Research

Pea growth following Sulphonyl urea herbicide, 88SG28, 88SG29. Medic regeneration following Sulphonyl urea herbicide, 88SG30, 88SG31, 88LG68, 88LG69, 88LG70.

Weed Control In Lupins With Simazine Topping Up, D J. Gilbey, R Klemm, B Roberts

Experimental Summaries - Plant Research

Weed control in Lupins with simazine “topping up”, 89GE62, 89TS40, 89NO59. Doublegee control in Lupins with Brodal plus simazine, 89GE63, 89TS41, 89NO60. Post emergence doublegee control in lupins, 89NO92, 89MO65. Doublegee control in peas, pre-emergence, 89TS47, 89MO38, 89M38, 89NO63. Doublegee control in peas, post-emergence, 89TS48, 89MO39, 89ME87, 89NO64.

Analysis Of Hydrogeologic Sensitivity In Winona County, Minnesota, Michael D. Trojan, James A. Perry

Journal of the Minnesota Academy of Science

Hydrogeologic sensitivity to contamination throughout Winona County in southeastern Minnesota was assessed using the recently developed Trojan-Perry rating method. Sensitivity varied across and within three analysis regions. The Prairie du Chien Aquifer, comprising Region I, showed a wide range of sensitivity, varying from moderate to extreme. Areas of greatest sensitivity were sites where the aquifer was unconfined and overlain by a thin layer of unconsolidated material and karst bedrock. Under these conditions water may rapidly infiltrate through the soil zone and highly dissolved bedrock and into underlying aquifers. The Ironton-Galesville Aquifer, comprising Region II, was protected from surface infiltration by …

Geographic Information Systems, Data, And Water Resources, Dwight A. Brown, Philip J. Gersmehl

Journal of the Minnesota Academy of Science

ABSTRACT-We evaluate three data handling methods for use in a GIS analysis of land-cover change impacts on runoff. A universe of 2560 point samples is analyzed to provide runoff calculations that would se1:7e _as a comparison base to evaluate different attribute logic systems. The attribute logics ~e evaluate are two va~1at1ons of tag and one of count. We chose a two by five mile area of Dakota County, Mmnesota as the test site, and prepared raster GIS maps of soil hydrologic groups and two plausible land covers. The count 1:1~thod for handling the generalization of data produced results that were …

Water Quality In Southeastern Minnesota Streams: Observations Along A Gradient Of Land Use And Geology, Nels H. Troelstrup Jr., James A. Perry

Journal of the Minnesota Academy of Science

ABSTRACT-Surface water quality in southeastern Minnesota's driftless area exhibits subregional and local spatial patterns which are highly correlated with subsurface geology and land-use practices. Some variables appear to respond on subregional or watershed scales. Nitrate, specific conductance, alkalinity, and surface water atrazine concentrations were lower in streams originating from the Prairie Du Chien or Jordan sandstone ~quifers of easte:n Fillmore and Houston Counties than those originating from the Galena limestone aquifer m west-central Fillmore County. In addition, the numbers of pollution intolerant and functionally specialized invertebrates in the benthic community were higher in the eastern streams. Gross primary production on …

Origin And Developmental History Of Minnesota Lakes, H. E. Wright Jr.

Journal of the Minnesota Academy of Science

ABSTRACT-Most lakes in Minnesota owe their origin directly or indirectly to glacial deposition or erosion 10,000 to 20,000 years ago. The lakes' shapes have since been modified by waves and currents near the shores and by the deposition of sediment off-shore-principally the sediment produced by growth of algae and other organisms. This sediment is a receptacle for pollen grains blown into the lake from the surrounding vegetation, and the stratigraphic succession of pollen grains records the postglacial vegetational and thus climatic history of the area. The sediment also preserves the fossils of microorganisms that reveal by their chemical composition the …

Nitrogen Management Related To Groundwater Quality In Minnesota, James L. Anderson, Gary L. Malzer, Gyles W. Randall, George W. Rehm

Journal of the Minnesota Academy of Science

ABSTRACT-Minnesota ranks fifth in overall fertilizer nitrogen (FN) use. Nitrogen is essential for crop production; however, there are concerns about this use relative to profitability and potential impacts on groundwater. There are many sources and sinks of nitrogen in ecosystems. The impact of agricultural management practices on groundwater requires that all sources and fates be considered before FN rates are determined. Research is underway to evaluate relationships between FN application for continuous com and movement of nitrate through soil profiles. Growers making N management decisions have to be able to evaluate the complex nature of N in the environment when …

Natural And Anthropogenic Forces Acting On A Forest Lake, M. C. Whiteside, M. B. King, K. Pulling

Journal of the Minnesota Academy of Science

ABS1RACT-Lak~ Itasca, Minnes~ta is located within one of the more popular state parks. Since the turn of the centmy, loggmg, fire protection, and development within the watershed have put modest pressures on the ecosystem. The presence of the University of Minnesota's Biological and Forestry Station on the lake has encouraged research in this region. Consequently there are numerous research reports and papers which are available _at the station's library. We examined data collected over the past 25 years to see if we could detect changes ~~ the lake. We detected no changes in phytoplankton, macrophyte, zooplankton, or zoobenthos com~urnues, but …

The Water Quality And Management Of Lakes In The Twin Cities Metropolitan Area, Richard A. Osgood, Gary L. Oberts

Journal of the Minnesota Academy of Science

ABSTRACT-We have detected a slow degradation in the water quality of Twin Cities Metropolitan Area lakes du~ to phospho_rus enrichment. While the water quality of the lakes does not appear to limit most uses, nmsances do exist. We have further discovered that commonly-used watershed treatments such as wetland diversions and ponding, are ineffective ~t reversing or completely mitigating the degradati~n following land development. Th_erefore, we are su~gestmg that lake managers reduce the external loading of phosphorus to the greatest ~oss_1ble extent; then, 1f further water quality improvements are necessary, that measures which treat eutroph1cat1on-related symptoms be considered for the long-term …

Viruses And Drug Resistant Bacteria In Groundwater Of Southeastern Minnesota, Sagar M. Goyal, Daniel Amundson, Robert A. Robinson, Charles P. Gerba

Journal of the Minnesota Academy of Science

ABSTRACT-Karst topography of soils in southeastern Minnesota is responsible for the formation of sinkholes, subsurface cracks, and underground rivers which may enhance the transportation of surface contaminants into groundwater. The present study was conducted to determine the presence of human pathogenic viruses, coliforms, fecal coliforms and coliphages in private rural wells of this area. The occurrence of drug resistance in bacteria isolated from groundwater also was studied. Coliform bacteria were detected at least once from 22 of the 26 sites sampled over 34 months. Water from 10 sites yielded drug-resistant indicator bacteria; 25 of 38 (65.8 percent) total coliforms and …

Susceptibility Of Northern Minnesota Lakes To Acid Deposition Impacts, Clifford J. Twaroski, J. David Thornton, Rick L. Strassman, Patrick L. Brezonik

Journal of the Minnesota Academy of Science

ABSTRACT-lake chemistry surveys indicate a large number of lakes with acid neutralizing capability (ANC) below 200 μeq/L occur in northeast Minnesota where shallow soils over bedrock and exposed rock outcrops predominate, and in moraine areas having rolling to steep topography in north-central and east-central Minnesota. In the Boundary Waters area, lake chemistry is strongly associated with bedrock geology. lakes with ANC <100 μeq/L are associated with granite, basalt, and gabbro formations, while lakes with ANC of 100- 200 μeq/L are associated with slate and greenstone formations. In the rest of the state where soils are deep, landform, soil type, and lake hydrology determine lake chemistry. Most low ANC lakes are found in terminal moraine areas. These lakes are generally small ( <40 ha in area), have limited groundwater inflow, and typically classed as precipitation-dominated seepage lakes. Higher ANC lakes (>400 μeq/L) are often associated with agricultural and residential land uses. Relationships found between ANC and bedrock geology, and between ANC and landform and soils, provided the basis for mapping the distribution of low ANC surface waters in Minnesota. …

The Regional Nature Of Lake Water Quality Across Minnesota: An Analysis For Improving Resource Management, Steven A. Heiskary, C. Bruce Wilson

Journal of the Minnesota Academy of Science

ABSTRACT-The diversity and number of lakes in Minnesota may be better understood by the use of regional characterizations of lake and watershed information. Recent efforts have utilized the ecoregion approach to define seven regions across Minnesota, four of which contain 98 percent of our lake resources. Typical land use patterns vary regionally as do lake water quality patterns. Understanding these patterns will assist lake managers to develop realistic goals and minimize false expectations. Regional assessments facilitate the definition of reasonable goals, expressed in terms of: average summer nutrient concentrations, probability of nuisance conditions ( e.g., estimates of algal bloom frequency), …

County-Based Priority Assessment Methodology For Phasing Of Wellhead Protection Programs, H. O. Pfannkuch, M. E. Campion, D. C. Mccaa, J. M. Palenberg

Journal of the Minnesota Academy of Science

ABSTRACT-Setting priorities to schedule and implement wellhead protection programs for municipal and community drinking water supplies is presented in the framework of a general risk assessment approach. This includes a hazard identification procedure representing the likelihood of contaminants being released to the surface environment, a hydrogeologic vulnerability assessment representing the risk of contaminants entering the groundwater supply, and an impact assessment, strongly linked to the population at risk. A methodology was developed to aggregate information on a county basis for Minnesota. The resulting composite risk index map shows a number of counties in the central part of the state roughly …

Factors Affecting Water-Supply Potential Of The Twin Cities Metropolitan Area Aquifer System, Michael E. Schoenberg

Journal of the Minnesota Academy of Science

ABSTRACT-The Twin Cities aquifer system in Minnesota contains five aquife~s and fou: confining units that together consist of fourteen geologic units. Unconsolidated sand and gravel aqmfers overlie bedrock sandstone and carbonate aquifers. Between 1880 and 1980, groundwater wi_thdrawals have c_aused long-term wate~ level declines of as much as 90 feet in the Prairie du Chien-Jordan aquifer and 240 feet m the deeper Mount S~monHinckley aquifer-the two major sources of groundwater supplies in the ar~a .. The estimated max1mu1:1 continuous withdrawal rate from the aquifer system is about 650 Mgal/d (million gallons per day). This compares with an average daily groundwater …

A Hydrologic Model For Minnesota Peatlands, Kenneth N. Brooks, Dawn R. Kreft

Journal of the Minnesota Academy of Science

ABSTRACT-The Peatland Hydrologic Impact Model (PHIM) is a continuous simulation computer model developed over a twelve-year period to aid hydrologists in understanding the hydrologic functions of peatlands and upland-peatland watersheds. An initial conceptual model defined the research needed to create the working m?del. The re~e_arch has become an iterative process of model design, field work, model refinement, ~ode! test1?g, an~ add1t1?nal field work. The model is as physically-based as possible while relying on data mput that 1s readily available to the natural resources community. It simulates streamflow response of peatlands, upland-peatland systems, mined peatlands, and a combination of these watershed …

The Legislative Commission On Minnesota Resources Involvement In Water Resource Programs, John Velin, George Orning

Journal of the Minnesota Academy of Science

ABSTRACT :--The Legislative Commission on Minnesota Resources (LCMR) has funded over $32 million worth of projects m three water-related areas since 1963. The authors describe the process the Commission uses to allocate money and summarize the general nature and accomplishments of many of the water projects.

Geology Of The Pre-Dune Strata, James B. Swinehart, Robert F. Diffendal Jr.

School of Natural Resources: Faculty Publications

Over the last 98 million years, four general geological processes have acted to shape the ancient landscapes buried beneath the Sand Hills. Three of these affected the area directly, either depositing sediments on the land surface or eroding it, while a fourth took place west of Nebraska, but affected the region nonetheless.

Shells of clams, oysters, and numerous other kinds of creatures similar to forms that live today in the seas are preserved as fossils in the chalks, limestones, and shales that form the oldest rocks beneath the Sand Hills that will be described. These deposits indicate to geologists that …

Late Pennsylvanian And Early Permian Cyclic Sedimentation, Paleogeography, Paleoecology, And Biostratigraphy In Kansas And Nebraska, Roger K. Pabian, Robert F. Diffendal, Jr. Jr.

Robert F. Diffendal, Jr., Publications

Overview of Upper Pennsylvanian Cyclic Sedimentation in Kansas and Nebraska, Philip H. Heckel, Department of Geology, University of Iowa, Iowa City, Iowa

With contributions from:

Christopher G. Maples and W. Lynn Watney, Kansas Geological Survey, Lawrence, Kansas

John Harris, Shell Western Exploration and Production, Inc., Houston, Texas

David Ball, Champlin Petroleum Company, Houston, Texas

Philip H. Heckel, University of Iowa, Iowa City, Iowa

R. R. West, V. Voegeli, S. Roth, K. Leonard, H. R. Feldman, and C. Cunningham, Kansas State University, Manhattan, Kansas

Royal H. Mapes, Ohio University, Athens, Ohio

Hans-Peter Schultze, University of Kansas, Lawrence, Kansas

R. Matt Joeckel, …

Lake Maloney Quadrangle, Nebraska--Lincoln County, 7.5 Minute Series (Topographic), Robert F. Diffendal Jr.

Robert F. Diffendal, Jr., Publications

7.5 minute series (topographic)

100° 45' to 100° 52' 30"

41° 00' to 41° 07' 30"

Includes Ogallala Outcrops (pencil)

Pisces Iv Submersible Observations In The Epicentral Region Of The 1929 Grand Banks Earthquake, John E. Hughes Clarke, Larry A. Mayer, David J.W. Piper, Alexander N. Shor

Affiliate Scholarship

The PISCES IVsubmersible was used to investigate the upper continental slope around 44 ON, 56" W, near the epicentre of the 1929 Grand Banks earthquake. Four dives in water depths of 800-2000 m were undertaken to observe speci3c features identijied with the SeaMARC I sidescan system in 1983. Two dives were made in the head of Eastern Valley where pebbly mudstones ofprobable Pleistocene age were recognized outcropping on the seafloor. Constructional features of cobbles and boulders, derived by exhumation and reworking of the pebbly mudstone, were also observed. These include gravel/sand bedforms (transverse waves) on the valley floor. Slope failure …

Rock Phosphates Are Poor Fertilizers For Non-Leaching Soils In South-Western Australia, Michael D A Bolland, Bob Gilkes

Journal of the Department of Agriculture, Western Australia, Series 4

Field experiments conducted on our non leachng soils from 1975 to 1988 have consistently shown that rock phosphates, compared with freshly applied superphosphate each year, are a relatively ineffective fertilizer in the year of application and in the years after application.

Review Of The Wisalts Bank Installations, C J. Henschke

Resource management technical reports

No abstract provided.

Assessment Of Management Strategies For Reducing Land Degradation Problems In The East Perenjori Catchment, C J. Henschke, K J. Bligh, R Ferdowsian

Resource management technical reports

No abstract provided.

Minimal Soil Disturbance Sowing In New South Wales And Its Relevance To Reducing Water Erosion In Western Australia, K J. Bligh

Resource management technical reports

During a study tour in New South Wales both inexpensive modifications to existing seeders and state of the art new mechanisms were investigated. Narrow-winged points can readily be fitted to existing tined seeders to immediately reduce water erosion in Western Australia. Press wheels may improve crop establishment, particularly with early sowing in this predominantly winter-rainfall region.

Soil-Plant-Sheep Organochlorine Pesticide Research, Tony Albertsen

Experimental Summaries - Plant Research

1. Soil O/C decay (5812)

Locations: Brookhampton, Carbunup, Dardanup, Denmark, Donnybrook, Goodwood, Jindong, Kirrup, Manjimup, Pemberton, Redmond.

To determine the rate of decay of soil Dieldrin.

2. Soil profile distribution of O/Cs (5812) (88AL21/1)

To determine the distribution of O/cs at 1 cm intervals down the soil profile.

3. Soil decontamination of O/Cs (5812)

To assess practical and economic techniques for decontaminating soil Dieldrin residues.

4. The accumulation and rundown of Dieldrin in wethers. (5841)

To determine the relationship between the levels of Dieldrin contamination in soil, pasture, sheep body and wool fat.

5. Surface drainage trial 86V1/5164

Efficient surface …

Medic Variety Evaluation., C. K. Revell

Experimental Summaries - Plant Research

Trial 89M57

Medic variety evaluation - rows.
Merredin Research Station (Paddock T5)

Trial 89ME71

Selection of early maturing M. murex.
Nokaning.

Trial 88ME86

Evaluation of Santiago in low rainfall areas.
Mukinbudin.

Trial 87M73

Medic variety evaluation - large plots.
Merredin Research Station.

Trial 86M65

M. polymorpha variety evaluation - large plots.
Merredin Research Station.

Trial 88ME84

Evaluation of burr medics on Morrel soils.
Nokaning.

Trial 88SC30

Selection of early maturing M. murex.
Merredin.

Lithostratigraphy, Biostratigraphy, And Stable-Isotope Stratigraphy Of Cores From Odp Leg 105 Site Surveys, Labrador Sea And Baffin Bay, D. B. Scott, P. J. Mudie, A. De Vernal, C. Hillaire-Marcel, V. Baki, K. D. Mackinnon, F. S. Medioli, Larry A. Mayer

Affiliate Scholarship

Trigger weight (TWC) and piston (PC) cores obtained from surveys of the three sites drilled during Ocean Drilling Program (ODP) Leg 105 were studied in detail for benthic foraminiferal assemblages, total carbonate (all sites), planktonic foraminiferal abundances (Sites 645 and 647), and stable isotopes (Sites 646 and 647). These high-resolution data provide the link between modern environmental conditions represented by the sediment in the TWC and the uppermost cores of the ODP holes. This link provides essential control data for interpretating late Pleistocene paleoceanographic records from these core holes. At Site 645 in Baffin Bay, local correlation is difficult because …

The Influence Of Biogenic Silica On Seismic Lithostratigraphy At Odp Sites 642 And 643, Eastern Norwegian Sea, Peter Hempel, Larry A. Mayer, Elliot Taylor, Gerhard Bohrmann, Alan Pittenger

Affiliate Scholarship

Drilling at ODP Sites 642 and 643 revealed a 250 m-thick section of diatomaceous Pliocene to Miocene sediments on the outer Vdring Plateau, eastern Norwegian Sea. These biogenic silica-rich sediments have a significantly lower saturated bulk density than the surrounding sediments, causing a decrease in acoustic impedance, which is seismically expressed as a negative polarity reflection. Variations in sonic velocity, the other key parameter in seismic analysis, is only of secondary importance in creating impedance contrasts in our study. Synthetic seismograms were produced from shipboard physical property measurements corrected for in situ conditions. These synthetic seismograms are in good agreement …

Assessment Of Land Capability For On-Site Septic Tank Effluent Disposal, M R. Wells

Resource management technical reports

No abstract provided.

Small Farmland Experimental Catchments In Western Australia, K J. Bligh

Resource management technical reports

No abstract provided.