Browsing by Subject "Potassium"

Now showing 1 - 5 of 5
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    Environmental Impacts of Potassium Acetate as a Road Salt Alternative (University of Minnesota evaluation)
    (Minnesota Department of Transportation, 2022-07) Gulliver, John S.; Chun, Chan Lan; Weiss, Peter T.; Erickson, Andrew J.; Herb, William; Henneck, Jerry; Cassidy, Kathryn
    Road salt (NaCl) is used predominantly across the state for winter road anti-icing (as brine) and de-icing (as a solid) operations. Road salt is used because it is inexpensive and effective, but the thousands of tons used annually have resulted in increasing chloride concentrations of surface water bodies throughout Minnesota. In many cases, chloride concentrations are above regulatory limits, which results in the loss of aquatic biota and the water body being labeled as impaired. Thus, there is a need for one or more road salt alternatives (RSAs) that are effective, relatively inexpensive, and environmentally friendly. This report investigates the environmental impacts of potassium acetate (Kac), which is effective at lower temperatures than most other potential RSAs and is also less corrosive to steel than conventional road salt. Field measurements indicate that current applications of KAc do not have a substantial influence on biochemical oxygen demand (BOD) and microbiological water quality in Lake Superior. However, KAc concentrations due to application to 25% of the roads in the Miller Creek watershed are predicted to be above the toxic limit for water fleas. We believe that KAc could be used in the most precarious winter driving safety locations, but not over all watershed roads or for all storms. Acetate could be used as a general organic anti-icer, but in combination with another cation, such as sodium or magnesium.
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    Preventing High Blood Pressure in African American Populations
    (2009-09-18) Berry, Brent
    Hypertension (or high blood pressure) is a problem for many Americans with higher prevalence among African Americans. There are simple steps before advising the use of medications to take to ensure this problem does not lead to long-term systemic effects such as stroke, heart failure, and/or kidney disease.
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    Preventing High Blood Pressure in African American Populations
    (2010-07-21) Berry, Brent
    Hypertension (or high blood pressure) is a problem for many Americans with higher prevalence among African Americans. There are simple steps before advising the use of medications to take to ensure this problem does not lead to long-term systemic effects such as stroke, heart failure, and/or kidney disease.
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    R Code, Data, and Output Supporting: Nutrient Data from U.S. Manure Systems
    (2024-06-27) Bohl Bormann, Nancy; Wilson, Melissa; Cortus, Erin; Silverstein, Kevin; Janni, Kevin; Gunderson, Larry; nancy.bohl.bormann@gmail.com; Bohl Bormann, Nancy
    This repository contains R code, processed data, and associated outputs supporting the results reported in: Bohl Bormann, 2024. Manure Nutrient Data Compilation and Analysis for Agronomic and Environmental Applications. PhD Dissertation.
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    Split application of sulfur and potassium and their leaching potential for corn grown on irrigated soils
    (2013-09) Bonde, Andria Jansen
    Irrigated coarse textured soils have the potential to produce high yielding crops but are also likely to leach out fertilizer nutrients before they can be utilized. Few studies have considered split fertilizer applications of sulfur (S) and potassium (K) on coarse textured soils. Eight fertilizer studies, four S and four K, were conducted to assess how split applications of S and K fertilizers affect plant uptake, corn grain yield, and the leaching potential over the growing season. Each site had four at planting (AP) and four in-season (IS) fertilizer rates applied for a combination of 16 different fertilizer treatments. Various plant tissue, remote sensing readings, and soil samples were taken to assess nutrient availability and movement through the soil profile. Suction cup lysimeters were used in select treatments to monitor soil pore water concentrations. Single or split applications of S and K fertilizers did not increase grain yield. Significant differences among different AP and IS rates were found for early plant and ear leaf S and K concentrations, but these were unable to predict grain yield. Normalized difference vegetation index or SPAD chlorophyll readers did not prove to be indicators of final corn grain yield in either S or K studies. Plant NDVI data was able to predict biomass in K studies. Lysimeter data from S studies suggest increased S concentration towards the end of the growing season but provided no advantage of split application of S fertilizer to avoid S losses. Lysimeter data suggested early season K movement and in most sites and IS fertilizer application had the greatest effect on end of the growing season pore water K concentration. Because of potential early K movement, split applications may be advised for farmers growing corn on coarse textured soils to avoid K losses.