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Phosphorus Transport From A Field Receiving Long-Term Liquid Dairy Manure Application In A Karst Landscape, Dustin Cody Graham
Phosphorus Transport From A Field Receiving Long-Term Liquid Dairy Manure Application In A Karst Landscape, Dustin Cody Graham
Masters Theses
Agricultural runoff is a leading non-point source contributor to water quality impairment in the United States and is associated with eutrophication of surface waters. Phosphorus (P) is often the most limiting nutrient for eutrophication in freshwaters. The objectives of this study were to characterize the P forms in surface runoff from an agricultural field that has received long-term applications of liquid dairy manure and to determine the forms of soil P that occur within a sinkhole feature located within the application field. Three 21-m x 6 m bermed plots were established to collect storm water runoff from a portion of …
Elemental Analysis Of Soils Using Laser-Induced Breakdown Spectroscopy (Libs), Ningfang Yang
Elemental Analysis Of Soils Using Laser-Induced Breakdown Spectroscopy (Libs), Ningfang Yang
Masters Theses
Laser-induced breakdown spectroscopy (LIBS) has been applied for the quantitative analysis of various samples, but it is controversial for chemically-complex soils. In order to study the effect of delay time, gate width, and repetition rate on the LIBS signal in soil, the emission line at 396.84 nanometer was selected. The results indicated that repetition rate, delay time, and gate width significantly affected the LIBS signal, delay time was more important than gate width in controlling the LIBS signal. The optimum instrumental parameters for soil analysis were obtained when repetition rate, delay time, and gate width equaled 10 hertz, 1 microsecond, …