A5073584573- Soil and Water Nutrient Dynamics
- Phosphorus and nutrient management
- Constructed Wetlands for Wastewater Treatment
- Soil erosion and sediment transport
- Hydrology and Watershed Management Studies
- Soil Carbon and Nitrogen Dynamics
- Wastewater Treatment and Nitrogen Removal
- Soil and Unsaturated Flow
- Aquatic Ecosystems and Phytoplankton Dynamics
- Groundwater flow and contamination studies
- Plant nutrient uptake and metabolism
- Hydrology and Sediment Transport Processes
- Clay minerals and soil interactions
- Plant Micronutrient Interactions and Effects
- Water Quality and Resources Studies
- Landfill Environmental Impact Studies
- Groundwater and Isotope Geochemistry
- Seedling growth and survival studies
- Urban Stormwater Management Solutions
- Pesticide and Herbicide Environmental Studies
- Soil Management and Crop Yield
- Crop Yield and Soil Fertility
- Aluminum toxicity and tolerance in plants and animals
- biodegradable polymer synthesis and properties
- Geophysical Methods and Applications
National Soil Erosion Research Laboratory
2017-2025
Agricultural Research Service
2005-2025
United States Department of Agriculture
2006-2024
Purdue University West Lafayette
2023
Indiana University Fort Wayne
2023
Grassland, Soil and Water Research Laboratory
2023
Fort Keogh Livestock and Range Research Laboratory
2023
Oklahoma State University
2006-2016
Oklahoma State University Oklahoma City
2006-2014
Waters (United States)
2006
Although N fertilizers are not acidic, their inputs to soil acid forming. As a result of the long-term use fertilizers, soils in Great Plains becoming more acidic and this acidity may become yield-limiting factor. In 1970, plots were initiated compare sources (anhydrous NH3, NH4NO3, urea, S-coated urea), application rates (34, 68, 136, 272 kg ha−1), an untreated check (0 N) on wheat (Triticum aestivum L.) grain yield, pH, exchangeable base cations, Al saturation. For properties evaluated,...
The U.S. Environmental Protection Agency (USEPA) has restricted concentrated animal feeding operation (CAFO) release of waste products into waters. These must be disposed using best management practices. Most the is spread on cropland, but some operations have found other creative uses for products. Use a phosphorus (P) reduction system to remove P from wastewater results in magnesium ammonium phosphate (MAP), slowly soluble fertilizer. Using will not eliminate need land application manure...
Plastic film mulching and urea nitrogen fertilization are widely used in agricultural ecosystems, but both their long-term use may leave a negative legacy on crop growth, due to deleterious effects of plastic microplastic accumulation acidification soil, respectively. Here, we stopped covering soil with an experimental site that was previously covered for 33 years compared properties subsequent maize growth yield between plots were never the film. Soil moisture about 5–16% higher at mulched...
For phosphorus (P) transport from upland areas to surface water systems, the primary mechanism is typically considered be runoff with subsurface assumed negligible. However, certain local conditions can lead an environment where may significant. The objective of this research was determine potential P along streams characterized by cherty or gravel subsoils, especially impact preferential flow paths on transport. At a field site Barren Fork Creek in northeastern Oklahoma, trench installed...
Pairing denitrifying woodchip bioreactors and phosphorus-sorbing filters provides a unique, engineered approach for dual nutrient removal from waters impaired with both nitrogen (N) phosphorus (P). This column study aimed to test placement of two P-filter media (acid mine drainage treatment residuals steel slag) relative system maximize N P minimize pollution swapping under varying flow conditions (i.e., hydraulic retention times (HRTs) 7.2, 18, 51 h; HRTs 7.6-59 min). Woodchip...
Continuous addition of municipal biosolids to soils based on plant nitrogen (N) requirements can cause buildup soil phosphorus (P) in excess crop requirements; runoff from these potentially contribute nonpoint P pollution surface waters. However, because are often produced using lime and/or metal salts, the potential for losses vary with wastewater treatment (WWTP) process. This study was conducted determine effect process forms and amounts biosolids, biosolids-amended soils, soils. We...
Phosphorus (P) losses to surface waters can result in eutrophication. Some industrial by-products have a strong affinity for dissolved P and may be useful reducing nonpoint pollution with landscape-scale runoff filters. Although appreciable research has been conducted on characterizing sorption by via batch isotherms, less data are available these materials flow-through context integral landscape filter. The objectives of this study were evaluate several setting, determine material chemical...
Abstract The potential of six industrial by-products for use as phosphorus-sorbing materials (PSMs) in solutions was evaluated. These included two different acid mine drainage treatment residuals (AMDR1 and AMDR2), water residual (WTR), fly ash, bauxite mining residual, flue gas desulfurization product (FGD). Characterization the their mechanisms sorption retention inorganic phosphorus (P) from solution identified those PSMs that sorbed primarily by an iron aluminum (Fe/Al) mechanism, a...
Reduction of phosphorus (P) inputs to surface waters may decrease eutrophication. Some researchers have proposed filtering dissolved P in runoff with P-sorptive byproducts structures placed hydrologically active areas high soil concentrations. The objectives this study were construct and monitor a removal structure suburban watershed test the ability empirically developed flow-through equations predict performance. Steel slag was used as sorption material structure. Water samples collected...
Extreme precipitation events affect water quantity and quality in various regions of the world. Heavy 2019 resulted a record high area unplanted agricultural fields U.S. especially Maumee River Watershed (MRW). March–July phosphorus (P) loads from MRW drive harmful algal bloom (HAB) severity Lake Erie; hence changes management that influence P export can ultimately HAB severity. In this study, we found dissolved reactive (DRP) load was 29% lower than predicted, while particulate (PP) similar...
Reducing dissolved phosphorus (P) losses from legacy P soils to surface waters is necessary for preventing algal blooms. Phosphorus removal structures containing steel slag have shown success in treating runoff P, but little known about subsurface (tile) drainage. A ditch-style and structure were constructed using a bottom-up flow design tile Nearly 97% of was delivered during precipitation-induced events (as opposed baseflow) with inflow concentrations increasing rate. Structures handled...
Abstract Agricultural phosphorus (P) losses are harmful to water quality, but knowledge gaps about the importance of fertilizer management practices on new (recently applied) sources P may limit loss mitigation efforts. Weighted regression models applied subsurface tile drainage quality data enabled estimating associated with 155 applications in Ohio and Indiana, USA. Daily discharge dissolved reactive (DRP) total (TP) loads were used detect increases following each application which was...