Brief Summary of Minutes of Annual Meeting

1. Introductions: Meeting was started with introductions

2. Most of the meeting was dedicated to discuss about the new proposal and new directions. Also, the attendees talked about various venues to showcase NC1187 efforts (ASA-CSSA-SSSA meetings; AGU)

3. Annual report requirements: Ganga Hettiarachchi reminded the new report requirements and the formatting changes. The report needs to be submitted within 60 days of the Annual Meeting. Ganga Hettiarachchi will send out a request to the group to submit their state reports to compile the Annual Report.

4. State research reports: each attending member gave a brief report on their research activities in 2019 as well as on-going and future research plans. Ganga Hettiarachchi is to send out a notice to have everyone submit their reports to her by mid-February.

5. Discuss venues for 2020 Annual Meeting: The group decided to meet again at the 2020 ASA-CSSA-SSSA meeting, Phoenix, AZ.

6. Other business: potential collaborations and collaborative work

          The group decided to organize a symposium or a topical session for the 2020 ASA-CSSA-SSSA meeting to showcase NC1187 group activities. Wei Zhang is chairing the Environmental Quality Division in 2020,                   and the group decided that this community would be more appropriate for this session.

7. The leadership for the group- the group agrees to continue as is. 
   1. Chair – Ganga Hettiarachchi
   2. Vice Chair/Secretary- Wei Zhang

Members of this project are applying a wide range of analytical tools to elucidate mechanisms of physical and chemical protection of carbon in soils, redox cycling of iron, cycling, reaction pathways and plant uptake of nutrients and contaminants in soils, micro-scale hot-spots of greenhouse gas production within soil pore structure, colloid transport through soil, removal and in situ stabilization of soil contaminants, effect of climate change on soil structure, storage and transport of soil water and contaminant mobility, testing a few different wastewater treatment processes that will supply unrestricted reuse water, will recycle nutrients, and will sequester carbon in soils to help mitigate greenhouse gas increases in the atmosphere, and time-resolved simultaneous measurement of atmospheric aerosols. More detailed description of research outcomes by the group is presented below.

Understanding variability of porous media is important for initiating land management strategies. Objectives of study were to determine variability of computed tomography (CT)-measured pore characteristics and physical properties of porous media and combine these into principal components (PCs). Core samples were collected from three sites: silvopasture with vegetative buffers (SPBF), watersheds with vegetative buffers (PW), and crop management and prairie management (MP). Soil bulk density (BD), saturated hydraulic conductivity (K_s) and CT-measured pore characteristics were analyzed under buffers and management practices at SPBF; buffer and crop management practices at PW; and native prairie, restored prairie, conservation program, and crop rotation at the MP location. Measured data sets were combined by location for correlation analysis, descriptive statistics, variability analysis, principal component analysis (PCA), and discriminant analysis. Coefficients of variation (CV) showed numbers of pores, macroporosity, mesoporosity and K_s were most variable (CV > 0.35), whereas circularity, BD and silt content were least variable (CV < 0.15). The PCA grouped ten pore characteristics and physical properties into three PCs: porosity, water transport and texture. Redundancy analysis showed the soil porosity PC and pore numbers as the most dominant properties at all locations. Results indicate that establishment of vegetative buffers improves porosity.

Contaminated soils along the world’s coasts are at risk as global temperatures continue to increase and sea levels subsequently rise. As increased urbanization along the coastline continues, it is becoming more important to understand the effects of sea level rise (SLR) on local hydrology, chemistry, and the fate and transport of sorbed contaminants in soils. Arsenic (As) is of the utmost importance not only due to its carcinogenic nature, but also because of its sensitivity to redox potential, which, unlike other toxic trace metals, becomes increasingly mobile under reduced conditions. To assess the effects of SLR on coastal arsenic contamination, Dr. Sparks team at the University of Delaware utilized model systems in the laboratory to simulate SLR and flooding conditions in the environment.  

Sorption isotherms and pH envelopes of arsenate on goethite or ferrihydrite were carried out to observe arsenic sorption behavior on common iron (Fe) oxides in artificial river water (ARW), artificial seawater (ASW), or a 50/50 mix of the two waters (50/50). Completion of sorption isotherms at pH 6 revealed greater arsenate sorption on goethite in ASW, compared to ARW and 50/50, at the majority of the initial arsenate concentrations and especially at high concentrations. Arsenate sorption on ferrihydrite revealed about equal sorption in both ARW and ASW at all initial arsenate concentrations. The high surface area of ferrihydrite plays a much more significant role in sorption compared to ionic composition of the background media. The pH envelopes between arsenate and goethite or ferrihydrite were completed from pH 3 to 9 in ARW, ASW, and/or 50/50 and had an initial arsenate concentration of 1.67 mM As(V). Both mineral systems revealed similar trends in each water type, displaying a decrease in arsenate sorption to the mineral surface as pH increases in ARW and/or 50/50. Both mineral systems displayed an increase in arsenate sorption at high pH, >8, in ASW compared to ARW and/or 50/50. This is most likely due to the sorption of cations in ASW to the mineral surface that alleviate some of the electrostatic repulsion between the negatively charged surface and the arsenate oxyanion. Recently, solid phase samples from the pH envelope experiment were analyzed via X-ray absorption spectroscopy to determine the bonding environment surrounding As in each of the water types; these data are still being processed. Further experiments are being conducted, including determining the point of zero charge (PZC) before and after arsenate sorption in the pH envelopes to observe how significantly PZC affects sorption at high pH.

Additionally, experiments were conducted by the Spark’s group to further assess the effect of SLR and flooding on arsenic contamination by utilizing a microcosm setup and a model system. The system consisted of an As(V)-ferrihydrite coprecipitate in either ARW or ASW and was subjected to a redox gradient from about +200 to -300 mV. It was found that once iron-reducing conditions were achieved, at 0 mV and below, more of the As-ferrihydrite coprecipitate was transformed to magnetite, a mixed valence Fe(II/III) mineral, in ARW compared to ASW. Solid phase samples were also recently analyzed via X-ray absorption spectroscopy to probe the arsenic bonding environment. It is hypothesized that As is being assimilated into the magnetite structure as the mineral transforms from ferrihydrite to magnetite. Arsenic mobility is closely linked with the Fe cycle. Thus, understanding how both elements behave in fresh river water and seawater is imperative to management strategies and remediation plans in SLR impacted regions.

Research was conducted on Fe(II) sorption and redox mechanisms with phyllosilicates and dissolved silicate in flooded soil environments. Of particular interest was how dissolved silicon (Si) affects green rust formation as well as transformations after air-oxidation. Silicon is ubiquitous in natural waters and can accumulate on high surface area Fe (hydr)oxides to high total Si contents but this has never been studied during green rust formation. The results showed that even very high concentrations of Si did not prevent formation of green rusts. Silicon only inhibited green rust crystal growth when the Si/Fe molar ratio was 0.5 which can be found in high silicon groundwater environments. The effect of Si was more pronounced on mineral transformations by air-oxidation. When Si was more abundant than a 0.1 Si/Fe molar ratio, Fe did not recrystallize well and Fe(III)hydroxides were short-range ordered.

Dr. Zhang’s team at Michigan State university investigated the internalization of silver nanoparticles through plant leaf stomata and the uptake of silver nanoparticles by radish in soils with and without biochar amendment (0%, 0.1% and 1% biochar by weight). They also studied the Salmonella survival, bacterial microbiome and antibiotic resistance genes on lettuce shoots under soil surface irrigation with antibiotics-contaminated water using culture-dependent isolation method, metagenomics and high throughput qPCR.

Similar studies were conducted by Drs. Schwab, Strawn, and Hettiarachchi groups to understand plant uptake of inorganic contaminants. Schwab’s team at Texas A&M investigated the effect of in situ soil treatments on the phytoavailability of As. Strawn’s team at the University of Idaho studied how soil factors affect cadmium uptake by wheat grown in the Inland Pacific Northwest wheat growing regions. While Hettiarachchi group at Kansas State University (Borlaug Fellow from Ecuador) studied how soil inorganic and organic solids affecting Cd availability in soils collected from Ecuadorian cacao production systems.

Dr. Mainelis group at the Rutgers University (Cook Collge) continued the investigation into the potential exposures to nanoparticles due to the use of nanotechnology-enabled consumer sprays. In this part of the project, they investigated resuspension rates of particles resulting from the use of nanotechnology-enabled consumer nanosprays and then deposited on surfaces. Specifically, they investigated the effect of surface type, resuspension force, and sampling height on resuspension rate. They selected three Ag-based, three Zn-based and one Cu-based consumer sprays. The products were applied in a 5 x 9 x 8 ft3 chamber with controlled background particle concentration. After spraying for 5 min, the spray was allowed to settle for at least 24 hr before the resuspension experiments were performed. The resuspension of deposited particles was investigated as a function of flooring type (e.g., carpet and vinyl), resuspension force (e.g., walking by an adult and motion of a robotic sampler that simulated a child), and sampling height. Particle deposition was measured in terms of floor mass loading. Button Samplers (SKC Inc.) with 25-mm PTFE filters were used to collect sprays and resuspended particle mass at 0.3 m and 1.1 m heights, and in the experimenter's breathing zone (e.g., 1.5 m for adult and 0.3 m for simulated child). The resuspension rates were calculated for all investigated variables. Resuspension rates ranged from 10^-4 to 10^-1 h^-1, depending on the product, floor type, and sampling height. Resuspension rates were 30% to 320% higher for particles resuspended from carpet compared to vinyl, 3% to 195% higher when particles were measured at 0.3 m height than at 1.1 m height, and 19% to 243% higher when particles were resuspended by a walking adult compared to a moving robot. High particle concentrations observed at 0.3 m height showed that young children playing on the carpet could be exposed to high levels of particles resuspended by adults walking nearby. The observed results suggest that factors affecting particle resuspension, e.g., surface roughness, walking pace, and resuspension forces due to walking should be examined closely in future studies.

One of the biggest challenges for improving agricultural productivity and environmental sustainability is accurate prediction of the amount of P that will be transported to surface waters in a particular system. The P loading problems to surface waters occur because nutrient management plans do not correctly account for P loading potential of soils and availability of P for offsite transport. The core of the problem is that the soil tests were designed to monitor P availability for plant nutrient management. Research has shown that on some soils, P availability tests values are correlated with the amount of dissolved reactive P (DRP) transported off-site, which is the phase that directly contributes to eutrophication. However, it is commonly observed that test P is not correlated to total offsite P loading to surface waters. Total P loading includes DRP, particulate and organic P. Although the latter two phases are not directly available for uptake by algae, the P associated with these phases can mineralize, desorb or dissolve, thereby releasing P to the solution phase and contributing to environmentally-available P. The extent to which this occurs is not known, and requires knowledge of P speciation of the organic and suspended particles. A few members of NC1187, investigate speciation of soil P, transport of soil solution and particulate P, and recovery of P for use as fertilizers for waste waters. Results will provide new knowledge that will lead to improved water quality and better nutrient use efficiency in agriculture.

Dr. Strawn’s team at the University of Idaho conducted research on a wastewater treatment process that will supply unrestricted reuse water, will recycle nutrients, and will sequester carbon in soils to help mitigate greenhouse gas increases in the atmosphere. The team conducted experiments on soil P availability and watershed export from a long-term agriculture watershed research site located on the R. J. Cook Agronomy Farm (CAF) on the Palouse landscape in the Northwest Wheat and Range Region. In this project, the team speciated P as inorganic and organic phases. They also conducted research to understand distribution, speciation, and availability of phosphorus in a forested landscape in Lake Tahoe National Forest in California.

Dr. Yiji Arai’s team at the University of Illinois studies the impact of extreme weather conditions on the loss of particulate P and dissolved reactive P(DRP) which will be assessed to manage the nutrient budget in agricultural systems. They plan to collect tile waters and surface runoff at study site in east-central Illinois with various cropping systems and agricultural management. This will be done during high flow events (e.g., typically March through May in the Midwest), where they can obtain liters of water for this in-depth chemical analysis using novel techniques (e.g., 31P-nuclear magnetic resonance (NMR), P K-edge XANES). The team is also planning to conduct another study dealing with the effects of drought condition on particulate P which will also start at the same study site. The team will conduct laboratory incubation study of OM oxidation and the kinetic samples will be tested for physicochemical properties (e.g., CEC, pH, mineralogy, aggregate stability, particle size, mineralogy, %OC). The samples will also be fractionated for total inorganic and organic P. The inorganic and organic P speciation will be conducted using P-31 NMR and P K-edge XANES analysis.

At Kansas State University, Dr. Hettiarachchi’s team and their colleagues from College of Engineering (Drs. Prathap Parameswaran and Stacy Hutchinson) are working on testing the hypothesis that innovative wastewater treatment technologies can produce potable water from different sources (municipal or livestock wastewaters such as swine wastewater), while recovering nutrients and producing soil amendments for crop production and protecting the environment. Anaerobic membrane bioreactors (AnMBR) and Microbial Reverse Electrodialysis Cells are new technologies that can operate sequentially and remove harmful substances from wastewater to produce clean water for reuse. These processes also produce nutrient-rich co-products, allowing balanced/tailored nitrogen and phosphorus applications. Inclusion of new resource/reuse technologies will make agriculture production more sustainable, economical, and environmentally-friendly by reducing food and water quality deterioration from land application of livestock wastewaters and increasing water availability. In 2019, they focused on using calcium oxide for complete removal of P and S. Current work also includes optimizing solubility and release rate of recovered nutrient products (RNPs) rich in P.

Additionally, Hettiarachchi’s team continued to investigate the new fertilizer enhancement products and formulations that will enable P and micronutrients to diffuse and/or furnish more plant-available nutrients. The group used synchrotron-based x-ray techniques to obtain nutrient reaction products (speciation) to better understand P or micronutrient mobility and potential plant availability in soils. Improved understanding of the fundamental mechanisms responsible for the enhanced mobility or availability of different P and micronutrient fertilizers in carefully selected soil types will help to determine under which circumstances certain P, and micronutrient fertilizers offer the potential to increase agricultural productivity significantly. Our work shows that the studied commercially available fertilizer enhancement products (co-polymers or humic substances) do not improve the phosphorus or the micronutrient mobility or lability in soils consistently.

In 2019, many of our group members were also focused on increasing communication of science through organizing symposiums at various scientific meetings. In general, the symposiums focused on improving our knowledge on fate and risks of nutrients or contaminants in soil, water and food crops, and contribute to better strategies for protecting ecosystem and human health.  Examples are: Strawn co-organized and co-convened a special symposium (Soil Chemistry division) at the ASA-CSSA-SSSA 2019 annual meeting entitled “Paradigm shifts in soil chemistry” (https://scisoc.confex.com/scisoc/2019am/meetingapp.cgi/Session/19223) to bring attention to the continuously evolving field of soil chemistry as new methodologies and analytical capabilities expand our understanding and challenge current theories. Hettiarachchi co-organized and co-convened three topical sessions at the same meeting. Those were “Coupling and Feedbacks of Phosphorus and Nitrogen in Soil and Ecosystems: “Missing Gaps and Future Directions” (https://scisoc.confex.com/scisoc/2019am/meetingapp.cgi/Session/19345); “Soil Chemistry and Human Health” (https://scisoc.confex.com/scisoc/2019am/meetingapp.cgi/Session/19294); “Advances of in Situ Sensors: Measuring Soil Chemical Properties and Processes” (https://scisoc.confex.com/scisoc/2019am/meetingapp.cgi/Session/19292).

Published written works

Akula, P., D. Little, A.P. Schwab. 2019. Thermodynamic evaluation of smectite treated with Hydrogen Ion Stabilizer. J. Matl. Civ. Engg. (in press)

Anderson, S.H., and R.P. Udawatta.  2019.  Agroforestry:  A system for improving soil health.  pp. 317-334. In M.R. Mosquera-Losada and R. Prabhu (eds.) Agroforestry for Sustainable Agriculture.  Burleigh Dodds Science Publishing, Cambridge, United Kingdom.

Alagele, S.M., S.H. Anderson, and R.P. Udawatta.  2019.  Biomass and buffer management practice effects on soil hydraulic properties compared to grain crops for claypan landscapes.  Agroforestry Systems 93:1609-1625.

Alagele, S.M., S.H. Anderson, R.P. Udawatta, K.S. Veum, and L.M. Rankoth.  2019.  Effects of conservation practices on soil quality compared to a corn/soybean rotation on a claypan soil.  J. Environ. Qual.  48:1694-1702.

Cercioglu, M., S.H. Anderson. R.P. Udawatta, and S.M. Alagele.  2019.  Effect of cover crop management on soil hydraulic properties.  Geoderma 343:247-253.

Chuang, Y.-H., C.-H. Liu, J.B. Sallach, R. Hammerschmidt, W. Zhang, S.A. Boyd, and H. Li. 2019. Mechanistic study on uptake and transport of pharmaceuticals in lettuce from water. Environment International, 131, 104976. DOI: 10.1016/j.envint.2019.104976.

Coelho, M. J. A., D. R. Diaz, G. M. Hettiarachchi, F. D. Hansel, P. S. Pavinato. 2019. Soil phosphorus fractions and legacy in a corn-soybean rotation on Mollisols in Kansas, USA, Geoderma Regional, 18: e00228.

Jeon, S., C.S. Krasnow, G.D. Bhalsod, B.R. Harlan, M.K. Hausbeck, S.I. Safferman, and W. Zhang. 2019. Rapid sand filtration of recycled irrigation water controlled Pythium root rot of poinsettia in greenhouse. HortTechnology, 29(5), 578–589. DOI: 10.21273/HORTTECH04226-18.

He, J., D. Wang, W. Zhang, and D. Zhou. 2019. Deposition and release of carboxylated graphene in saturated porous media: Effect of transient solution chemistry. Chemosphere, 235, 643-650. DOI: 10.1016/j.chemosphere.2019.06.187.

He, J., Y. Zhang, Y. Guo, G. Rhodes, J. Yeom, H. Li, and W. Zhang. 2019. Photocatalytic degradation of cephalexin by ZnO nanowires under simulated sunlight: Kinetics, influencing factors, and mechanisms. Environment International, 132, 105105. DOI: 10.1016/j.envint.2019.105105.

Li, Y., J.B. Sallach, W. Zhang, S.A. Boyd, and H. Li. 2019. Insight into the distribution of pharmaceuticals in soil-water-plant systems. Water Research, 152, 38-46. DOI: 10.1016/j.watres.2018.12.039.

Liu, C.-H., W. Chu, H. Li, S.A. Boyd, B.J. Teppen, J. Mao, J. Lehmann, and W. Zhang. 2019. Quantification and characterization of dissolved organic carbon from biochars. Geoderma, 335, 161-169. DOI: 10.1016/j.geoderma.2018.08.019.

Liu, C.-H., Y.-H. Chuang, H. Li, S.A. Boyd, B.J. Teppen, J.M. Gonzalez, C.T. Johnston, J. Lehmann, and W. Zhang. 2019. Long-term sorption of lincomycin to biochars: The intertwined roles of pore diffusion and dissolved organic carbon. Water Research, 161, 108-118. DOI: 10.1016/j.watres.2019.06.006.

Norkaew, S., R.J. Miles, D.K. Brandt, and S.H. Anderson.  2019.  Effects of 130 years of selected cropping management systems on soil health properties for Sanborn Field.  Soil Sci. Soc. Am. J.  83:1479-1490.

Shen, Y., R.D. Stedtfeld, X. Guo, G.D. Bhalsod, S. Jeon, J.M. Tiedje, H. Li, and W. Zhang. 2019. Pharmaceutical exposure changed antibiotic resistance genes and bacterial communities in soil-surface- and overhead-irrigated greenhouse lettuce. Environment International, 131, 105031. DOI: 10.1016/j.envint.2019.105031.

Song, E., X. Pan, R.J. Kremer, K.W. Goyne, S.H. Anderson, and X. Xiong.  2019.  Influence of repeated application of wetting agents on soil water repellency and microbial community.  Sustainability 11(16): 4505, pp 1-13.  Special Issue:  Sustainability of Microbial Ecosystems and Aquatic Microbial Diversity.

Wang, D., N.B. Saleh, W. Sun, C.M. Park, C. Shen, N. Aich, W.J.G.M. Peijnenburg, W. Zhang, Y. Jin, and C. Su. 2019. Next-generation multifunctional carbon-metal nanohybrids for energy and environmental applications. Environmental Science & Technology, 53(13), 7265-7287. DOI: 10.1021/acs.est.9b01453.

Weeks, J.J., Jr. and G.M. Hettiarachchi. 2019. A Review of the Latest in Phosphorus Fertilizer Technology: Possibilities and Pragmatism. J. Environ. Qual. 48:1300-1313.

Weeks, J.J., Jr. and G.M. Hettiarachchi. 2020. Source and Formulation Matter: New Insights into Phosphorus Fertilizer Fate and Transport in Mildly Calcareous Soils. Soil Sci. J. Am. (Accepted)

Zaibon, S., S.H. Anderson, K.S. Veum, and S.I. Haruna.  2019.  Soil thermal properties affected by topsoil thickness in switchgrass and row crop management systems.  Geoderma 350:93-100.

Scientific and Outreach Oral Presentations:

Acikgoz, Handan Sahin, S.H. Anderson, and R. Udawatta.  2019.  Water infiltration in claypan soils influenced by agroforestry and grass buffers for row crop management systems.  10th International Soil Congress, 17-19 June, 2019, Ankara, Turkey.

Acikgoz, Sebahattin, S.H. Anderson, C.J. Gantzer., A.L. Thompson, and R.J. Miles.  2019.  Long-term soil and crop management effects on soil physical properties related to soil erodibility.  10th International Soil Congress, 17-19 June, 2019, Ankara, Turkey.

Alagele, S., S.H. Anderson, R.P. Udawatta, K.S. Veum, and L. Rankoth.  2019.  Effects of conservation management practices on soil quality parameters compared to row crop management.  Book of Abstracts p. 206.  4th World Congress on Agroforestry, 20-22 May 2019, Montpellier, France.

Alagele, S.M., S.H. Anderson, R.P. Udawatta, K.S. Veum, and L.M. Rankoth.  2019.  Effects of selected conservation management practices on soil quality compared to crop management for claypan soils.  2019 American Society of Agronomy/Soil Science Society of America International Meeting Abstracts.  10-13 November, San Antonio, Texas.

Alagele, S.M., S.H. Anderson, M.G. Mohammed, and R.P. Udawatta.  2019.  Landscape patterns of evapotranspiration for conservation management practices compared to crop management using Python-based GIS.  2019 American Society of Agronomy/Soil Science Society of America International Meeting Abstracts.  10-13 November, San Antonio, Texas.

Alagele, S.M., S.H. Anderson, and R.P. Udawatta.  2019.  Agroforestry, grass, biomass crop, and row-crop management effects on soil water dynamics for claypan landscapes. 2019 Soil Science Society of America International Soils Meeting Abstracts.  6-9 January, San Diego, California.

Alasmary, Z., G.M. Hettiarachchi, K. L. Roozeboom, L.C. Davis, L.E. Erickson. 2019. Phytostabilization of a Contaminated Shooting Range Soil Using Biofuel Crop and Soil Amendments. ASA-CSSA-SSSA International Annual Meeting, Nov. 10-13, San Antonio, TX.

Almutari, M., G.M. Hettiarachchi, Mary B Kirkham, A. Fritz, D.M. Daiz, S.L. Hutchinson, and L. Erickson. Agronomic Biofortification of Wheat with Zn through Co-Addition of Organic C with Zn Fertilizers. SSSA International Annual Soils Meeting. Jan 6-9, San Diego, CA.

Alvarado, T., P Schwab, A.P. Lee, B. Tomlin. 2019 Selection of internal standards for ICP-MS analysis of as in soils. ASA, CSSA and SSSA International Annual Meetings, San Antonio.

Betts, A.R., Evers, A., Fischel, M., Tappero, R. and Sparks, D.L. (2019). Silicon coprecipitation with green rust: Effects on formation and air-oxidation. Oral presentation. Soil Science Society of America Annual Meeting. San Antonio, Tx.

Betts, A.R. (2019). Clay mineral influences on the formation of ferrous layered double hydroxides (LDH) in flooded soil environments. Oral presentation. Newark, DE.

Cercioglu, M., S.H. Anderson, R. Udawatta, and S.M. Alagele.  2019.  Soil hydraulic properties affected by cover crop management practices.  p. 107. Soil and Water Conservation Society International Conference Abstracts, 28-31 July, Pittsburgh, Pennsylvania.

Chuang, Y.-H., C.-H. Liu, R. Hammerschmidt, W. Zhang, S.A. Boyd, and H. Li. 2019. Relation of plant physiological processes and compound physicochemical properties to lettuce uptake of pharmaceuticals. ASA-CSSA-SSSA International Annual Meeting, San Antonio, TX, November 10-13.

Coelho, M.J.A., D.A. Ruiz Diaz, G.M. Hettiarachchi and P.S. Pavinato. 2019. Changes in Soil Phosphorus Lability Promoted by Fertilizer Placement after a 10-Year Corn-Soybean Rotation. SSSA International Annual Soils Meeting. Jan 6-9, San Diego, CA.

Diggins, D.C., S.H. Anderson, S.M. Alagele, and R.P. Udawatta.  2019.  Cover crop and biofuel effects on hydraulic properties for claypan soils.  2019 American Society of Agronomy/Soil Science Society of America International Meeting Abstracts.  10-13 November, San Antonio, Texas.

Ding, Y. P. Schwab, M. A. Armienta, and Deng, Y. Phase transformation and crystallinity change of iron oxide nanoparticles and their retention of As, Cu, and Zn in simulated acid mine drainage neutralization by calcite and dolomite. 55th Annual Meeting of The Clay Minerals Society. University of Illinois at Urbana-Champaign. Illinois, USA. June 11-14,  2018.

Galkaduwa, M.B. and G.M. Hettiarachchi. 2019. Diffusion, Extractability, and Reaction Products of Zinc Fertilizers in a Mildly Calcareous Soil. ASA-CSSA-SSSA International Annual Meeting, Nov. 10-13, San Antonio, TX.

Gamage, K.H.H., G.M. Hettiarachchi, P. Parameswaran, and S. Hutchinson. 2019. Characterization, Transformations and Reaction Pathways of Phosphorus Based Recovered Nutrient Products from Wastewaters in Soils. ASA-CSSA-SSSA International Annual Meeting, Nov. 10-13, San Antonio, TX.

Gunathilaka, G., J. He, H. Li, W. Zhang, and E. Ryser. 2019. Fate of silver nanoparticles in lettuce wash water as impacted by chlorine and organic matter. ACS National Meeting & Exposition, San Diego, CA, August 25-29.

Gunathilaka, G., J. He, H. Li, W. Zhang, and E. Ryser. 2019. Behavior of silver nanoparticles under various wash water conditions for leafy green processing. International Association for Food Protection Annual Meeting, Louisville, KY,

He, J., Y. Li, H. Qi, H. Li, and W. Zhang. 2019. Biochar mediated the uptake of silver nanoparticles and ions by radish (Raphanus sativus). ASA-CSSA-SSSA International Annual Meeting, San Antonio, TX, November 10-13

He, R., Zhang. J., and Mainelis, G. 2019. Resuspension of Particles Deposited from Consumer Nanosprays: the Effect of Surface Type, Resuspending Force, and Sampling Height, Platform presentation at the 38th Annual Meeting of the American Association for Aerosol Research, October 13-18, 2019, Portland, OR.

He, J., L. Zhang, S.Y. He, E. Ryser, H. Li, and W. Zhang. 2019. Role of stomata in foliar sorption of silver nanoparticles by Arabidopsis thaliana. ACS National Meeting & Exposition, San Diego, CA, August 25-29.

Hettiarachchi, G.M. 2019. Sensors in Soil Chemistry: Opportunities and Challenges. ASA-CSSA-SSSA International Annual Meeting, Nov. 10-13, San Antonio, TX.

Hettiarachchi, G.M., C. P. Attanayake, P. P. Defoe, J. Weeks, S. Martin, W.L. Hargrove, and C. Sobin. Manipulation of bioavailability of contaminants in urban garden and yard soils. International Conference of Biogeochemistry Trace Elements. May 5-9, Nanjing, China.

Hettiarachchi, G.M. and J.J. Weeks. 2019. Manipulating Reaction Pathways to Optimize Fertilizer P Availability. SSSA International Annual Soils Meeting. Jan 6-9, San Diego, CA.

Iqbal, A., M. Arshad, R. Karthikeyan, T.J. Gentry, J. Rashid, I. Ahmed, A.P. Schwab. 2019. Diesel degrading bacterial endophytes with plant growth promoting potential isolated from a petroleum storage facility. 3 Biotech. 9:35.  https://doi.org/10.1007/s13205-018-1561-z

Jeon, S., C. Krasnow, G. Bhalsod, B. Harlan, M. Hausbeck, S. Safferman, and W. Zhang. 2019. International Symposium on Advanced Technologies and Management for Innovative Greenhouses (GreenSys 2019), Angers, France, June 16-20.

Lee, A. and A.P. Schwab. 2019. Phytoremediation of arsenic and the immobilization of lead in soil: The impacts of apatite particle size. ASA, CSSA and SSSA International Annual Meetings, San Antonio.

Limon, V., J.A. Aitkenhead-Peterson, M. Smith, C. Speights, B. Barton, M. Lashley, J. Tomberlin, J. Mowrer, and A. P. Schwab. 2018. Effect of mass mortality events on water exractable soil nutrients. Environmental Society of America. New Orleans.

Liu, C.-H., Y.-H. Chuang, H. Li, S.A. Boyd, B.J. Teppen, and W. Zhang. Sorption of lincomycin by biochars produced from agricultural and urban wastes. ASA-CSSA-SSSA International Annual Meeting, San Antonio, TX, November 10-13.

Pandey, A., A.P. Schwab, D.W. Ming, B. Sutter, J. Gruener, D. Little. 2019. Characterizing binder-stabilized composites synthesized from a Martian soil simulant for extraterrestrial construction. ASA, CSSA and SSSA International Annual Meetings, San Antonio.

Pandey, A., A.P. Schwab, D.W. Ming, B. Sutter, J. Gruener, D. Little. Chemical, mineralogical, and engineering properties of composites of Martian and lunar simulants as extraterrestrial construction materials. ASA, CSSA and SSSA International Annual Meetings, San Antonio.

Pandey, A., A.P., B. Birgisson, S. Banerjee, D. Ming. 2019. Extraterrestrial construction with 3D printing: material selection and testing. 2018-2019 International Soils Meeting. San Diego, California.

Rhodes, G., Y.-H. Chuang, W. Zhang, S.A. Boyd, and H. Li. 2019. Uptake of cephalexin from water to three vegetables. SSSA International Soils Meeting, San Diego, CA, January 6-9.

Sanchez, J.Z., Tappero, R., and Sparks D.L. 2019. The impact of redox potential and salinity on arsenic cycling and mobility in iron oxide systems. Oral presentation. Soil Science Society of America (SSSA) International Soils Meeting, San Diego, CA.

Schwab, A.P., A. Pandey, B. Birgisson, S. Banerjee, D. Ming. 2019. Rapid 3D printing for construction of extraterrestrial buildings with indigenous materials. 2018-2019 International Soils Meeting. San Diego, California.

Shen, Y., W. Zhang, H. Li, and E.T. Ryser. 2019. Uptake and accumulation of antibiotics and associated impact on bacterial microbiome and salmonella survival in greenhouse lettuce. ASA-CSSA-SSSA International Annual Meeting, San Antonio, TX, November 10-13.

Shen, Y., Z. Chen, H. Li, E.T. Ryser, R.D. Stedtfeld, J.M. Tiedje, and W. Zhang. 2019. Microbiome and antibiotic resistome in soil and plant systems. ASA-CSSA-SSSA International Annual Meeting, San Antonio, TX, November 10-13.

Shen, Y., W. Zhang, Hui Li, and E. Ryser. 2019. Antibiotic resistance genes, microbiomes, and Salmonella survival in lettuce exposed to antibiotics via soil surface irrigation. ACS National Meeting & Exposition, San Diego, CA, August 25-29.

Singh, N. J.K. Dhaliwal, S.Katuwal, S. Kumar, L.W. de Jonge, R.P. Udawatta, and S.H. Anderson.  2019.  Near-surface soil hydrological properties measured using computed tomography and classical approaches under grazed pasture and croplands. 2019 American Society of Agronomy/Soil Science Society of America International Meeting Abstracts.  10-13 November, San Antonio, Texas.

Singh, N., S. Katuwal, S. Kumar, L.W. de Jonge, R.P. Udawatta, and S.H. Anderson.  2019.  Use of high-resolution CT scanning to characterize soil pore network as influenced by long-term application of cattle manure and synthetic fertilizers.  2019 American Society of Agronomy/Soil Science Society of America International Meeting Abstracts.  10-13 November, San Antonio, Texas.

Tahtouh, J., R. Mohtar, A. Assi, A.P. Schwab, A. Jantrania, Y. Deng, C. Munster. 2019. Impact of brackish groundwater and treated wastewater on soil chemical and mineralogical properties. Sci. Total Environ.  647:99-109

Udawatta, R.P., L.M. Rankoth, C.J. Gantzer, S. Jose, and S.H. Anderson.  2019.  Cover crops and soil water dynamics of claypan soils with corn-soybean rotation.  2019 Soil Science Society of America International Soils Meeting Abstracts.  6-9 January, San Diego, California.

Weeks, J.J. and G.M. Hettiarachchi. 2019. Should Greater Emphasis be Placed on Phosphorus Fertilizer Source Selection to Build Better P Management Systems? ASA-CSSA-SSSA International Annual Meeting, Nov. 10-13, San Antonio, TX.

Welch, S., G.M. Hettiarachchi, N. Bello, and P.D. Alderman. 2019. Current Needs and Transitional Concepts Related to Soil Sensors. ASA-CSSA-SSSA International Annual Meeting, Nov. 10-13, San Antonio, TX.

Yi,Y., A.P. Schwab, K. Sung. 2019. Effects of soil amendments on the quality of soil remediated by thermal desorption.  ASA, CSSA and SSSA International Annual Meetings, San Antonio.

Zhang, W., Y. Shen, Z. Chen, R.D. Stedtfeld, J.M. Tiedje, and H. Li. 2019. Antibiotic resistance in soil, water and plant systems. International Workshop on Organic Pollutants in Agro-Environments, Nanjing, China, October 12-15.

Zhang, W., H. Li, M.K. Hausbeck, and J.M. Tiedje. 2019. Emerging trends on biocolloids in agroecosystems. The Second International Conference on All Material Fluxes in River Eco-systems (AMFR 2019), Beijing, China, October 11-13.

Zhang, W., J. He, L. Zhang, S. Y. He, E.T. Ryser, and H. Li. 2019. Stomata facilitated sorption of silver nanoparticles by Arabidopsis thaliana. EGU General Assembly 2019, Vienna, Austria, April 7-12.

Zuber, S.M., K.S. Veum, R. Myers, N.R. Kitchen, and S.H. Anderson.  2019.  On-farm soil health indicators across Missouri.  2019 American Society of Agronomy/Soil Science Society of America International Meeting Abstracts.  10-13 November, San Antonio, Texas.

Theses and Dissertations

Betts, A.R. 2019. Clay mineral influences on the formation of ferrous layered double hydroxides (LDH) in flooded soil environments. University of Delaware, PhD dissertation.

Weeks, J.J. 2019. Improving environmental health: Investigations into soil lead and phosphorus fate and transport. Kansas State University, PhD dissertation.