About
As the Director of Research and Innovation at Phigenics, I lead cutting-edge initiatives…
Activity
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A new handheld tool shows promise for measuring soil carbon stocks at scale, a crucial step in quantifying regenerative agriculture’s capacity for…
A new handheld tool shows promise for measuring soil carbon stocks at scale, a crucial step in quantifying regenerative agriculture’s capacity for…
Liked by Patrick Freeze, Ph.D.
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It is with deep sorrow that we announce the passing of Kennard E. Pohlman, the visionary and founder of Midwest Laboratories, on Saturday, January…
It is with deep sorrow that we announce the passing of Kennard E. Pohlman, the visionary and founder of Midwest Laboratories, on Saturday, January…
Liked by Patrick Freeze, Ph.D.
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It is almost 40 years ago that I studied how the soil pH of Oxisols was affected by the length of a fallow period. It is a resilient ability of the…
It is almost 40 years ago that I studied how the soil pH of Oxisols was affected by the length of a fallow period. It is a resilient ability of the…
Liked by Patrick Freeze, Ph.D.
Experience
Education
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Washington State University
Activities and Societies: Graduate Student Association, WSU Fulbright Applicant Advisor, Association of International Agriculture and Rural Development Executive Committee
U.S. Fulbright Scholar, USDA NIFA Needs Fellow
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Activities and Societies: Alpha Zeta, Student Association of International Water Issues
Minor: Analytical Chemistry.
NASA and NSF EPSCoR Scholarship Recipient
Focus: Environmental chemistry, metal remediation, forest soil biogeochemistry, EPA policy oversight. -
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Publications
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Phenazine-1-Carboxylic Acid-Producing Bacteria Enhance the Reactivity of Iron Minerals in Dryland and Irrigated Wheat Rhizospheres
Environmental Science and Technology, ACS Publications
Phenazine-1-carboxylic acid (PCA) is a broad-spectrum antibiotic produced by rhizobacteria in the dryland wheat fields of the Columbia Plateau. PCA and other phenazines reductively dissolve Fe and Mn oxyhydroxides in bacterial culture systems, but the impact of PCA upon Fe and Mn cycling in the rhizosphere is unknown. Here, concentrations of dithionite-extractable and poorly crystalline Fe were approximately 10% and 30–40% higher, respectively, in dryland and irrigated rhizospheres inoculated…
Phenazine-1-carboxylic acid (PCA) is a broad-spectrum antibiotic produced by rhizobacteria in the dryland wheat fields of the Columbia Plateau. PCA and other phenazines reductively dissolve Fe and Mn oxyhydroxides in bacterial culture systems, but the impact of PCA upon Fe and Mn cycling in the rhizosphere is unknown. Here, concentrations of dithionite-extractable and poorly crystalline Fe were approximately 10% and 30–40% higher, respectively, in dryland and irrigated rhizospheres inoculated with the PCA-producing (PCA+) strain Pseudomonas synxantha 2–79 than in rhizospheres inoculated with a PCA-deficient mutant. However, rhizosphere concentrations of Fe(II) and Mn did not differ significantly, indicating that PCA-mediated redox transformations of Fe and Mn were transient or were masked by competing processes. Total Fe and Mn uptake into wheat biomass also did not differ significantly, but the PCA+ strain significantly altered Fe translocation into shoots. X-ray absorption near edge spectroscopy revealed an abundance of Fe-bearing oxyhydroxides and phyllosilicates in all rhizospheres. These results indicate that the PCA+ strain enhanced the reactivity and mobility of Fe derived from soil minerals without producing parallel changes in plant Fe uptake. This is the first report that directly links significant alterations of Fe-bearing minerals in the rhizosphere to a single bacterial trait.
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The Use of Fe-Rich Compost for the Amelioration of As-Contaminated Soils
Mineralogical Society, Goldschmidt 2013, Presentation Abstract
Presentation abstract for the Goldschmidt 2013 Geochemical Conference, held in Bologna, Italy.
Freeze P, Harsh J, Shi Z, Abi-Ghanem R & Okubara P
Mineralogical Magazine Jul 2013, 77 (5) 1058-1124; DOI: 10.1180/minmag.2013.077.5.6Other authorsSee publication -
Abstract: Biogeochemistry of a soil catena in the eastern Sierra Nevada Range, NV
68th International Soil and Water Conservation Society International Annual Conference Abstract Book
As a field/lab project, students in the Soil Biogeochemistry class of the University of Nevada, Reno described and characterized five pedons at Little Valley, NV, at the eastern edge of the Sierra Nevada. Characterizing and understanding the pedogenesis of this and other catenas could be used as a baseline for assessing the effects of management decisions, fire, and climate-change.
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Intermittent Rainstorms Cause Pulses of Nitrogen, Phosphorus, and Copper in Leachate from Compost in Bioretention Systems
Journal: Science of the Total Environment
Bioretention systems rely on vegetation and mixtures of soil, sand, and compost to filter stormwater runoff. However, bioretention systems can also leach metals and nutrients, and compost may be a major contributor to this leaching. To safely implement bioretention systems, it is crucial to determine the composition of compost leachate. We characterized and quantified the leachate composition of compost following intermittent, simulated storm events. Columns of municipal compost were irrigated…
Bioretention systems rely on vegetation and mixtures of soil, sand, and compost to filter stormwater runoff. However, bioretention systems can also leach metals and nutrients, and compost may be a major contributor to this leaching. To safely implement bioretention systems, it is crucial to determine the composition of compost leachate. We characterized and quantified the leachate composition of compost following intermittent, simulated storm events. Columns of municipal compost were irrigated to simulate 6-month, 24-hour rain storms in the Seattle-Tacoma region. Outflow was analyzed for pH, electrical conductivity (EC), particulate concentration, surface tension, dissolved organic carbon (DOC), nitrogen, phosphorus, and copper. Results indicate a decrease of chemical concentrations over the course of individual storms and following repeated storms, but each new storm released another peak of constituents. The decrease in phosphorus, copper, and DOC concentrations with repeated storms was slower than for nitrate and EC. Nuclear magnetic resonance (NMR) and Fourier transform infrared spectroscopy (FTIR) showed that the DOC consisted mainly of aliphatic and aromatic components typical of fulvic and humic acids. Less than 3% of the original copper content from the compost leached out even after nine storm events. Nonetheless, copper concentrations in the leachate exceeded regulatory discharge standards. Our results show that compost can serve as a sustained source of leaching of nutrients and metals.
Other authors
Projects
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Ph.D. Dissertation: Reducing Arsenic and Lead Mobility and Bioavailability in Contaminated Soil and Stormwater Runoff
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Investigation of physico-chemical properties of iron-enhanced biofiltration media, and its capacity to attenuate arsenic in soil and stormwater runoff (kinetics, adsorption and transport modeling)
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U.S. Fulbright Scholar Award, 2015-2016: Heavy Metals and Plant Uptake: Cadmium Contamination in Rice Paddies (Thailand)
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Kasetsart University, Bangkok Thailand.
Investigating the physical and chemical properties of rice husk biochar and its ability to reduce cadmium availability and uptake in rice paddies, Mae Tak, Mae Sot Province, Thailand -
Biogeochemistry of a soil catena in the eastern Sierra Nevada Range, NV
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As a field/lab project, students in the Soil Biogeochemistry class of the University of Nevada, Reno described and characterized five pedons at Little Valley, NV, at the eastern edge of the Sierra Nevada.
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Ghanaian EPA Policy Workshop: Ghana, Africa
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"Empowering young environmental leaders in Ghana, the U.S. and Liberia"
Sponsor: ELAW & Bureau of International Organization Affairs
Technical Aspects of Tailings, Cyanide Containment, and Environmental Assessments: Comparative Policy and Procedure Study on Mining in Western Ghana
Focus: Environmental assessment processes, proper mining practices, impacts on rural farmers (Tarkwa)
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Field Methods in Ecohydrology: Studies in an Urban Watershed
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Chemical and biological assessment of impaired waters, 303(d): Alum Creek, Reno NV.
Site assessment included sample analysis for nitrogen, phosphorus, pH, E.coli, heavy metals, and turbidity, as well as EC, temperature, and creek discharge rates. Data was presented to city managers and the neighboring homeowners association.
Honors & Awards
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U.S. Fulbright Scholar Award
U.S. Fulbright Program
Academic year: 2015-2016
Location: Kasetsart University, Bangkok, Thailand -
Association of International Agriculture and Rural Development (AIARD) Future Leaders Forum Award, Washington D.C.
AIARD
AIARD Future Leader Representative, 2014-2015
http://www.aiard.org/annual-conference-2014.html -
USDA National Institute of Food and Agriculture (NIFA) Graduate Fellow
USDA NIFA - Ph.D. WSU
USDA NIFA Fellow - August 2012-2013
Ph.D. Graduate Student, Washington State University
Organized 2-month international research exchange under USDA NIFA Fellowship:
1) Naples: Solid-state C13 Nuclear Magnetic Resonance training - Alessandro Piccolo and Ricardo Spaccini Group
2) Bologna: Marco Bittelli Group: Field research: viticulture research, assessing groundwater movement, soil and root respiration studies, biofuels (switchgrass)
3) Zurich: Rainer Schulin…USDA NIFA Fellow - August 2012-2013
Ph.D. Graduate Student, Washington State University
Organized 2-month international research exchange under USDA NIFA Fellowship:
1) Naples: Solid-state C13 Nuclear Magnetic Resonance training - Alessandro Piccolo and Ricardo Spaccini Group
2) Bologna: Marco Bittelli Group: Field research: viticulture research, assessing groundwater movement, soil and root respiration studies, biofuels (switchgrass)
3) Zurich: Rainer Schulin Group: Analytical methods for investigating metal contamination in soils.
4) Presentated at Goldschmidt 2013 - Florence: The Use of Fe-Rich Compost for the Amelioration of As-Contaminated Soils
Organizations
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U.S. Fulbright Association
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WSU Graduate and Professional Student Association
GPSA Senator - Crops and Soils
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Association of International Agriculture and Rural Development (AIARD)
Future Leader Forum Representative, AIARD Executive Committee
-http://www.aiard.org/future-leaders-forum-2014.html
More activity by Patrick
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Congratulations to Marcelo Moretti and Linda Brewer at Oregon State University for publishing this excellent, highly visual, and free guide titled…
Congratulations to Marcelo Moretti and Linda Brewer at Oregon State University for publishing this excellent, highly visual, and free guide titled…
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This report from the Australian Broadcasting Corporation (ABC) features perspectives from SHI Chief Scientific Officer Dr. Cristine Morgan, who…
This report from the Australian Broadcasting Corporation (ABC) features perspectives from SHI Chief Scientific Officer Dr. Cristine Morgan, who…
Liked by Patrick Freeze, Ph.D.
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Approximately 35% of the US Corn Belt has lost 100% of its topsoil, or A horizon. This results in an estimated economic loss of $2.8 billion and 6%…
Approximately 35% of the US Corn Belt has lost 100% of its topsoil, or A horizon. This results in an estimated economic loss of $2.8 billion and 6%…
Liked by Patrick Freeze, Ph.D.
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🌟 Congratulations to Dr. Bharat Acharya on receiving the 2024 Organic Achievement Award! Dr. Acharya was recently honored with the prestigious…
🌟 Congratulations to Dr. Bharat Acharya on receiving the 2024 Organic Achievement Award! Dr. Acharya was recently honored with the prestigious…
Liked by Patrick Freeze, Ph.D.
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Happy New Year, 2025! Wishing everyone a year filled with joy, love, good health, and peace. Here's to new beginnings and endless possibilities! 🙂
Happy New Year, 2025! Wishing everyone a year filled with joy, love, good health, and peace. Here's to new beginnings and endless possibilities! 🙂
Liked by Patrick Freeze, Ph.D.
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My 2025 Goal for LabMODO (And How I’m Going to Hit It) 𝟭𝟬𝗸 𝘂𝘀𝗲𝗿𝘀 𝗯𝘆 𝗗𝗲𝗰𝗲𝗺𝗯𝗲𝗿 𝟯𝟭𝘀𝘁. How do I get there? 𝗣𝗮𝗿𝘁𝗻𝗲𝗿…
My 2025 Goal for LabMODO (And How I’m Going to Hit It) 𝟭𝟬𝗸 𝘂𝘀𝗲𝗿𝘀 𝗯𝘆 𝗗𝗲𝗰𝗲𝗺𝗯𝗲𝗿 𝟯𝟭𝘀𝘁. How do I get there? 𝗣𝗮𝗿𝘁𝗻𝗲𝗿…
Liked by Patrick Freeze, Ph.D.
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Just in time for New Years I had fun doing this podcast interview about #soilhealth and #covercrops: https://lnkd.in/enpMcQxa
Just in time for New Years I had fun doing this podcast interview about #soilhealth and #covercrops: https://lnkd.in/enpMcQxa
Liked by Patrick Freeze, Ph.D.
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Happy Birthday, Dr. Nick Ward! 🎂 Here's to another year helping customers succeed, supporting continued education through our #ThursdayThoughts…
Happy Birthday, Dr. Nick Ward! 🎂 Here's to another year helping customers succeed, supporting continued education through our #ThursdayThoughts…
Liked by Patrick Freeze, Ph.D.
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We trust you enjoyed a delightful Christmas celebration! Today, we are excited to announce that our leading blog post of 2024 is our engaging series…
We trust you enjoyed a delightful Christmas celebration! Today, we are excited to announce that our leading blog post of 2024 is our engaging series…
Liked by Patrick Freeze, Ph.D.
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Did you know that the U.S. Regenerative Cotton Fund has knowledgeable Farmer Mentors available for farmers and advisors to consult with – for free?…
Did you know that the U.S. Regenerative Cotton Fund has knowledgeable Farmer Mentors available for farmers and advisors to consult with – for free?…
Liked by Patrick Freeze, Ph.D.
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