Research Scientist at CSU. SOM biogeochemistry. Agricultural sustainability. Bikes. Books. MT|KY|CO|CHI (he/him)
Chicago, IL
Joined June 2018
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Hey Twitter- I'm getting close to wrapping things up! I'll be defending my PhD work on June 20th, at 9 AM MT. I'll talk about SOM fractionation methods, MAOM nitrogen, yield stability, PyOM persistence, and everything in between.
Hope y'all can tune in-- DM me for a Teams link!
Terrible, stupid news.
nytimes.com/2026/04/03/clima… via @NYTimes
We had a new paper out last week: doi.org/10.1007/s00374-025-0…
We show that, under lab conditions, MAOM can contribute a significant amount of N to the inorganic N pool (up to ~75% of the total!). This proportion was moderated by the POM:MAOM and the POM C:N ratio.
An important point is that POM was still more accessible (a greater proportion of the original POM-N was mineralized), there's just a lot of MAOM-N in most soils. That balance determines the make-up of the mineral N pool.
Sam retweeted
Excited to share our new Policy Analysis in the @SciPolJournal Winter Issue! With Helen Silver, @MeganMachmuller & Dr. Jane Zelikova, we explore how diversified ag systems impact soil carbon, soil health & yields.
🌱📈
Read it here 👉 sciencepolicyjournal.org/art…
Hot off the press!
#JSPG Volume 26, Issue 1 is LIVE.
12 open-access papers tackle climate resilience, digital infrastructure, health equity & national competitiveness.
Read now ➡️ bit.ly/JSPGVol26Iss01
#SciPol #OpenAccess #SciencePolicy
Very excited to have this out (and in Nature Geoscience, no less!).
We returned to in-field incubations of isotopically enriched litter and pyrogenic OM ten years after inception, and were able to glean some insights into the persistence patterns of the SOM that was formed.
Article: Decadal persistence of grassland soil organic matter derived from litter and pyrogenic inputs
@samleuthold @jso_soong @csuagsci
nature.com/articles/s41561-0…
There's a lot more to this paper, and I encourage you to check it out if you're thinking about formation and persistence of POM and MAOM.
I feel very grateful to have gotten to work on it -- a special thank you to @jso_soong, @KonzaLTER, and @USDA_NIFA for making it possible.
P.S. -- Here's an open access link: rdcu.be/d7lLP
Feel free to DM/email me with any questions or if you want to pdf copy!
Sam retweeted
So glad #MFCotrufoNeedsTwitter is an #AGU2024 fellow this year! She is an outstanding scientist and truly caring mentor. She is so deserving and I am so grateful to have been trained by her 👩🏻🔬
Sam retweeted
Congratulations to Fernando E. Miguez & Hanna Poffenbarger for the 2024 A&EL Outstanding Research Letter! How can we estimate optimum fertilizer rates with accuracy and precision? doi.org/10.1002/ael2.20075
@FernandoMiguez1 @hpoffenb @isuagronomy @UKAgriculture #OpenAccess
ALT Fernando E. Miguez
ALT Hanna Poffenbarger