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ARS Home » Midwest Area » Columbia, Missouri » Cropping Systems and Water Quality Research » Research » Publications at this Location » Publication #390230

Research Project: Long-term Management of Water Resources in the Central Mississippi River Basin

Location: Cropping Systems and Water Quality Research

Title: Quantifying how much, where, and what form of legacy P across scales: the case of Illinois

item MARGENOT, ANDREW - University Of Illinois
item SADEGHPOUR, AMIR - Southern Illinois University
item CHRISTIANSON, REID - University Of Illinois
item ROTHMAN, MAIA - University Of Illinois
item ZHOU, SHENGNAN - University Of Illinois
item ZANDVAKILI, OMID - Southern Illinois University
item GU, CHUNHAO - University Of Delaware
item Abendroth, Lori
item NAKAYAMA, YUHEI - University Of Illinois
item CHIGHLADZE, GIORGI - Iowa State University
item DOUGLASS, MICHAEL - University Of Illinois
item LI, CHONGYANG - University Of Illinois

Submitted to: World Congress of Soil Science
Publication Type: Abstract Only
Publication Acceptance Date: 11/30/2021
Publication Date: 7/31/2022
Citation: Margenot, A., Sadeghpour, A., Christianson, R., Rothman, M., Zhou, S., Zandvakili, O., Gu, C., Abendroth, L.J., Nakayama, Y., Chighladze, G., Douglass, M., Li, C. 2022. Quantifying how much, where, and what form of legacy P across scales: the case of Illinois [abstract]. 22nd World Congress of Soil Science. July 31-August5, 2022. Glasgow, Scotland.

Interpretive Summary:

Technical Abstract: The spatial distribution, magnitude and speciation of legacy P are challenging to quantify, complicating its management (e.g., drawdown). We demonstrate a multifaceted approach to quantify where, how much, and what type of legacy P at varying spatial scales (10 cm to 1000 km) that stands to inform legacy P utilization. We draw upon agronomic P balances, soil testing trends, long-term (145 year) field experiments, and historical soil archives in the U.S. state of Illinois, which has undergone drastic acceleration P fluxes driven by agricultural intensification in less than two centuries. Combining multiple approaches to the spatial distribution and magnitude of legacy P identifies shortcomings of single-approach methods and demonstrates their complementarity. Quantifying native soil P stocks and utilizing chronosequence approaches provides much-needed baseline measurements, which cannot be obtained by typical short-term P balances, to better quantify legacy P magnitudes and speciation. Observed P speciation by XANES and sequential fractionations in soils with net P surpluses as well as deficits is consistent with hypothesized transformations of historical P inputs. Untangling the anthropogenic and edaphoclimatic interactions can help determine where and how to best utilize historically accumulated soil P.