Work

Carryover Potassium

Year: 2026

Type: article

Abstract: Optimal potassium (K) management requires considering fertilizer-K carryover. To offer general K management guidelines, we estimate summary carryover functions using meta-analysis, integrating them with estimates using data in USDA Ag Data Commons. Using dynamic programming we demonstrate that accounting for carryover increases fertilizer-K recommendations and profitability. Fertilizer-K carryover is estimated at roughly 20–30%. Considering carryover is much like reducing the effective price of K in the current year, ignoring it underestimates fertilizer-K recommendations. Since soil-K reserves may slowly supply or retain K but are not captured by routine soil testing, the true optimal fertilizer-K rate may be even higher.

Source: Journal of Agricultural and Applied Economics

DOI: 10.1017/aae.2026.10061

Authors: Whoi Cho, B. Wade Brorsen, Michael P. Popp, Nathan A. Slaton

Institutions: South Dakota State University, Oklahoma State University, University of Arkansas at Fayetteville

Language: English

Topic: Agricultural Science and Fertilization

Subfield: Soil Science

Field: Agricultural and Biological Sciences

Domain: Life Sciences

Open Access status: gold

Estimated APC paid: $2,660

OpenAlex ID: W7225624333

FWCI:

Cites: 33

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