Statewide and Region Phosphorus Nutrient Use in Ohio

By Greg LaBarge, CPAg/CCA, OSU Extension Field Specialist, Agronomic Crops, Adapted from C.O.R.N. 2024-02

Soil available and added phosphorus (P) nutrient impacts Ohio’s crop production and environment. Fertilizer P can increase crop yields. Yet, excessive P can have negative impacts on water quality, resulting in toxic algal blooms. To properly calibrate the use of P for maximum crop yield efficiency and environmental safety, it is important to monitor P use trends, understand the changes to P recommendations from 1995 to today, review changes in soil test phosphorus (STP), and identify the sources of P used. Two recent factsheets examine P nutrient use at two scales: statewide and regional. The regional results were summarized by Crop Reporting Districts (CRD). The two publications and their links are Phosphorus (P) Nutrient Use in Ohio ANR-0143, found at, and Ohio Phosphorus (P) Use by Crop Reporting District ANR-0144, found at

These two reviews of P use reveal several trends impacting agronomic management and environmental outcomes: Ohio purchased P fertilizer use is trending downward. During the highest use period (1993–1997), 206,000 tons of P2O5 were applied annually. In the most recent period (2018–2022), annual applications averaged 137,000 tons. Agriculture reduced the average yearly P2O5 application by 33% between the two periods.

All nine Ohio crop reporting districts (CRDs) show a declining trend in P2O5 usage from 1994 to 2022. The reduction rate ranges from 50 to 868 tons annually.

Seven of nine Ohio CRDs show increased availability of P2O5 sourced from manure. CRD 30 and 80 show a decline. The 2017–2022 average annual increase in manure P2O5 is 28 to 355 tons for the seven districts with an increase.

Ohio Crop Reporting Districts designated by NASS and major watersheds.

Sixty-five percent of Ohio counties had decreasing trends in mean soil test P (STP) levels between 1993 and 2015. Since 2003, Ohio’s P2O5 removal through crop harvest has exceeded P applied as a nutrient, resulting in a net annual removal of 8 pounds of P2O5 per acre. Continued net removal would indicate that STP should continue trending downward, which has positive environmental impacts.

The P2O5 mass balance of applied nutrients through fertilizer and manure applications minus nutrients removed through crop harvest ranges from -14 to 1 pound per acre in Ohio’s nine CRDs.

P fertilizer recommendations developed in 1995 were modified, resulting in the reduced application of P fertilizer while still meeting crop production needs. Tri-state fertilizer recommendations were validated and re-released without significant changes for P use in a 2020 publication, Ohio State University Extension Bulletin 974 Tri-State Fertilizer Recommendations for Corn, Soybean, Wheat, and Alfalfa (Culman, et al., 2020).

Environmental Implications of CRD Data


More from this stream


Neobank Mercury launches personal banking services tailored for startups and entrepreneurs.

Attention, founders: Mercury wants to move into your personal orbit. The neobank designed for startups announced on Wednesday that it will open up its services for personal banking use for the first...

‘OTTera Forms Strategic Partnership with Personalization Tech Company Spideo’

OTTera, a Los Angeles-based company that provides tools for companies to...

“Texas Corporation Acquires Engineering Firm in Southwest Florida”

A Texas engineering and consulting services company has acquired GradyMinor, a civil engineering firm with two Southwest Florida offices and 75 employees. San Antonio-based Pape-Dawson Engineers is......

Celebrate the Earth in April with Brochu Walker

April is officially Earth Month, and what better to mark the month than with the super-chic, conscious luxury brand, Brochu Walker? Here’s the low-down on this...

CEO Discusses Q1 Results: Strong Performance with 16% Increase in Net Income

Article 0 Comments The Travelers Companies, Inc. today reported first quarter net income of $1.123 billion, up 16% compared to $975 million in the prior year quarter. Core income in the current...

Choosing the Best CFO Executive Search Firm for Your Business

If the past year has taught us anything, it’s that leadership matters. This is especially true among companies in the Digital Health, Life Sciences, FinTech, and Software & Technology sectors with the myriad challenges and opportunities presented by the pandemic. Whether you are bolstering your C-suite to support continued success and growth or seeking executives […]

The post Selecting the Right CFO Executive Search Firm for Your Company appeared first on Insights Success.