Iowa Fertilizer Dealers Reaffirm Fall Nitrogen Code of Practice

Iowa Fertilizer Dealers Reaffirm Fall Nitrogen Code of Practice

Fertilizer dealers who belong to Agriculture's Clean Water Alliance in Iowa say they won't deliver anhydrous ammonia for fall application until soil temperatures reach specified cool temperatures.

The organization of farm retailers who sell fertilizer in the Raccoon and Des Moines River watersheds, called Agriculture's Clean Water Alliance, has renewed their annual "Fall Nitrogen Code of Practice"--with one change from last year's pledge.

The ACWA Fall Nitrogen Code of Practice is a formal agreement among the retailers that they will not distribute anhydrous ammonia to farmers for fall application until soil temperatures reach 50 degrees F at a depth of 4 inches (or 60 degrees F after Oct. 15 with use of a nitrification inhibitor) with a forecast of cooling soil temperatures.

 The only change made from previous years is the specification to wait until after Oct. 15. By making the stipulation, the members agreed to keep the temperatures by which they operate consistent with what manufacturers recommend, while at the same time decreasing the odds of a soil temperature increase that might happen with earlier application.

You can monitor soil temperatures in your location

On Oct. 8, 2009, soil temperatures across the state ranged from the high 40s to the mid-50 degrees F. To help you keep abreast of soil temperatures in your area, you can go online and view your county's soil temperature map. County-by-county soil temperature maps are available from Iowa State University at

The commitment of ACWA to the Fall Nitrogen Code of Practice has received good reviews from the public, regulators, farmers and dealers alike. ACWA members have held to their commitment in the past, even in the face of unfavorable market conditions, projected equipment shortages in spring, and many other unknowns shared by dealers and their farming customers. The Agribusiness Association of Iowa also adopted the Code of Practice, and ag retailers throughout the state are being encouraged to follow it.

Dave Coppess, vice president of sales and marketing for Heartland Co-op in West Des Moines, is president of ACWA. Coppess says the Code of Practice is one way the industry is working hard to be environmentally proactive. "To be a viable enterprise in the long-term, we are going to have to demonstrate that we operate to the highest environmental performance standards possible. With ACWA, we're on our way to reaching that goal."

ACWA invests in and promotes nutrient management on farms

ACWA invests in and supports water quality monitoring and nutrient management on farms. In the past year ACWA and Sand County Foundation supported installation of five tile-line bioreactors. The purpose of the bioreactor demonstration is to assess bioreactors' effectiveness as a means of reducing nitrates from tile systems.

Coppess says ACWA and its partners — organizations like the Des Moines Water Works and the National Laboratory for Agriculture and the Environment (formerly called the USDA National Soil Tilth Lab) located on campus at Iowa State University, are making significant findings in their monitoring program.

He adds, "We're seeing that, the more we study water quality issues in Iowa, the more we understand that water quality is the result of a very complex system. Examining fall fertilization guidelines is just part of an ongoing evolution in agronomy practices in Iowa. And the more we learn, the more we find that good agronomic performance can be linked to good environmental practices."

Don't go until soil temperature is 50-degrees F or below

ACWA membership consists of leading ag retailers in the Raccoon River and Des Moines River watersheds. The group's mission is to establish reasonable guidelines, and to put them into practice by fertilizer dealers and farmers, for fall nitrogen fertilization to reduce nitrate loss from farm fields entering the Des Moines and Raccoon River and connecting tributaries.

Iowa State University observations show soil temperatures below 50 degrees F on varying dates during the past few years:

• 2008 — Nov. 7

• 2007 — Nov. 1

• 2006 — Nov. 29

• 2005 — Nov. 14

• 2004 — Nov. 21

• 2003 — Oct. 28 (with periods of warming until Nov. 21)

• 2002 — Oct. 22

• 2001 — Nov. 21

• 2000 — Nov. 3


To contact an ACWA member locally, call:

Albert City — Ag Partners, LLC — Troy Upah | 712-843-2291

Cherokee — First Co-op Association — Jim Carlson | 712-225-5400

Dedham — Dedham Cooperative Association — Roger Shaw | 712-683-5515

Farnhamville — Farmers Cooperative — Roger Koppen | 515-817-2100

Fort Dodge — New Co-op, Inc. — Brent Bunte | 515-955-2040

Gilmore City — Pro Co-op — Jim Day | 515-373-6532

Ralston — West Central — Harry Ahrenholtz | 712-667-3200

Webster City — Van Diest Supply — John Van Diest | 800-779-2424

West Des Moines — Heartland Co-op — Dave Coppess | 515-225-1334

Goldfield — Gold-Eagle Cooperative — Stu Pannkuk | 515-825-3732

Wall Lake — UAP — Duane Petersen | 712-664-2444

West Des Moines — Helena Chemical Co. — John McKinney | 515-309-3461

Roland — Heart of Iowa Coop — Jim Penney | 515-388-4341

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