John Sawyer
Agronomy

515-294-7078
jsawyer@iastate.edu

Articles by this author:

To explain how to take good soil samples, Iowa State University Extension and Outreach has released a new publication, "Take a Good Soil Sample to Help Make Good Fertilization Decisions."

Iowa State University Extension and Outreach will offer a two-day short course Feb. 8-9 focusing on principles of soils, soil fertility and nutrient management to help crop production professionals make more informed decisions.

Farmers are reminded to wait until soil temperatures remain below 50 degrees Fahrenheit before applying anhydrous ammonia (NH3) fertilizer this fall.

Based on current research results from Iowa and neighboring states, the Using Manure Nutrients for Crop Production was recently updated to reflect new manure nutrient availability ranges for crop production.

The regional Corn Nitrogen Rate Calculator website, which has been helping farmers determine profitable nitrogen rates since 2005, now has a new URL, a revised nitrogen response trial database, and is more user-friendly for mobile devices.

Farmers are reminded to wait until soil temperatures remain below 50 degrees Fahrenheit before applying anhydrous ammonia (NH3) fertilizer this fall. Harvest is progressing rapidly in many parts of the state and officials with the Iowa Department of Agriculture and Land Stewardship and Iowa State University Extension and Outreach said that waiting can help reduce nitrogen loss and better protects the environment.

The publication, Nitrogen Use in Iowa Corn Production, provides an overview of nitrogen use in regard to the soil system and corn fertilization.

Sulfur Management for Iowa Crop Production, a new Iowa State University Extension and Outreach publication, provides a summary of research efforts and guidance on sulfur fertilization and application needs.

Iowa State University Extension and Outreach will offer a two-day crop production short course Feb. 18-19 focusing on principles of soils, soil fertility and nutrient management. Registration is limited to 40 participants; pre-registration is required and must be made by Feb. 11.

Advances in soil-testing research has led Iowa State University Extension agronomists to revise recommendations for phosphorus, potassium and lime.