John Sawyer
Agronomy

515-294-7078
jsawyer@iastate.edu

Articles by this author:

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.

A two-day short course, Soil Fertility and Nutrient Management, will be held Feb. 13-14 at the Scheman Building on the Iowa State University campus in Ames. The ISU Extension and Outreach short course will focus on principles of soils, soil fertility and nutrient management.