Soils
Soil Fertility
The Iowa State University soil fertility web page is a complete resource for extension and research information on soil fertility and nutrient management topics. Simply click on a nutrient topic of interest and you can find information about that topic, including extension publications, newsletter articles, conference proceedings and reports, presentations, photos, and links to related online sites. In addition, there are links to online tools such as the Corn Nitrogen Rate Calculator and online sites with additional soil fertility information such as the Compendium of Nontraditional materials and the North Central Extension-Industry Soil Fertility Conference Proceedings. Contact information is there for Iowa State University soil fertility extension and research specialists.