Applying the right nutrient source, at the right rate, at the right time, in the right place is essential to nutrient stewardship and is the core of the 4Rs. To achieve this goal, a team of experts has created the following learning modules. An essential component of these learning modules is to provide information about the basic components of soil fertility and nutrient best management practices. Topics include an explanation of the key components of plant nutrition in relation to selection of fertilizer best management practices addressing the 4Rs. The modules address the macro- and micronutrients as well as soil sampling and integrated economic and environmental issues relative to nutrient management.
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The materials included in these modules were authored by Agustin Pagani, John Sawyer, and Antonio Mallarino; Iowa State University Department of Agronomy. Materials include a chapter and an automated presentation for each topic.