DAVENPORT_JOANJoin us on Wednesday, Nov 16th, for the next seminar in our IAREC Seminar Series. Dr. Joan Davenport will be presenting a seminar titled, “Phosphorus: From the Soil Scientist’s Perspective”.

Dr. Joan Davenport is a Professor of Soil Science in the Department of Crop & Soil Sciences. She received her Ph.D. in Soil Chemistry from University of Guelph, Ontario, Canada. Her research is designed to understand soil variability and how to manage water and nutrients for economically sustainable, environmentally friendly agricultural production, with a primary emphasis on perennial fruit crops.



Phosphorus is one of three soil derived plant macronutrients. It plays a number of roles in the plant, including energy relations and as part of plant genetic material.  In the soil, inorganic phosphorus chemistry is highly complex and often limits the plant’s ability to access this nutrient.  Phosphorus (P) is also present in the soil in organic forms and in the past several decades has been discovered to behave very differently from our historic understanding of inorganic phosphorus.

Internationally, demand for P fertilizers has been increasing with time. However, inorganic mineral P resources are limited.  Animal waste byproducts (e.g., manures) are often high in P but behave very differently than mineral P sources.  This is further coupled with environmental concerns since, when over applied and/or mismanaged, off target movement of P can result in surface water eutrophication.

This presentation will provide a broad background about this plant macronutrient and discuss some of the opportunities and concerns for P management in agroecosystems.

Seminar Announcement