Though soybean yield has continued to increase over recent decades, Illinois’ recommendations on P management for soybean are outdated, with fertilizer often applied only at the start of the two-year corn-soybean rotation. Updating recommendations on the 4Rs (right source, rate, timing, and placement) of P fertilization for soybean will help expand toolbox for farmers to maintain yield while minimizing environmental impacts.

Yuhei Nakayama, Ph.D. student in the Department of Crop Sciences at the University of Illinois at Urbana-Champaign, presented at the Bloomington Better Beans event on January 11, 2023.

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About the Author: Stephanie Porter

As Outreach Agronomist for the Illinois Soybean Association (ISA), Stephanie supports research efforts and helps communicate both in-field and edge-of-field research and validation studies to Illinois 43,000 soybean farmers. She also helps lead the demonstration and adoption of conservation agriculture practices and raises awareness of best management and continuous improvement practices for conservation agriculture in Illinois. Stephanie has 23 years of experience that consists of agronomy, conservation, horticulture, plant diagnostics, and education. She has her bachelor’s in crop science and master’s in plant pathology from the University of Illinois. Stephanie is a Certified Crop Advisor and was named the 2018 Illinois Certified Crop Adviser Master Soybean Advisor. She also has experience with corn and soybean pathology research, crop scouting, soil testing, as well as crop consulting. Previously, she utilized her diagnostic training and collaborated with University of Illinois departmental Extension Specialists to diagnose plant health problems and prepare written responses describing the diagnosis and management recommendations as the University of Illinois Plant Clinic.

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