In this special re-run episode of The Crop Science Podcast Show, we bring back our conversation with Dr. John Jones from the University of Illinois Urbana-Champaign, who explains how phosphorus and potassium recommendations are developed and why nutrient test methods vary by region. He explores nutrient behavior in soils, calibration approaches, and how agronomists can make better data-driven fertilizer decisions. Learn how to fine-tune your nutrient management strategies and why accurate soil testing matters. Listen now on all major platforms!

"We treat phosphorus and potassium as more immobile nutrients that remain in the soil for years or even decades, which makes soil testing a reliable tool for guiding fertilization decisions."

Meet the guest: Dr. John Jones is an Assistant Professor of Agronomy and Soil Fertility Extension Specialist at the University of Illinois Urbana Champaign. His work focuses on soil fertility, nutrient management, and water quality, with experience across major cropping systems. His research connects soil testing, nutrient cycling, and practical agronomic decisions to improve crop production.

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What you will learn:

• (00:00) Highlight
• (00:51) Introduction
• (02:05) Guest background
• (05:38) P and K calibration
• (08:26) Nutrient interaction effects
• (13:20) Regional test differences
• (18:51) Data-driven decisions
• (24:16) Final three questions

The Crop Science Podcast Show is trusted and supported by innovative companies like:

- Loam Bio

- KWS

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