4R Nutrient Stewardship

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The Role of Sulfur in Meeting 4R Nutrient Stewardship Goals

May 1, 2024

The magnesium cycle.

4R Nutrient Management for Magnesium

January 7, 2024

Figure 1. Fertilizer fates. Adapted from Alan Blaylock, Nutrien eKonomics.

Integrating Enhanced-Efficiency Fertilizers in 4R Nutrient Management

January 1, 2024

Figure 1. The optimal potassium rate in corn with a quadratic plateau model (y = a + bx + cx2 ).

Big Data and Machine Learning: What Is It and Can We Use It for 4R Nutrient Management?

July 19, 2023

Figure 1. The potassium nutrient cycle, showing the major pools and flows of K in the soil–crop system (Source: Mikkelsen & Roberts, 2021).

Assessing Soil Potassium: Basic Principles and New Developments

March 7, 2023

From 2013 through 2022, the 4R Research Fund provided around $8 million to support 39 projects. Stars indicate projects ongoing.

4R Research With Impact

January 16, 2023

Certified Crop Adviser Exam Registration

Certified Crop Adviser Exam Study Tools & Resources