Author: Paul Fixen. Published in Agronomy Journal
In the last decade, awareness and use of the concept of 4R Nutrient Stewardship has increased dramatically among practitioners and researchers focused on nutrient management. The term “4R” refers to use of the right source, right rate, right time, and right place in nutrient management. These four factors have been recognized as the major pillars of nutrient best management practices for at least 30 years. However, the global framework is a recent development. It evolved through multiple versions over the last decade in a multi‐sector collaborative effort to create a science‐based concept to guide all involved in nutrient management practice, research, and communication. However, evidence‐based 4R largely remains under development…