It’s only been since 1988 that the International Plant Nutrition Institute has credited the 4R framework—application of the right nutrient source or product at the right rate, right time and in the right place—as having a close tie and application to agricultural sustainability. The 4Rs are millennials, and we are seeing a generation’s worth of change in today’s fertilizer products.
 
Of course, product development, environmental stewardship and crop yields have dynamically changed in 35 years. So what about fertilizer? Here’s an overview of some developments that have changed products to be not your father’s fertilizer.
 
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