The Four Rs of Fertilizer Management
Bold green letters spelling out the 4 R's: right rate, right source, right placement, right timing
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How to Cite

Hochmuth, George, Rao Mylavarapu, and Ed Hanlon. 2014. “The Four Rs of Fertilizer Management: SL411/SS624, 10/2014”. EDIS 2014 (8). Gainesville, FL.


Supplying needed nutrients for crop production involves attention to four major fertilization factors (the 4Rs): right rate, right source, right placement, and right timing. Attention to these factors will provide adequate nutrition for crop production while minimizing the risk of loss of nutrients to the environment. In this publication each factor is described, as well as how the information can be provided from a soil test report. While not a formal part of the 4Rs, the importance of irrigation to overall nutrient management is stressed in this 4-page fact sheet written by George Hochmuth, Rao Mylavarapu, and Ed Hanlon, and published by the UF Department of Soil and Water Science, October 2014.

SL411/SS624: The Four Rs of Fertilizer Management (
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International Plant Nutrition Institute. 2014.

Prasad, R., and G. Hochmuth. 2014. How to Calculate a Partial Nitrogen Mass Budget for Potato. Gainesville: University of Florida Institute of Food and Agricultural Sciences.