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Original Articles

Release Rates of Ammonium‐Nitrogen, Nitrate‐Nitrogen, Phosphorus, Potassium, Magnesium, Iron, and Manganese from Seven Controlled‐Release Fertilizers

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Pages 843-850 | Received 30 Jul 2005, Accepted 16 Mar 2006, Published online: 24 Apr 2007
 

Abstract

Samples of seven controlled‐release fertilizers, Nutricote Total 13–13–13, Nutricote Total 18–6–8, Osmocote Plus 15–9–12, Osmocote 13–13–13, Polyon 18–6–12, Polyon 14–14–14, and Plantacote 14–8–15, were placed in leaching columns containing acid‐washed sand. Samples of all leachates were analyzed weekly to determine release rates of ammonium‐nitrogen (N), nitrate‐N, phosphorus (P), potassium (K), magnesium (Mg), manganese (Mn), and iron (Fe). Release rates for P from all products were slower than those for NH4‐N, NO3‐N, and K. Release of Mg, Mn, and Fe was very poor, with less than 50% of the total amount of each of these elements ever being released from the prills for some products. Nutricote products released Fe and Mn more effectively than did Osmocote or Plantacote.

Acknowledgments

Florida Agricultural Experiment Station Journal Series No. R‐11008. The authors thank Anita Durden, Luci Fisher, and Susan Thor for their assistance in this study.

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