Abstract: Plant nutrients are captured by means of cation exchange and are rendered water insoluble and held indefinitely by electrostatic ionic attraction within the confines of the delivery medium, to wit: zeolites substrate. These nutrients are released or accessible upon plant demand, minimizing leaching into surrounding soil or groundwater. A delivery method provides a naturally occurring zeolites substrate. The substrate possesses a valence charge of minus 2 (?2). The substrate is doped with one or a number of chemical agents that through natural cationic exchange allow the substrate to encapsulate and hold by means of electrostatic ionic attraction one or a number of nutrient elements or compounds.