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Chinese hibiscus (Hibiscus rosa-chinensis), shooting star (Pseuderanthemum laxifl orum), downy jasmine (Jasminum multifl orum), areca palm (Dypsis lutescens), and ‘Jetty’ spathiphyllum (Spathiphyllum) were grown in containers using Osmocote Plus 15–9–12 (15N–3.9P–10K), which provided phosphorus (two experiments), or resin-coated urea plus sulfur-coated potassium sulfate, which provided no phosphorus (one experiment). Plants were treated with water drenches (controls), drenches with metalaxyl fungicide only, drenches with phosphoric acid (PO4-P), drenches with metalaxyl plus phosphorus from phosphoric acid, drenches with PhytoFos 4–28–10 [4N–12.2P–8.3K, a fertilizer containing phosphorous acid (PO3-P), a known fungicidal compound], or a foliar spray with PhytoFos 4–28–10. Plants receiving soil drenches with equivalent amounts of P from PhytoFos 4–28–10, PO4-P, or PO4-P+metalaxyl generally had the greatest shoot and root dry weights and foliar PO4-P concentrations. There were no differences between the control and metalaxyl-treated plants, indicating that root rot diseases were not a factor. Therefore, responses from PhytoFos 4–28–10 were believed to be due to its nutrient content, rather than its fungicidal properties. Foliar-applied PhytoFos 4–29–10 produced plants that were generally similar in size to control plants or those receiving metalaxyl only drenches. Fertilizers containing PO3-P appear to be about as effective as PO4-P sources when applied to the soil, but are relatively ineffective as a P source when applied as a foliar spray. A distinct positive synergistic response for shoot and root dry weights and foliar PO4-P concentrations was observed for the PO4-P+metalaxyl treatment when no P was applied except as a treatment.

Effects of Phosphorous and Phosphoric Acids on Growth and Phosphorus Concentrations in Container-grown Tropical Ornamental Plants