WEBINARS
Josh Henry, graduate student at North Carolina State University shares the findings of his master’s research investigating low phosphorus fertilization of floriculture crops. In part one of this three-part presentation, Josh discusses the effects of phosphorus fertilization rate on plant growth. This research is tailored to the production of herbaceous annual crops grown in typical peat-based potting substrates. Due to the low phosphorus holding capacity of these soilless substrates, fertility recommendations are different from those for plants grown in-ground or in substrates amended with clays or mineral soils. The methods and results of these experiments are discussed, and phosphorus recommendations are given for several different floriculture species. These recommendations can help you to produce compact, healthy containerized crops while limiting environmental contamination from excess phosphorus fertilization.
Josh Henry, graduate student at North Carolina State University shares the findings of his master’s research investigating low phosphorus fertilization of floriculture crops. In part two of this three-part presentation, Josh discusses the effects of low phosphorus fertilization on plant leaf coloration. This research demonstrated that you can enhance leaf color in plants with red or purple leaf coloration by limiting the rate of phosphorus in your fertility program. Red and purple foliage color is enhanced due to the increase in red plant pigments such as anthocyanins and betacyanins. Some of the species discussed in this presentation include Joseph’s coat (Alternanthera sp.), zonal geraniums (Pelargonium xhortorum), and red-leaf lettuce (Lactuca sativa). These recommendations can help you to produce vibrant, healthy containerized crops while limiting environmental contamination from excess phosphorus fertilization.
Josh Henry, graduate student at North Carolina State University shares the findings of his master’s research investigating low phosphorus fertilization of floriculture crops. In part three of this three-part presentation, Josh discusses symptoms of a reproductive stage phosphorus deficiency that occur on the upper foliage of plants with developing flowers or fruit. Phosphorus deficiency symptoms typically develop on the lower foliage, and these upper leaf symptoms had not previously been associated with a phosphorus deficiency. These unusual symptoms occur when plants are supplied with a low but sufficient rate of phosphorus for the first half of the production cycle, followed by a period of limited phosphorus during reproduction. These specific conditions lead to competition between two sinks: the flowers/fruit and the upper leaves. In this scenario, the limited phosphorus bypasses the upper foliage in favor of the reproductive tissues, ultimately resulting in this upper leaf symptomology. The results and recommendations determined from this research can help you to successfully implement a low phosphorus fertilization program while avoiding these devastating symptoms.
Josh Henry, graduate student at North Carolina State University shares the findings of his master’s research investigating low phosphorus fertilization of floriculture crops. In part three of this three-part presentation, Josh discusses symptoms of a reproductive stage phosphorus deficiency that occur on the upper foliage of plants with developing flowers or fruit. Phosphorus deficiency symptoms typically develop on the lower foliage, and these upper leaf symptoms had not previously been associated with a phosphorus deficiency. These unusual symptoms occur when plants are supplied with a low but sufficient rate of phosphorus for the first half of the production cycle, followed by a period of limited phosphorus during reproduction. These specific conditions lead to competition between two sinks: the flowers/fruit and the upper leaves. In this scenario, the limited phosphorus bypasses the upper foliage in favor of the reproductive tissues, ultimately resulting in this upper leaf symptomology. The results and recommendations determined from this research can help you to successfully implement a low phosphorus fertilization program while avoiding these devastating symptoms.
Many growers are applying far more phosphorus than is needed for floriculture crop production. Recent research has led to lower phosphorus rate recommendations, which has also introduced new challenges when rates drop too low. Josh Henry of North Carolina State University provides you with the information you need to produce healthy and compact ornamentals by optimizing your fertilization strategy.
A review of current phosphorus (P) fertilization practices are discussed In this e-GRO Plant Nutrition Webinar recording. Currently growers are supplying more P than what plants require. Optimal levels of P, fertilizer sources, P deficiencies and toxicities, as well as management practices are provided.
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This time-lapse video was created by Nathan Jahnke, Josh Henry, Ingram McCall, and John Dole. The video illustrates the entire 2017 poinsettia growing season at North Carolina State University.