Redefining phosphorus nutrition and deficiency symptomology for floriculture crops grown in soilless substrates

J.B. Henry, I. McCall, B.E. Whipker
With the increased popularity of low phosphorus (P) fertilization strategies, there is a need to redefine P nutrition and optimal P concentrations for plants grown in soilless substrates. In several experiments, maximum growth was achieved for a variety of ornamental species with lower P concentrations than those historically used in floriculture production. It was found that P concentrations between 3 and 5 mg L‑1 P resulted in growth control of these species. Lower P concentrations rapidly led to the development of P deficiency symptoms. These symptoms have typically been described as a foliar reddening of the lower leaves, a darker green coloration, and overall stunting. Other symptoms have recently been identified, including olive-green and necrotic leaf spotting. Descriptions of symptomology and P recommendations for commercial production are presented.
Henry, J.B., McCall, I. and Whipker, B.E. (2019). Redefining phosphorus nutrition and deficiency symptomology for floriculture crops grown in soilless substrates. Acta Hortic. 1266, 345-352
DOI: 10.17660/ActaHortic.2019.1266.48
https://doi.org/10.17660/ActaHortic.2019.1266.48
plant growth, sufficiency ranges, fertilization, tissue analysis
English

Acta Horticulturae