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United States Department of Agriculture

Agricultural Research Service

Research Project: NUTRIENT CYCLING AND UTILIZATION ON ORGANIC DAIRY FARMS

Location: New England Plant, Soil and Water Research Laboratory

Title: Effects of Phosphorus on Morphology of Hydroponically Grown Scaevola aemula R. Br. "Whirlwind Blue"

Authors
item Burnett, Stephanie - UNIVERSITY OF MAINE
item Zhang, Donglin - UNIVERSITY OF MAINE
item Stack, Lois - UNIVERSITY OF MAINE
item He, Zhongqi

Submitted to: American Society of Horticulture Science Meeting
Publication Type: Abstract Only
Publication Acceptance Date: April 11, 2007
Publication Date: July 16, 2007
Citation: Burnett, S.E., Zhang, D., Stack, L.B., He, Z. 2007. Effects of Phosphorus on Morphology of Hydroponically Grown Scaevola aemula R. Br. "Whirlwind Blue". American Society of Horticulture Science Meeting. HortScience, Vol 42 page 874

Technical Abstract: The popular hanging basket plant, fan-flower (Scaevola aemula R. Br. ‘Whirlwind Blue’), is cultivated from low phosphorus soils and requires minimal supplemental phosphorus. To accurately evaluate the effects of phosphorus on morphology, fan-flower was grown hydroponically in order to maintain concentrations of all nutrients except phosphorus at equal levels. The nutrients were supplied in half-strength Hoagland solutions containing 0, 20, 40, 60, or 80 mg/L of phosphorus and 134 mg/L of nitrogen. Plants grown with 0, 60, or 80 mg/L had significantly fewer flower branches and total flowers when considered marketable, than those grown at 20-40 mg/L. Plants grown with 20-60 mg/L of phosphorus had the longest branches; however, plants grown with 0 mg/L of phosphorus had roots 40-54% longer than those grown at all other concentrations. Little new root growth was observed in fan-flower grown at the highest phosphorus concentration. Furthermore, foliage from these plants was chlorotic to nearly white. Results indicate that phosphorus concentrations higher than 40 mg/L reduced growth, flower number, and thus quality of fan-flower. Growers should avoid applying fertilizers with high phosphorus concentrations to these plants.

Last Modified: 9/23/2014
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