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Open AccessArticle

Fertilizer Rate and Substrate Water Content Effect on Growth and Flowering of Beardtongue

Stockbridge School of Agriculture, University of Massachusetts, 210 Bowditch Hall, Amherst, MA 01003, USA
Horticulturae 2020, 6(3), 57; https://doi.org/10.3390/horticulturae6030057
Received: 27 August 2020 / Revised: 10 September 2020 / Accepted: 14 September 2020 / Published: 16 September 2020
(This article belongs to the Section Floriculture, Nursery and Landscape, and Turf)
Research has shown that reduced irrigation and fertilizer rates can still produce good plant growth when irrigation is applied efficiently to reduce leaching. The impact of reduced irrigation and fertilizer rate on flowering and plant growth would provide additional information on the potential for reduced production inputs. The objective of this research was to quantify the impact of reduced irrigation and fertilizer rate on growth and flowering of Ruby Candle beardtongue (Penstemon × ‘Ruby Candle’). A soil moisture sensor automated irrigation system was used to maintain plants at 40% volumetric water content [VWC; well-watered (WW)] or 18% VWC (reduced irrigation, RI). A controlled release fertilizer was applied at 100%, 50%, and 25% of the bag rate (12 g/plant). There was not a significant treatment effect on any flower parameter. Average plant height was greatest for plants receiving the 50% fertilizer rate (75.9 cm) and was lowest for the 100% fertilizer rate (64.5 cm). Internode length was greater for WW plants (36.9 mm) than RI plants (32.4 mm). Well-watered plants had greater fresh weight (99.1 g) than RI plants (79.2 g) and 100% fertilizer rate (97.1 g) was greater than the 25% fertilizer rate (82.7 g). View Full-Text
Keywords: Penstemon; sensor irrigation; reduced irrigation; container production; volumetric water content Penstemon; sensor irrigation; reduced irrigation; container production; volumetric water content
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Bayer, A. Fertilizer Rate and Substrate Water Content Effect on Growth and Flowering of Beardtongue. Horticulturae 2020, 6, 57.

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