Table 1.
The four LED light factors and their ranges to construct the experimental design.
Table 2.
Four-factor D-optimal quadratic response surface design matrix. PPFD = Photosynthetic Photon Flux Density – a measure of how many photons land in a specific area that the plant can use.
Table 3.
Summary of the experimental setup for the response surface design for winter photoperiod supplementation with LED lighting including A) Plant material & grafting, B) Greenhouse conditions, C) Photoperiod strategy, D) LED spectra & measurement, E) Experimental design, F) Replication & bench layout, G) Responses, and H) Statistical analysis.
Table 4.
ANOVA model terms, p-values (Prob. > F), lack-of-fit, R2, and adequate precision statistics for the effect of light on % budbreak, shoot growth, and scion and rootstock dimeters. Full ANOVA tables and model equations in coded and actual form provided (S2 File).
Table 5.
ANOVA model terms, p-values (Prob. > F), lack-of-fit, R2, and adequate precision statistics for the effect of light on internode length, leaf area, scion biomass, and chlorophyll index. Full ANOVA tables and model equations in coded and actual form provided (S2 File).
Fig 1.
Contour response surface plots for Carrizo rootstock.
Effects of red, blue, white, and far-red LED light spectra on A) Budbreak percentage, B) Scion shoot growth, C) Scion shoot diameter, and D) Rootstock diameter.
Fig 2.
Contour response surface plots for Rich 16−6 rootstock.
Effects of red, blue, white, and far-red LED light spectra on A) Budbreak percentage, B) Scion shoot growth, C) Scion shoot diameter, and D) Rootstock diameter.
Fig 3.
Contour response surface plots for Carrizo rootstock.
Effects of red, blue, white, and far-red LED light spectra on A) Internode length, B) Leaf area, C) Scion dry weight, and D) Chlorophyll index.
Fig 4.
Contour response surface plots for Rich 16−6 rootstock.
Effects of red, blue, white, and far-red LED light spectra on A) Internode length, B) Leaf area, C) Scion dry weight, and D) Chlorophyll index.