increasing organic fertilization rate, whereas in 2014, both before and after storage, SSC had a quadratic response with lowest values at 60 and 120 kg·ha −1 N. Across fertilization rates, bulb SSC decreased after storage in 2013 but not in 2014. Fig. 3
with 40 shoots/m and unthinned treatments. There was a year and shoot thinning interaction on berry skin tannin concentration. The tannin concentration was highest in 2011 with the unthinned treatment. In both years, there was a quadratic trend response
analyzed using the General Linear Model and Regression Procedures from SAS (SAS version 9.4; SAS Institute Inc., Cary, NC). The linear models chosen (linear or quadratic) were those with the highest R 2 and lowest P values. A segmented-linear regression
response of hardwood cuttings to IBA concentrations was quadratic. For ‘O’Neal’, ‘Diana’, ‘Coville’, and ‘Biloxi’, RP first decreased, then increased, and then decreased again with increasing IBA concentrations; the highest RP was obtained at 2000 ppm IBA
related to the amount of P applied. Vertical bars represent the standard error of the means. The accumulated vegetative growth showed a quadratic response to P application ( R 2 = 0.98 for Expt. 1 and R 2 = 0.90 for Expt. 2), indicating a reduction in
’/‘Dinero’, ‘Proteo’/‘Jador’, ‘Proteo’/‘P360’, and ‘Proteo’/‘PS1313’) increased linearly and quadratically in response to an increase of the N concentration in the nutrient solution, respectively (N × G interaction, data not shown). Increasing the N concentration in
quality index ( Sun et al., 2020 ) of vegetable seedlings. Most studies investigated the influence of PPFD or photoperiod on growth and quality of seedlings; however, PPFD and photoperiod independently cannot reflect the plant responses to light ( Kelly et
treatments were conducted using Tukey's honestly significant difference test at P < 0.05. Plant response to each fertilizer type was evaluated using linear and quadratic polynomial contrasts based on the fertilizer rate in the substrate. Results
marigold) continued to increase as DLIs reached 43 mol·m −2 ·d −1 ( Faust et al., 2005 ). Plant genotype determines the plasticity of the response to increased DLI ( Lambers et al., 2008 ). When exposed to high light, the sun-adapted plant Phaseolus
D ( P = 0.26 and 0.06, respectively) and W ( P = 0.05 and 0.36, respectively), responses to irrigated volume were pooled for both years and all drip tapes. Depth response to volume of irrigated water was quadratic and described as D = 5.34 + 0