Maximizing Cannabinoid and Polyphenol Extraction from Industrial Hemp (<i>Cannabis sativa</i> L. cv. Helena) Areal Parts: A Comparative Study of Ultrasound-Assisted and Conventional Methods at Two Harvest Stages.

Although R2 in the designed experiment was not high (close to 1), the mathematical models were statistically acceptable due to the highly significant regression for the model (pm < 0.05) and non-significant lack-of-fit ( p > 0.05), meaning the dispersion of experimental data was a model-independent measure of pure error.

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