Evaluation of the Steiner nutrient solution applied to the cultivation of medical hemp flower (Cannabis sativa L.) var. Cherry Oregon, under greenhouse
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Proper nutritional management is crucial for the development and production of cannabinoids in the cultivation of Cannabis sativa var. Cherry Oregon. The objective of this research was to evaluate the effect of five concentrations of Steiner nutrient solution on the phenology of medicinal hemp, and to determine the optimal dosage of the nutrient solution for cannabinoid content (cannabidiol [CBD] and tetrahydrocannabinol [THC]). Research was conducted at the Instituto Nacional de Investigaciones Agropecuarias [INIAP], Estación Experimental Santa Catalina [EESC], in Ecuador, under greenhouse conditions. Five concentrations of Steiner nutrient solution (50, 75, 100, 125 and 150%). Agronomic variables such as plant height, diameter at collar height, yield, and cannabinoid content in flowers were evaluated. Significant effects (p > 0,05) were used. Agronomic variables such as plant height, diameter at neck height, yield, and cannabinoid content in flowers were evaluated. Significant effects (p > 0.05) were observed in plant height and diameter at neck height. Tetrahydrocannabinol (THC) remained at concentrations lower than 1%. Concentrations at 75% and 100% of the nutrient solution showed higher levels of cannabidiol (CBD) with 15,3% and 15,15%, respectively. The nutrient solution at 125% and 100% concentrations promoted greater growth in plant height and diameter. The 125% concentration also produced the highest dry biomass yield with 810 g m-2 or 8,1 t ha-1, surpassing the other concentrations. It is concluded that the optimal concentration of Steiner solution was 125% for accumulation of dry biomass, and 75 and 100% for cannabinoid production in flowers (CBD), complying with current regulations (< 1% THC).
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