Abstract: This study evaluated the effect of different fertilization levels (nitrogen, potassium, and calcium) on the growth and nutrient absorption of roselle (Hibiscus sabdariffa) at the Santa Inés Experimental Farm of the Technical University of Machala. A completely randomized block design was implemented with four treatments (0%, 100%, 150%, and 200% of the recommended dose) and four replications. Growth variables and nutrient concentrations in different plant organs were analyzed through total extraction in the laboratory. Results showed fertilization effects, mainly during the third phenological stage, where the 200% dose maximized parameters such as plant height, stem diameter, and flower bud production. The 150% dose was more effective for NO3- extraction in petioles and leaves, while the 200% dose optimized NH4+ and K+ extraction in stems and fruits. However, doses higher than 100% showed no significant benefits during early phenological stages and, in some cases, reduced nutrient absorption efficiency. Fertilization doses must be precisely adjusted to maximize nutrient uptake without causing excessive fertilization, which could negatively affect the crop’s efficiency and sustainability.
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