Dominican oregano is a traditional seasoning leaf in Caribbean cuisine. However, little information is available regarding its mineral nutrition when grown as a commercial crop. Field studies were conducted to determine the short-term response of recently transplanted Dominican oregano to N, P, and K in a clay soil. Dominican oregano plants 15 to 20 cm tall were used. A randomized complete-block design with 13 treatments and three replications was utilized. Treatments were 0 fertilization (control) and 20, 40, 60, and 80 kg/ha of N, P2O5, or K2O applied 20 days after transplanting. Experimental units consisted of 12 plants at with a distancing of 1.0 × 1.0 m. Above-ground biomass accumulation was determined 3 months after treatment. Analysis of variance and regression analysis was performed on the resulting data. Biomass accumulation in Dominican oregano was significantly influenced by N, P, and K fertilization rates. Crop yield increased linearly as nutrient rates increased. Nitrogen fertilization had a stronger influence on Dominican oregano biomass accumulation than P and K fertilization. Results indicate that fertilizing Dominican oregano increases its biomass yield. However, due to its seasoning nature, the effect of mineral fertilization on the essential oils of this crop must be analyzed.
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