Agronomic Performance of Acaí (Euterpe oleracea) Using Organic Compost Associated with Dolomitic Limestone

Objectives This study aimed to evaluate the effect of compost doses associated with dolomitic limestone on the biometry, nutritional, and physiological state of Euterpe oleracea under organic cultivation, contributing to sustainability in the Amazon. Methods The experiment was conducted in Santo Antônio do Tauá/PA, in the community of Campo Limpo, using a randomized block design in a 7 × 2 factorial scheme. Factor 1 comprised six compost doses (2, 4, 6, 8, 10, and 12 kg) and factor 2 included the presence or absence of liming. The control received no fertilization. In total, 14 treatments with six replicates resulted in 84 experimental units, each containing two BRS Pai d’égua Euterpe oleracea plants. Biometric, nutritional, and physiological variables were evaluated. Results Compost application, particularly at 8–10 kg combined with liming, provided the best results. Organic fertilization increased stipe height by 41.66%, circumference by 29.71%, circumference at breast height by 16.13%, and number of leaves by 11.01%. It improved nutrient levels (N > S > Ca > K > P > Mg; B > Mn > Fe), enhanced relative chlorophyll content by 38.84%, and positively affected CO₂ assimilation, stomatal conductance, transpiration, intercellular CO₂ concentration, and water use efficiency. Conclusions The combination of 8–10 kg of compost per plant with dolomitic limestone promotes better biometric, nutritional, and physiological performance of Euterpe oleracea under organic management, supporting sustainable açaí production in the Amazon.