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Coffee genotypes cultivated in the Amazonian region have been gaining increasing prominence in Brazilian plantations. This study aimed to quantify nutrient accumulation in the fruits, grains, and husks of Robusta coffee genotypes cultivated in the Brazilian Amazon and estimate genetic diversity. The experiment was conducted in Alta Floresta D'Oeste—Rondônia, Brazil. To assess nutrient accumulation, fresh fruits were collected. These were dried, processed, separated into grains and husks, and subjected to chemical analysis. Nutrient accumulation in fruits, grains, and husks, as well as the grain/husk ratio, underwent analysis of variance through the F-test (p < 0.01. For each evaluated trait, the experimental coefficient of 337 variation (CVe), genetic coefficient of variation (CVg), and genotypic determination coefficient (H2) were also estimated. Variability was observed among Robusta coffee genotypes, with VP06, AS4, and AS10 being the most dissimilar. LB080 had the lowest dry fruit weight and the lowest percentage of grains in relation to husks. ZD156 accumulated more K in the grains, while VP06 and AS10 were the genotypes that accumulated more nutrients in the husks. Nutrients N, K, Ca, and P are accumulated in larger quantities, necessitating the calibration of mineral fertilization dosages and distribution. [ABSTRACT FROM AUTHOR]

An adequate nutritional management is essential to ensure high coffee yields. In view of the wide genetic variability among Coffea canephora genotypes, due to the allogamy of the species, the nutritional demand is also divergent. The objective of this study was to evaluate the leaf nutrient concentration in early (V08), medium (V12), and late-maturing genotypes (V13) of cultivar Vitória Incaper 8142. Twenty-three leaf samples were used to determine the macro- and micronutrients, collected in a 1-year period on six representative plantations in the north of Espírito Santo. The influence of the climatic conditions of rainfall and temperature, and of the vegetative growth and reproductive periods of the coffee trees on the leaf concentrations of macro- and micronutrients was confirmed. The foliar concentrations of N, P, K, S, B, Ca, Cu, and Fe of the early-maturing genotype V08, as well as those of N, Ca, S, and B of the medium-maturing genotype V12 were statistically superior to those of the late-maturing genotype V13. For all genotypes, a deficiency of micronutrient B was stated during the grain-filling period, indicating that the plant should be supplied with this element prior to this period. The nutrient concentrations frequently exceeded the recommended range, particularly during the grain-filling period. [ABSTRACT FROM AUTHOR]