Durante o processamento do café, por via úmida ou seca, ocorrem processos fermentativos. Estes, podem ser naturais ou induzidos e influenciam a qualidade de bebida. O objetivo desse trabalho foi testar o efeito de métodos de fermentação anaeróbica sobre a qualidade de bebida do Robusta Amazônico (Coffea canephora) produzido no estado Rondônia. A pesquisa foi realizada em propriedade rural localizada no município de Novo Horizonte do Oeste - RO, utilizando o clone 25, amplamente cultivados na região. O estudo se baseou em dois experimentos conduzidos em delineamento de parcelas subdividas para quantificação dos efeitos da fermentação por maceração semicarbônica e da fermentação com inoculação de levedura, considerando os frutos íntegros ou despolpados. Os cafés foram avaliados de acordo com a metodologia Protocolo de degustação de Robustas Finos- PDRF. Não foi observada diferença significativa nas notas de qualidade de bebida entre os tratamentos, indicando que a fermentação e o processamento natural têm potencial para produção de bebida fina. Os procedimentos de pós-colheita foram realizados de forma adequada considerando as estimativas do coeficiente de variação experimental e a nota média de qualidade da bebida. Apesar de não ter sido observada diferenças significativas nas notas finais de qualidade da bebida, observa-se expressiva diferença nos descritores de qualidade sensorial, entre os tratamentos fermentados e naturais. O agrupamento a partir dos descritores da análise sensorial indica a formação de dois grupos distintos, formados por tratamentos de processamento fermentado e natural. Os processos de fermentação induzida, via Maceração semicarbônica por 20 dias, se destacaram dos demais, sendo caracterizada como bebida de aspectos frutado, doce e caramelo

. In relation to resistance of orange rust, most of the genotypes were resistant to disease, and 75% of the genotypes did not present any type of infection symptoms. Among the susceptible genotypes, there was a variation between 1 and 15% in the degree of lesion intensity.

The coffee outturn index, understood as the relation between the cherry coffee fruit harvested from the field and its respective processed grains, is an important component of the Coffea canephora bean yield. The aim of this study was to quantify the coffee outturn index of the Amazon Robusta cultivars grown in irrigated and dryland Western Amazon environments. According to the maturation cycle of each clone, washed samples of cherry coffee were collected considering a completely randomized factorial design for characterization of the effects of genotypes, environments, and the genotype × environment (G×E) interaction. The contrasting environments of Porto Velho, RO, and Ouro Preto do Oeste, RO, Brazil, represent most of the coffee growing sites located in Am and Aw climate types, cultivated in Red and Yellow Oxisols, typical of the Western Amazon. The weight reductions through drying exhibited a G×E interaction of the complex type, which is characterized by a change in the ordering of genotypes from one environment to another, whereas the weight reductions through hulling exhibited a G×E interaction predominantly of the simple type. The reduction in weight due to drying was more affected by the environment than reduction in weight after pulping. The clones BRS1216, BRS 3220, and BRS3137 had the highest outturn index estimates and the clones BRS2314, BRS3213, and BRS2336 had the lowest outturn index estimates. The clones BRS2299, BRS3210, BRS3193, and BRS2357 had performance near the mean value of this group of genotypes. Considered together, the genotypes had a mean outturn of 24.41%, with an amplitude from 22.5% to 27.2%.

The nutritional management of the coffee clonal garden influences the production and physiological quality and seedlings production of vegetative propagules. Thus, this study aimed to analyze the seedlings’ production from clonal cuttings taken from Coffea canephora mother plants grown with increasing nitrogen mineral doses. The cuttings were taken from C. canephora var. botany Robusta, from the Embrapa Genetic Improvement Program of Rondônia. The mother plants received nitrogen fertilizer at different doses: 0 (Control); 50; 100; 150; 200; 250 and 300 kg of N per hectare divided into 4 applications, during 150 days of orthotropic stems growth (shoots). The following parameters were evaluated: Dry mass of cuttings, nutritional content of cuttings, and seedlings production, with growth analysis at 0, 48, 61, 80, 101, 122, 143, and 164 days after staking (DAS) and analysis of vegetative characteristics at 122 DAS. The nitrogen fertilization in the mother plant resulted in the variation of macronutrient accumulation in cuttings, but the order K> N> Ca> P> Mg> S was maintained, regardless of N dose. In addition, a positive correlation between nitrogen doses and dry matter accumulation, as well as the physiological quality of seedlings was identified.