Banca de DEFESA: JOÃO LUIZ RESENDE LOURENÇO

COFFEE YIELD GENOTYPE X ENVIRONMENT INTERACTION BENEFITS FROM ROBUST AMAZON CULTIVARS CULTIVATED IN WEST AMAZON

Coffea canephora, Robusta, Conilon, hybrids

Yield understood as the relationship between cherry coffee harvested in the field and processed coffee, is an important component of the productivity of the Coffea canephora coffee tree. In addition to environmental factors that influence grain filling, this characteristic presents an important genetic component, influenced by the moisture content, hull, and grain characteristics of different genotypes. The objective of this study was to quantify the yield of processed coffee of Amazonian Robusta cultivars grown in irrigated and rainfed environments in the Western Amazon. According to the maturation cycle of each clone, washed cherry coffee samples were harvested using a completely randomized design in a factorial scheme with six repetitions to characterize the effects of genotypes, environments, and genotype x environment interaction. Estimates of yield were obtained from the reduction in mass observed during drying and the reduction in mass observed during hulling, both corrected for 12% moisture. The masses maintained after drying showed a complex GxE interaction, characterized by changes in the ranking of genotypes from one environment to another, compared to the mass maintained after hulling, which showed a predominantly simple GxE interaction. Therefore, moisture content was more influenced by the environment than hull content in the fruits. The contrasting environments of Porto Velho and Ouro Preto do Oeste represent the majority of coffee production in the region, conducted in the Am and Aw climatic types and in dystrophic and eutrophic red and yellow latosols. The clones BRS1216, BRS3220, and BRS3137 showed the highest yields, while the clones BRS2314, BRS3213, and BRS2336 showed the lowest yield estimates, and the clones BRS2299, BRS3210, BRS3193, and BRS2357 showed performance close to the average of this group of genotypes