Performance of Coffea arabica L. In Changing Climate of North Sumatra of Indonesia

Abstract The performance of Arabica coffee (Coffea arabica L.) depends on the climate, soil, pests, and elevation. Information on the performance of Arabica coffee growing in the changing climate of North Sumatra has not been available so far. To provide such information, 28 genotypes were studied. The nested design used three factors. Seven climate zones, two locations in each climate zone, and two coffee farms (genotype, G) in each location were selected. The research showed that the genotypes were highly significantly different (α = 0.01). G5, G6, and G20 produced the heaviest hundred beans. G13, G19, and G25 suffered the least coffee berry borer infestation (CBBI). The length of rainy season became the most important factor (r2 = 0.54). The CBBI (y, %) correlated significantly and negatively with the elevation (x, m) with the equation of y = 46.4 – 0.025x. The climate zones showed a significant difference (α = 0.05). The genotypes produced heavy beans also in two wet months of the rainy season and one dry month. The temperature (x, °C) was the most important factor affecting CBBI (r2 = 0.65) with the equation of y = –338.2 + 15.5x. The soil pH correlated significantly and positively with beans weight and bean width.