Este trabalho teve como propósito determinar as temperaturas base inferior – Tb, e superior – TB, para cafeeiro arábica. Avaliaram-se, portanto, as cultivares Acaiá Cerrado (MG-1474) e Rubi (MG-1192), com as quais se promoveu o estudo associando-se coeficientes de cultura – Kc, a graus-dia de desenvolvimento – GDD, na Universidade Federal de Lavras – UFLA, entre março de 2003 e setembro de 2004. Usou-se, para análise estatística, um estudo com regressão e, para comparações entre as regressões, o procedimento descrito em Snedecor & Cochran (1989). Obtiveram-se os valores de GDD com a metodologia apresentada por Ometto (1981), comparada com os métodos de Arnold (1959), Snyder (1985) e Dufault (1997); Tb de 12,9 °C e TB de 32,4 °C, foram obtidos após comparações entre os métodos: menor desvio padrão em graus-dia e dias, coeficiente de variação em graus-dia, coeficiente de regressão e análise de Kc versus GDD; para ambas as cultivares até 4200 GDD, chegou-se a valores de 0,20, 0,89 e 0,48, para Kc mínimo, máximo e médio, respectivamente.
This paper had as its purpose the determination of the inferior base temperature – Tb, and superior – TB, for arabic coffee plants. The cultivars “Acaiá Cerrado” (MG-1474) and “Rubi” (MG-1192) were evaluated, associating crop coefficients – Kc, to growing degrees-day – GDD. The trial was carried out in the “Universidade Federal de Lavras” – UFLA, from March 2003 to September 2004. For statistical analysis, a study with regression and comparisons among regressions using the procedure described in Snedecor & Cochran (1989) were used. The values of GDD were obtained with the methodology presented by Ometto (1981), and were compared to the methods presented by Arnold (1959), Snyder (1985) and Dufault (1997); Tb = 12.9 °C and TB = 32.4 °C were obtained after comparisons among the methods: least standard deviation in degrees-day and days, coefficient of variation in degrees-day, regression coefficient and analysis of Kc versus GDD were found. For both cultivars, up to 4200 GDD, values of 0.20, 0.89 and 0.48 were found, for Kc minimum, maximum and mean, respectively.
