Classificação do ciclo de desenvolvimento de cultivares de cafeeiro através da soma térmica

Abstract

The choice of coffee cultivars suitable for each region, is of great importance. The choice of coffee cultivars suitable for each region, is of great importance because of the differences in climate and soil conditions and microclimate. In order to facilitate the recommendation of regional and local cultivars for harvest scheduling, this study aimed to evaluate the thermal requirements for the different growth stages, as well as classify the maturity cycle of ten genotypes of Coffea arabica L. at conditions of Uberlândia, MG. The experimental design was a randomized complete block with 10 treatments and 4 replications, each plot consists of a row of eight plants, which were evaluated at 4 central plants. During the crop year 2008/2009, it was observed for each cultivar the date of occurrence of phenological stages of flowering to fruit green cane, cane fruit tree to fruit to fruit and flowering cherry. The degree-day values were analyzed using the mean, standard deviation and coefficient of variation. Underwent degree day data obtained for the total cycle analysis of variance and the application of Scott & Knott test at 5% significance. The average coefficient of variation for the total cycle proved to be low for most cultivars, cultivars IAC 99 and Topaz MG 1190 showed high values .