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The frequency of the appearance of atypical dry and rainy periods in the last years, has put up with the establishment of a new conception for the evaluation and management of sugarcane varieties, with a view to framing correctly the harvesting stage and its possible lengthening in certain places. Under those new premises 48 experiments in blocks totally at random were designed and established in four contrasting regions of the country. The behavior of three representative varieties of sugarcane of three different maturity periods (early, middle and late), harvested during the whole year, with ages between nine and 24 months, in the variable tons cane/ha, percentage of pol in cane and tons pol.ha-1 was studied. It was obtained as a result that the counties of Camagüey and Matanzas reached the highest values in the pol percentage in cane to harvest beginnings (November-December) in the three evaluated cultivares, while Holguín achieves them in the period from April-July. In accordance with the obtained results is possible to harvest with a bigger sugar content, if the crop age is increased and this is made in early time for traditional harvests (November-January) and varieties corresponding to the «families» of early and intermediate maturation are used, suggesting the possibility to contain crop ages and to determine the best combinations «family-age-moment» for edafoclimatic region, in such way that can guide the composition varietal and of stumps to be able to take place with the biggest efficiency. [ABSTRACT FROM AUTHOR]