| Sumario: | To evaluate the growth of the roots and vegetative part (leaves 4- stems) on cassava (Manihot esculents. Crantz) an experiment was carried out in the Cerrados National Research Center. Planaltina, Federal District, Brazil, from 1979 to 1982.
Stem cuttings, 20 cm long, of the cultivars IAC 352-7 (Jacang) Cavalo. Cacau-Vermelho and Sonora were planted equally spaced by 1 0 m Six plants per cultivar were harvest-ed every two months, from the sixth to the twenty-fourth month.
Two patterns of root growth were identified One showed an increasing root weight up to the eighteenth month while the other showed an increase of root weight up to the twentwfourth month. Maximum root yield for cultivars Jacana, Cacau-Vermelho and Cavalo was obtained eighteen months after plantig, while for 'Sonora' maximum root yield was obtained twenty-four months after planting.
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