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A study was carried out in Araruna County, State of Paraná, to understand the relationship between the total dry matter yield and its proportion allocated to the storage roots of cassava (Manihot esculenta Crantz) plants in the second vegetative cycle. The experimental design was a randomized complete block in split-plot scheme with four replications. The plots consisted of the Mico, IAC 13 and IAC 14 cultivars and the monthly harvesting dates were assessed in the sub-plots. The results showed that the Mico and IAC 13 cultivars were more efficient in allocating dry matter to the storage roots. The IAC 14 cultivar allocated a higher proportion of assimilates to stems compared with the other two cultivars. With regard to the influence of harvesting time, the lowest harvest indexes were observed in the periods of more intense vegetative growth. However, the highest carbohydrate proportions were allocated to the storage roots during periods of low vegetative growth. Com o objetivo de uma melhor compreensão da relação entre a produtividade total de massa seca e a proporção de alocação desta nas raízes tuberosas em plantas de mandioca, foi conduzido no município de Araruna-PR, um experimento em delineamento de blocos casualizados, em esquema de parcelas subdivididas com quatro repetições. Nas parcelas foram dispostas três cultivares (Mico, IAC 13 e IAC 14), e nas subparcelas dez épocas de colheita mensais, a partir do início do segundo ciclo vegetativo das plantas. As cultivares Mico e IAC 13 foram mais eficientes do que a IAC 14 em alocar massa seca nas raízes tuberosas, ao passo que esta última alocou maior proporção de massa seca em suas hastes. Em relação às épocas, os menores índices de colheita ocorreram em períodos de mais intenso crescimento vegetativo das plantas, ao passo que a maior proporção de carboidratos foi alocada nas raízes tuberosas em períodos de baixo crescimento vegetativo

Dry matter production and distribution in three cassava (Manihot esculenta Crantz) cultivars during the second vegetative plant cycle