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Previous issue date: 2017 === Coordena??o de Aperfei?oamento de Pessoal de N?vel Superior (CAPES) === A produ??o de novos conhecimentos sobre o crescimento e o ac?mulo de nutrientes ao longo do ciclo de desenvolvimento da planta de batata-doce pode auxiliar no ajuste da aduba??o, no aumento da efici?ncia dos recursos produtivos e, consequentemente, na eleva??o da sua produtividade. Neste sentido, o objetivo do trabalho foi caracterizar o crescimento, determinar a melhor ?poca de colheita e o ac?mulo de nutrientes na cultura da batata-doce. O experimento foi realizado no campus - JK da Universidade Federal dos Vales do Jequitinhonha e Mucuri - UFVJM, em Diamantina ? MG, utilizando o gen?tipo de batata-doce denominado ?Espanhola?. O delineamento adotado foi o de blocos casualizados, com quatro repeti??es. Os tratamentos foram 12 ?pocas de amostragens, realizadas com intervalos de 15 dias, para a coleta de tr?s plantas centrais da parcela. As plantas colhidas foram fracionadas em ra?zes, caule, folhas, e levadas ? estufa de circula??o for?ada para determina??o das respectivas massas secas. A massa seca e a ?rea foliar foram utilizadas para estimativa de ?ndices fisiol?gicos de crescimento. A partir da massa seca, tamb?m foram determinados os teores dos nutrientes. A quantidade de nutriente acumulado foi determinada multiplicando - se a massa seca pelo teor de cada nutriente. Os dados obtidos nas avalia??es de cada caracter?stica foram analisados por meio de regress?o. A planta de batata-doce apresentou maior crescimento entre 75 e 156 dias ap?s o transplantio (DAT). A ?poca de colheita mais adequada varia conforme a finalidade de uso. Para a obten??o de maiores produtividades totais e comerciais de ra?zes, a colheita deve ser realizada aos 180 DAT, enquanto que a parte a?rea (ramas) deve ser colhida entre 60 e 87 DAT. O ac?mulo de nutrientes variou conforme o ?rg?o analisado. A ordem decrescente de ac?mulo de nutrientes pelas ra?zes foi: N > K > Ca > P > Mg > S > Fe > Cu > Zn > Mn; parte a?rea: N > K > Ca > Mg > P > S > Fe > Mn > Zn > Cu; e total da planta (ra?zes + parte a?rea): N > Ca > K > P > Mg > S > Fe > Mn > Cu > Zn, considerando o per?odo de avalia??o de 15 a 180 DAT. === Disserta??o (Mestrado) ? Programa de P?s-Gradua??o em Produ??o Vegetal, Universidade Federal dos Vales do Jequitinhonha e Mucuri, 2017. === The production of new knowledge about growth and accumulation of nutrients throughout the development cycle of the sweet potato plant can help adjust fertilization, increase the efficiency of the productive resources and, consequently, increase its productivity. In this sense, the objective of the work was to characterize the growth, determine the best harvesting season and the accumulation of nutrients in the sweet potato crop. The experiment was carried out at the campus - JK of the Federal University of Vales do Jequitinhonha e Mucuri ? UFVJM, in Diamantina - MG, using the sweet potato genotype named Espanhola. A randomized block design with four replications was applied. The treatments were 12 sampling times, conducted at intervals of 15 days for the collection of three central plants of the plot. The plants were harvested and fractionated into roots, stem, leaves, and taken to a forced circulation oven to determine their respective dry masses. The dry mass and leaf area were used to estimate physiological growth rates. The nutrient contents were also determined from the dry mass. The amount of nutrient accumulated was specified by multiplying the dry mass by the content of each nutrient. The data obtained in the evaluations of each characteristic were analyzed by means of regression. The sweet potato plant presented the highest growth between 75 and 156 days after transplanting (DAT). The most suitable harvesting season varies depending on the purpose of its use. In order to obtain the greatest commercial and total yields of roots, the harvest should be performed at 180 (DAT), while the aerial parts (branches) should be harvested between 60 and 87 DAT. The accumulation of nutrients varied in accordance with the organ analyzed. The decreasing order of nutrient accumulation by the roots was: N> K> Ca> P> Mg> S> Fe> Cu> Zn> Mn; Aerial part: N> K> Ca> Mg> S> Fe> Mn> Zn> Cu and total of plant (roots + aerial part): N> Ca> K> P> Mg> S> Fe> Mn> Cu > Zn, considering the evaluation period from 15 to 180 DAT.
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