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- The present study aimed to determine the curves of macronutrients and dry matter accumulation in grain sorghum DKB 599, grown in a semiarid region. A field experiment was conducted on a sandy loam eutrophic red Latosol (Oxisol) in Janauba, State of Minas Gerais (MG), Brazil, in a randomized block design with four replications. As statistical method, a nonlinear regression, sigmoidal function with three parameters was used. After drying, the plants were weighed and ground to determine N, P, K, Ca, Mg and S concentration. Grain sorghum plants accumulate nutrients in their shoots in the following order: N> K> Ca> P> Mg> S. The highest concentrations of K and N were observed in stems and grains, respectively. In the conditions of this experiment, the most favorable time to perform nitrogen and potassium topdressing fertilization is when the plants present seven fully expanded leaves or 24 days after the emergency (DAE). Keywords : fertilization, growth, nutrition, Sorghum bicolor. ABSORCAO DE MACRONUTRIENTES E ACUMULO DE MATERIA SECA NO SORGO GRANIFERO RESUMO - Este trabalho teve como objetivo determinar as curvas de acumulo de materia seca e macronutrientes no sorgo DKB 599 cultivado em regiao semiarida. O experimento foi conduzido em campo sobre um Latossolo Vermelho eutrofico, de textura franco-argilosa, no municipio de Janauba-MG, Brasil, em delineamento experimental de blocos casualizados, com quatro repeticoes. Utilizou-se o modelo de regressao nao linear, funcao sigmoidal com tres parâmetros como metodo estatistico. Apos secagem, cada parte da planta foi pesada e moida para, em seguida, determinarem-se os teores de N, P, K, Ca, Mg e S. As plantas de sorgo granifero acumulam nutrientes em sua parte aerea na seguinte ordem: N > K > Ca > P > Mg > S. As maiores concentracoes de K e N foram observadas, respectivamente, nos caules e nos graos. Nas condicoes de conducao do experimento, a epoca mais propicia para realizar a adubacao nitrogenada e potassica em cobertura e quando as plantas apresentam sete folhas totalmente expandidas ou 24 dias apos a emergencia (DAE). Palavras-chave: fertilizacao, crescimento, nutricao, Sorghum bicolor.

MACRONUTRIENTS ABSORPTION AND DRY MATTER ACCUMULATION IN GRAIN SORGHUM