Título:	Uptake and exportation of micronutrients by transgenic cultivars of maize under no-tillage in the Brazilian Cerrado.
Autoria:	GUTIÉRREZ, A. M. RESENDE, A. V. de SILVA, K. G. M. MARTINS, D. C. SIMÃO, E. de P. MOREIRA, S. G. FERREIRA, J. P. da C.
Afiliação:	Aarón Martínez Gutiérrez, Universidade Federal de Viçosa; ALVARO VILELA DE RESENDE, CNPMS; Carine Gregorio Machado Silva, Universidade Federal de Lavras; Denize Carvalho Martins, Universidade Federal de Viçosa; Eduardo De Paula Simão, Universidade Federal de Viçosa; Silvino Guimarães Moreira, Universidade Federal de Lavras; Jose Paulo da Costa Ferreira, Universidade Federal de São João Del-Rei.
Ano de publicação:	2018
Referência:	Journal of Agricultural Science, Cambridge, v. 10 n. 9, p. 304-314, 2018.
Conteúdo:	Introducing cultivars of high productive potential with adequate agronomic management has contributed to the increase of maize yield in Brazil. This study aimed to characterize the extraction and exportation of micronutrients by modern maize hybrids grown in no-tillage system in the Cerrado region (Brazilian Savannah) with two fertilization levels. We established two crop environments with differentiated levels of soil fertilization, use of products for seed treatment and leaf fertilization, in which four transgenic hybrids were grown. For each environment, we used an experimental design of randomized blocks with four replicates. There were eleven plant samplings during the crop cycle to quantify dry mass production and Cu, Fe, Mn and Zn extraction. Micronutrient uptake is increased when a hybrid with higher potential for biomass production grows in an environment with greater supply of nutrients. Uptake persists throughout the maize cycle, including during the final stages of the reproductive phase, showing late demand for the crop. On average, after tasseling, about 39, 50, 42, and 49% of the total Cu, Fe, Mn and Zn absorption still occurs, respectively. Total uptake of Cu, Fe, Mn and Zn are, respectively, around 8, 199, 58 and 40 g to produce a tonne of grain, from which 23, 5, 8, and 42% are exported by the harvest. Micronutrient uptake and exportation rates for the studied transgenic hybrids are lower than the ones previously reported in Brazil and in works abroad. Keywords
Thesagro:	Rendimento Zea Mays Exigência Nutricional Absorção
Digital Object Identifier:	10.5539/jas.v10n9p304
Tipo do material:	Artigo de periódico
Acesso:	openAccess
Aparece nas coleções:	Artigo em periódico indexado (CNPMS)