Response of corn (Zea mays L.) to doses of nitrogen and potassium in soil in the region of Lavras, State of Minas Gerais, Brazil: I. Effect on different agronomic traits

De-Rezende, G.-Milanez; Da-Silva, G.-Luiz; Paiva, L.-Euripides; Dias, P.-Francisco; De-Carvalho, J.-Guedes

Ciencia e Pratica 18(4): 403-407


Accession: 009347576

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The experiment was carried out in a greenhouse at Escola Superior de Agricultura de Lavras, Lavras, state of Minas Gerais in the period of september-november 1990. The objective of this study was to evaluate the influence of nitrogen and potassium on different agronomic traits. Increasing dosages of N an increase in initial plant height, leave number at 30 and 60 days after planting and percentage of crude protein in the leaves. Potassium fertilization also increased 60 days after planting, dry matter production of the aerial part (leaf + steam) and root, when applied along nitrogen. the percentage of crude protein in the stem increased with the doses of nitrogen, but addition of potassium was depressing. Within the limits of the doses of N e K applied, the results suggested a little competitive effect on the uptake of NH-4+ and K+.