Improvement of the maize population "Elite Synthetic NT" for soils with low nitrogen content
Santos, M.X. | Guimaraes, P.E.O. | Pacheco, C.A.P. | Franca, G.E. | Parentoni, S.N. | Gama, E.E.G. | Lopes, M.A.
The maize population 'Elite Synthetic NT' has been selected with the objective of improving its yield potential in soils with low nitrogen (N) availability. During the 1994/95 season, 144 half-sib families showing good male-female flowering synchrony were evaluated with and without N fertilizer at Sete Lagoas, MG. The experimental design utilized was a 12 x 12 lattice, with 5 m plots. The open-pollinated variety 'BR 106', selected in soils with high fertility, was used as a between block check. Mean ear weight for the selected families in N+ and N- environments averaged 4,511 kg/ha and 3,327 kg/ha, respectively. Yield reduction between environments averaged 27.14 Per cent for the selected families and 65.8 Per cent for BR 106. The results indicate that selection in N- environments is an efficient approach for developing genotypes with better performance in soils with low nitrogen content.
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