Generally the maize yield per unit area responds to density changes. Optimum plant density for maximum grain yield per unit area may differ from hybrid to hybrid. Objective of the study was: to estimate the optimum density for maximum grain yield per unit area to seven hybrids, the density impact on stand uniformity,  to evaluate how some hybrids, important yield parameters (yield per plant, ear length and kernel row number) respond to density changes. Experimentation was conducted at the Agricultural Research Station, Turda, Romania, during the 2006 and 2007 seasons under natural conditions, without irrigation. Seven single-cross hybrids (FAO 320 - 450) were grown at three densities (2.5, 4.2, 8.4 pl/m 2 ).Comparison of means was conducted by least significance difference (LSD) after analysis of variance for a two-factor split-plot design. In maize culture should take the necessary measures to achieve the optimum density for the chosen hybrids and the most uniform stand possible.

yield per plant, ear length; kernel row number; plant population

Presentation: oral