Espósito, G.P(1); Culasso, V. (1); Balboa, G.R. (1) Castillo, C.(1); Seiler, J. (1)
Universidad Nacional de Río Cuarto. Ruta Nac. 36 km 601 Río Cuarto, Cba. gesposito@ayv.unrc.edu.ar

Abstract:
The uneven emergencies of the culture of maize that give a not uniform stand of plants
(dominated and dominant) generates imperfect intra-specific competition causing
important losses of final grain yield. The purpose of the present work was evaluate in two
maize hybrids how is it modifiedthe grain yield as a consequence of the proportion of
plants emerged with a delay of 14 days. Research was conducted in the Experimental
Field of the UNRC, Rio Cuarto, Cordoba, Argentina, during the 2005/2006 (one hybrid)
and 2006/07 (two hybrids) growing seasons, with the single cross hybrids Nidera AX 877
and Dekalb 615. 14 days after the sowing, the plants thin and the hand sow were done in
random of the 0, 15, 30 and 45 % of the population, defining four treatments. The
experimental design was in complete blocks randomized with three repetitions. The
behavior of the two hybrids and the four treatments were analyzed statistically by means
of an Analysis of Variance (ANOVA). It was possible to determine that there is a strong
impact in the final performance of corn productivity when the population of plants is not
uniform principally in major productivity campaign. Was determined a relationship
between lost yield and percent of temporal uneven in order to 0.25-0.30% per each 1%
delayed plants. Finally, these results highlight the importance of the planting quality on
corn productivity.
Key words: corn, uneven emergence, stand stablishment, intra specific competition

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