Abstract

PEREZ-DE LA LUZ, Ricardo et al. Evaluation of maize native population in environments with frosts in High Valleys, Puebla. Rev. Mex. Cienc. Agríc [online]. 2011, vol.2, n.5, pp.703-714. ISSN 2007-0934.

In Mexico, the maize planted area is eight million hectares, out of which 1.2% is stricken by frost. In Puebla State, this percentage is 0.8% and 1.7% in High Valleys. The aim of this study was to evaluate the effect of frost on grain yield and to select native populations with higher performance in presence of frost. 61 native populations and three improved varieties were evaluated, through a simple lattice design 8*8 with two repetitions. The experiments were established at three locations in Puebla State. Planting dates were March 30^th in Emiliano Zapata, Cuyoaco; April 7^th in Santa Inés Borbolla, Chalchicomula de Sesma and May 4^th in Santa Cruz Coyotepec, San Juan Atenco; these locations are characterized by its rainfed conditions and frosts in 2007. The combined analysis of variance indicated that the frosts affected grain yield of native and improved populations; but there were varieties such as CPue-131, CPue-448 and CPue-134 that showed a higher average yield and environmental stability that improved varieties. Mean test for locations in the combined analysis indicated that Emiliano Zapata was the least affected by frost with 3 510 kg ha^-1.

Keywords : adverse factors; grain yield; low temperatures.

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