Productivity and stability of free-pollinated corn varieties in the High Valleys of Mexico
DOI:
https://doi.org/10.29312/remexca.v15i6.3032Keywords:
Zea mays L., free-pollinated varieties, productivity, stabilityAbstract
In the High Valleys of Central Mexico, improved white-grained and free-pollinated corn varieties are needed for medium-productivity conditions. This research aimed to determine the productive capacity and the stability of grain yield of a group of free-pollinated corn varieties using the AMMI procedure. Nine varieties of conical race of intermediate cycle corn were evaluated, four experimental from the Cuautitlán Faculty of Higher Studies of the National Autonomous University of Mexico, two experimental from the National Institute of Forestry, Agricultural and Livestock Research-Valle de México Experimental Field and three commercial control varieties from the National Institute of Forestry, Agricultural and Livestock Research- Valle de México Experimental Field, in the spring-summer cycle of 2016 to 2019, in two locations, the Cuautitlán Faculty of Higher Studies of the National Autonomous University of Mexico and the National Institute of Forestry, Agricultural and Livestock Research-Valle de México Experimental Field. A randomized complete block experimental design with four replications was used. Yield data and other variables were analyzed in a factorial arrangement, considering environments, genotypes, and their interactions as sources of variation. The AMMI procedure was used to evaluate the varieties for their stability in grain yield. The combined analysis of variance detected highly significant differences for all variables between environments, genotypes, and the genotype-by-environment interaction. The overall mean yield was 5 090 kg ha-1. In the comparison of means between environments, in 2017, the Cuautitlán Faculty of Higher Studies of the National Autonomous University of Mexico had the best yield, with 9 163 kg ha-1. The Maíz Texotli Puma variety expressed the best yield with 6 491 kg ha-1. The free-pollinated corn varieties with the best stability in grain yield were V 80 Turrent and V 23 Huamantla.
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