Corn yield, interdependence and genotype-environment interaction in southeastern Mexico
DOI:
https://doi.org/10.29312/remexca.v16i8.3778Keywords:
localities, path analysis, stability, yieldAbstract
The Yucatán Peninsula presents high temperatures and soils where corn (Zea mays L.) crops have a yield of 2.4 to 3.2 t ha-1 under rainfed conditions. One strategy to correct the reduced productivity of corn in the YP is to generate, evaluate, and disseminate the use of hybrids and varieties that adapt to various production environments, identify those that present a superior and predictable grain yield, as well as the possible interdependence of yield with agronomic variables. The experiments were established under rainfed conditions in five locations of the YP to evaluate nine commercial corn genotypes -six hybrids and three varieties- in random complete blocks with three replications. Grain yield, plant and ear height, diameter, length and number of grains per ear were quantified. To identify the most outstanding genotypes and their interaction with the environment (stability and adaptability), the following was performed: combined analysis of variance across localities, test of means, principal component analysis, environment-genotype interaction analysis and path analysis. The H-520 hybrid presented the highest yield in both the favorable (Quetzalcóatl) and unfavorable (Micaela) environments, both in Campeche, and was the most stable; H-391 was the best choice for grain yield in San Felipe II, Yucatán, and YZ-1 in Cafetalito and Chetumal, Quintana Roo. Plant height had a direct effect, and ear length had an indirect effect; both were the variables that had the biggest impact on yield. Thus, the lower the plant height, the higher the yield and the longer the ear.
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