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Three way hybrids present the advantage of the heterosis in the maize production, besides, they represent agronomic and economic advantages in certificated seed production; Thus, with the objective of knowing the yield and agronomic characteristics of maize hybrids, during the spring summer season in 2021, were evaluated 12 maize hybrids, on which, there are participating inbred lines of the maize breeding program of Cotaxtla, Ver., and Iguala, Gro., from INIFAP and inbred lines from CIMMYT. These hybrids were arranged under complete blocks at random, with 12 treatments and four replications in plots of two rows 5m long, and 62,500 plants ha-1. The agronomic traits were: Grain yield, days to tassel and silking, plant and ear height, plant and ear aspect and sanity, lodging, bad husk cover and ear rot. From the combined analysis for grain yield there was found significant differences for genotypes (G) and for the Genotype environment interaction (GE). The best hybrids were above 7.0 t ha-1 in grain yield, 9 to 13% more than the check H-520; These hybrids were: (T35xT10)xLT154, (T35xT10)xLT156, (CML500xCML498)xLT155, (CML264xCML311)xLT-156, (LT-164xLT-165)xLT-156, (LT-169xLT-170)xLT-156. The inbred line LT156, participated in the best hybrids as a male parent; This line present good General Combining Ability.

Synthetic maize varieties present advantages in adaptability, they can be used for several planting seasons, without affecting the yield and is easier the seed production. Thus, with the main objective of knowing the yield and agronomic traits of synthetic maize varieties for the tropic, during 2013 to 2018 there was conducted an experiment in Cotaxtla and Carlos A. Carrillo in Veracruz and Huimanguillo in Tabasco state locations. The experiment was distributed in complete blocks at random design with 21 entries and three replications in plots of two rows 5m long and 62,500 pl ha-1. The agronomic traits were: Grain yield, days to tassel and silking, plant and ear aspect and sanity, lodging, bad husk cover and ear rot. From the combined analysis for yield, there was found high significant differences for Varieties (V), For environments (E), and for the interaction VxE, and a coefficient of variation of 16.20%. The Carlos A. Carrillo, Ver., location in 2016B, recorded the highest yield with 6.94 t ha-1. The best five synthetics at 0.05 of probability were: VS-536, Synthetic 2B, Synthetic 5B, Synthetic 2C and Synthetic 11C.