TY - JOUR AU - Espinosa, Alejandro AU - López, Miguel A. AU - Tadeo, Margarita PY - 2016/05/31 Y2 - 2024/03/28 TI - Agroeeonomic analysis of the use of advaneed generations of improved eorn seed in high valleys of Mexico. JF - Agronomía Mesoamericana JA - Agron. Mesoam. VL - 9 IS - 1 SE - Articles DO - 10.15517/am.v9i1.24629 UR - https://revistas.ucr.ac.cr/index.php/agromeso/article/view/24629 SP - 53-58 AB - <p class="p1">The productive capacity of fue generations F<span class="s1">1 </span>(commercial seed) and F<span class="s1">2 </span>(recycled seed) from the H-34, H- 33, H-68, and H-36 corn hybrids, produced for high valleys of Mexico by the Centro Nacional de Investigaciones Forestales y Agropecuarias (lNIFAP) was evaluated. The simple cross of CIMMYT, and as a reference, of an open pollinated corn variety from INIFAP (V-23) were also evaluated. An analysis of yield and other agronomic characteristics of the materials was performed. Likewise, an economic analysis to determine the optimal alternative for growers concerning the use of seeds during two cycles, was undertaken. All of the hybrids showeda yield decrease when using F<span class="s1">2 </span>seed, compared to the use of F<span class="s1">2 </span>seed, with the decrease varying from 5.5% to 51.3%. The greatest yield decrease due to use of seed F<span class="s1">2 </span>corresponded to the simple hybrid H-34 (F<span class="s1">2</span>), which only yielded 4.327 kglha, as compared to 8.892 kg/ha for the corresponding F<span class="s1">1 </span>seed. Yield of the V-23 variety was 7.488 kg/ha, which was statistically surpassed by the CIMMYT F<span class="s1">1 </span>simple cross (9.930 kglha), and was not significantly different from H-34 (F<span class="s1">1</span>), H-33 (F<span class="s1">1</span>) - 8.887 kglha; H-36 (F<span class="s1">1</span>) - 9.133 kglha; and F<span class="s1">2 </span>CIMMYT simple crosses (8.999 kglha). Excluding the latter, no other genotype surpassed the yield of the F<span class="s1">2 </span>seed variety. Economic analysis was based on the yields' trial results, on information about prices of seeds and grains, and the seed/hectare rateo The best option for corn producers of the region is to use double hybrid commercial seeds (F<span class="s1">1</span>) in both years, which provides a marginal return rate of over 1.500%.</p> ER -