EVALUATION OF TROPICAL VARIETIES OF LOW PLANT CORN IN THE STATE OF VERACRUZ

Abstract

For determining the adaptability of maize experimental varieties developed for the humid tropic, in the winter-spring cycle of 1979/1980 eight uniform trials of short plant varieties were planted in different environments of the state of Veracruz. The design used was randomized blocks with 10 treatments and 4 repetitions, and for the variety discri­mination the method proposed by Eberhart and Russell in 1966 was follo­wed. lt was found that the single cross experimental hybrid HEV-2 was statistically superior in yield to the rest of the varieties at the 1% level of significance; according to the 1970 classification ·of Carballo the stable varieties were HEV-2, Cotaxtla XVI, Cotaxtla XVIII first CSMV, Tuxpeño cycle 17, Cotaxtla XVII and a hybrid from a prívate com­pany; the double cross hybrid H-509. and the CMB-10 performed better in favorable environments and were consistent; the varieties V-524 and CMB-9 performed betler in unfavorable environments and were consistent. The single cross HEV-2 showed the highest yield and stabil ity which is normally not expected for a single cross; the other varieties that showed stability were open pollinated ones with the exception of the hybrid from a prívate company.