Los forrajes de corte y pastoreo son muy importantes en el norte y centro de México. Debido a la respuesta diferencial de los genotipos en cada ambiente, el desarrollo de nuevas variedades implica determinar su estabilidad de producción para su posterior liberación en una región determinada. Se evaluó la producción de materia seca por corte y acumulada en dos cortes de veintidós genotipos de triticale (X Triticosecale Wittm.) facultativos e intermediosinvernales en 14 ambientes del norte de México durante los ciclos 1996-1997 al 1999-2000. La producción se analizó con el modelo AMMI (Additive Main Effects and Multiplicative Interaction) mediante la caracterización de los genotipos por la magnitud de su interacción con los ambientes (IG*A) y su estabilidad de rendimiento. El análisis por corte discriminó los materiales de forma eficiente basado en su hábito de crecimiento, clasificando con precisión a los genotipos por su producción y estabilidad. Los genotipos 3 y 5 (facultativos) fueron recomendables para un solo corte y los genotipos 7 y 13 (intermedios invernales) fueron adecuados para cortes múltiples. El genotipo 13 (intermedio-invernal) fue el más estable y productivo para materia seca acumulada. El modelo separó efectivamente los dos tipos de hábito de crecimiento en los cortes individuales, debido a diferencias en su fenología que influyeron en su producción de materia seca.
El modelo también caracterizó eficazmente los genotipos por su estabilidad, detectando en forma precisa la magnitud y signo de las interacciones presentadas por cada uno, tanto en los cortes individuales como en la producción de materia seca acumulada.
Forage for cut and grazing are very important in northern and central Mexico. Because of the differential response of genotypes in each environment, the development of new cultivars includes determining the production stability for future release in a certain region. Dry matter yield was evaluated per cut and accumulated in two cuts of 22 facultative and winter-intermediate triticale genotypes (X Triticosecale Wittm.) in 14 environments in northern Mexico during the cycles of 1996-1997 to 1999-2000. Single and accumulated production were analysed with the AMMI model (Additive Main Effects and Multiplicative Interaction), and the genotypes were characterised based on the extent of their interaction with the environment (IG*A) and on their yield stability. The analysis per cut efficiently identified genotypes based on their growth habit, and classified them accurately with respect to production and stability. The facultative genotypes 3 and 5 were recommended for only one cut and the winter-intermediate genotypes 7 and 13 for multiple cuts. The winter-intermediate genotype 13 was the most stable and productive for accumulated dry matter.
The model effectively separated the two types of growth habit in the individual cuts in response to differences in phenology that afftected dry matter production. The AMMI model also efficiently characterised the genotypes with respect to their stability, and accurately detected the extent and sign of the interactions presented by each, both in the individual cuts and in the production of accumulated dry matter.Forage for cut and grazing are very important in northern and central Mexico. Because of the differential response of genotypes in each environment, the development of new cultivars includes determining the production stability for future release in a certain region. Dry matter yield was evaluated per cut and accumulated in two cuts of 22 facultative and winter-intermediate triticale genotypes (X Triticosecale Wittm.) in 14 environments in northern Mexico during the cycles of 1996-1997 to 1999-2000. Single and accumulated production were analysed with the AMMI model (Additive Main Effects and Multiplicative Interaction), and the genotypes were characterised based on the extent of their interaction with the environment (IG*A) and on their yield stability. The analysis per cut efficiently identified genotypes based on their growth habit, and classified them accurately with respect to production and stability. The facultative genotypes 3 and 5 were recommended for only one cut and the winter-intermediate genotypes 7 and 13 for multiple cuts. The winter-intermediate genotype 13 was the most stable and productive for accumulated dry matter.
The model effectively separated the two types of growth habit in the individual cuts in response to differences in phenology that afftected dry matter production. The AMMI model also efficiently characterised the genotypes with respect to their stability, and accurately detected the extent and sign of the interactions presented by each, both in the individual cuts and in the production of accumulated dry matter.
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