Resultados del 13avo ensayo internacional de rendimiento de cebada (IBYT).

Spanish; Castilian. En 1990 se distribuyo el 13avo. ensayo internacional de rendimiento de cebada (IBYT) para que los colaboradores lo cultivaran en la temporada de primavera de 1991. Se enviaron 95 ensayos a colaboradores de 41 paises. Las lineas avanzadas y variedades incluidas en el ensayo fueron seleccionadas entre los mejores materiales del CIMMYT y las lineas sugeridas por fitomejoradores de distintas partes del mundo. Todas ellas se cultivaron y se observaron en un medio de alto rendimiento, sometidas a la presion de las principales enfermedades en la estacion experimental del CIANO al noroeste de Mexico. En consecuencia, las lineas seleccionadas representan una coleccion de las mejores lineas o variedades, que los colaboradores pudieron comparar en las condiciones especificas de sus propias localidades.

English. The thirteenth international barley yield trial (IBYT) was distributed in 1990 to be grown by cooperators in their spring season of 1991. 95 nurseries went to cooperators in 41 countries. The advanced lines and varieties included in the nursery had been chosen from among the best materials and nominations from plant breeders in different parts of the world. All had been grown and observed in a high yielding environment in northwester Mexico with pressure from major diseases. The selected lines thus comprised a collection of the world's best lines or varieties that cooperators could compare under the specific conditions of their own sites. Seed for this international nursery was multiplied in plots on the CIANO Experiment Station; the seed was cleaned and treated with fungicides before shipment. 38 cooperators receiving the nursery returned field books reporting performance at their locations in time to be included in this report. In receiving and processing the data, we assume that instructions were carried out and that accurate results were reported. We cannot, however, attest to the rigor with which the trials were grown and results obtained. The choice of variables measured and the data returned rests with the individual cooperator. We have included in this summary selected variables reported to us. Some are presented for which a limited number of observations were made. The user of these tables should be aware of the importance of the number of locations and the number of observations in interpreting data on a given variable; the table for results specify the guidance of the reader.