[en] The performance of 10 progenies of J. regia and two Juglans commercial hybrids (Ng23 x Ra and Mj209xRa) at two planting sites, Massanes (Girona) and Prades (Tarragona), which was monitored during 6 consecutive years starting in1995, is here described. Based on differences in height growth rate, three well-defined genotypic groups could be established: 1) genotypes with an average growth of up to 60 cm per year, which comprises the two commercial hybrids; 2) genotypes with an average growth of about 50 cm per year, which includes those J. regia flushing before April 20; and 3) genotypes with an average growth less than 40 cm per year, which corresponds to J. regia progenies flushing after April 20. Growth evolution over time for height and diameter was significantly affected by the location, while progeny ranking was similar for both traits at both sites. Trunk diameter at 2,50 m at the sixth growing season depended on planting site and genotype. Thus, the largest diameters at 2,50 m always appeared in Massanes, regardless of the genotype, whereas the hybrid progenies showed an advantage in diameter of about twice the value for the best J. regia at both Massanes and Prades. Apical dominance and stem form were mostly dependent on genotype. Accordingly, only two J. regia showed an acceptable forest aptitude, that is, two Italian provenances namely "Bleggiana" and "Boschi Maria Grazia". Overall, the commercial hybrids Ng23xRa and Mj209xRa exhibited a better agroforestry behaviour than the J. regia genotypes studied: less orchard mortality, better primary and secondary growth, and more suitable apical dominance and stem form.

[es] El comportamiento agroforestal de 10 genotipos de J. regia y dos h&iacute;bridos comerciales de Juglans, Ng23xRa y Mj209xRa, se ha evaluado desde 1995 a 2000 en dos localidades: Massanes (Girona) y Prades (Tarragona). Se establecen tres grupos de genotipos diferenciados de acuerdo a su tasa de crecimiento en altura: 1) crecimiento medio superior a 60 cm/a&ntilde;o, que corresponde a los dos h&iacute;bridos; 2) crecimiento medio de unos 50 cm/a&ntilde;o, que corresponde a las progenies de J. regia con brotaciones anteriores al 20 de abril; y 3) crecimiento medio inferior a los 40 cm/a&ntilde;o, que corresponde a los genotipos de J. regia con brotaci&oacute;n posterior al 20 de abril. La evoluci&oacute;n de las progenies en altura y di&aacute;metro est&aacute; significativamente ligada a la localidad. El orden en la clasificaci&oacute;n de las progenies por su crecimiento, en altura y en grosor, es pr&aacute;cticamente id&eacute;ntico en ambas localidades. El di&aacute;metro a 2,50 m, al sexto per&iacute;odo vegetativo, presenta una dependencia significativa de localidad y genotipo: en Massanes se alcanza un mayor crecimiento que en Prades y el di&aacute;metro a 2,50 m de los h&iacute;bridos es el doble que el del mejor J. regia. La dominancia y la rectitud dependen de los genotipos. S&oacute;lo dos J. regia tienen una aptitud forestal aceptable, concretamente dos genotipos italianos, &laquo;Bleggiana&raquo; y &laquo;Boschi Maria Grazia&raquo;. Los h&iacute;bridos Ng23xRa y Mj209xRa presentan un mejor comportamiento agroforestal que los genotipos de J. regia estudiados: menor mortalidad en plantaci&oacute;n, superiores crecimientos primario y secundario y buena dominancia apical y rectitud.