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handle: 10261/59864
[EN] The possibilities of rooting chestnut cuttings are studied through experiments carried out with soft and hard cuttings, employing some growth promoting substances. As rooting media quartz and river sand were employed, and electric heating in the bottom of them was used to keep the desired temperature. Soft cuttings may respond positively during October or November when treated with some of the following 4 mg/g IAA + 4 mg/g NAA; 8 mg/g NAA; 4 mg/g IBA + 4 mg/g NAA;.8 mg/g NAA; 8 mg/g IBA; 12 mg/g IBA, y 1OO ppm IAA + :100 ppm ANA. The higher treatments were effective for only the more vigorous cuttings. Not a positive response was induced during any other months except those mentioned. Most cuttings which rooted did not form callus at their bases the first sign of a positive reaction was a swelling above the basal end. Roots formed were always very tender, only a few appeared on each cutting and these decayed very easily when the moisture content of the rooting medium was not correct; therefore the practical application of these treatments depends largely on physical conditions; i. e. on correct temperature and moisture control of the rooting medium.
[ES] Se hace un estudio de la posibilidad de inducir la formación de raíces en estacas de castaño blandas y duras con ayuda de diversas sustancias de acción hormonal en •cámaras de enraizamiento de arena de cuarzo y de río con la temperatura controlada. Las estacas responden positivamente a los siguientes tratamientos: 4 mg/g AIA + 4 mg/g ANA; 8 mg/g ANA; 4 mg/g AIB + 4 mg/g ANA;.8 mg/g ANA; 8 mg/g AIB; 12 mg/g AIB, y 1OO ppm AIA + :100 ppm ANA, durante los meses de octubre y noviembre. En los restantes meses, prácticamente no se obtuvo respuesta positiva. La distinta concentración de los tratamientos estudiados depende del vigor de la estaca. En la mayoría de los enraizamientos obtenidos no se observó la formación de callo basal, siendo el primer síntoma de respuesta positiva la aparición de un hinchamiento. Las raíces formadas fueron tiernas y muy sensibles a un exceso de humedad en el medio de enraizamiento, pudriéndose con extrema facilidad, lo que constituye un inconveniente para su aplicación práctica.
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