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The study was conducted at the Pastures and Forages Research Station Indio Hatuey in order to evaluate the effect of the bioproducts EcoMic® and Pectimorf® on the growth in nursery of Leucaena leucocephala cv. Cunningham. The treatments were: 1) control, 2) inoculation with EcoMic®, 3) imbibition in Pectimorf®, 4) inoculation with EcoMic® plus imbibition in Pectimorf®. A completely randomized design was used, with three replications. The evaluated variables were: emergence from the seeds, seedling height, number of branches and root length. The emergence was higher (71,43 % of seedlings emerged 35 days after seeding) in the treatment that consisted in imbibing the seeds in Pectimorf® during 16 h. The control was higher and differed significantly from the others in the variable number of branches. Regarding height, the imbibition in Pectimorf® and the control did not differ statistically, and the treatments inoculated with EcoMic® alone and its combination with Pectimorf® showed lower growth; however, these last two ones had incidence on a higher root growth of the leucaena seedlings. The imbibition in Pectimorf® during 16 h caused higher emergence from the seeds, while the treatments inoculated with EcoMic® showed the highest root growth; this indicates that it is possible to reduce the nursery period in this species. [ABSTRACT FROM AUTHOR]

Se desarrolló un experimento en el estado Trujillo, Venezuela, con el objetivo de comparar el patrón de crecimiento y la distribución de biomasa de Albizia lebbeck, Leucaena leucocephala (ecotipo Trujillo) y Erythrina fusca durante 18 semanas en vivero. Las variables estudiadas fueron: tasa de crecimiento en función de la altura (TCA) y de la distribución de la MS (TCMS), así como el porcentaje de materia seca (MS) y el peso seco por planta de las fracciones (hojas, tallo, raíz). Se utilizó un diseño completamente aleatorizado para mediciones repetidas en el tiempo y diez réplicas por especie. Erythrina presentó la mayor TCA y TCMS promedio (3,7 mm/día y 94,8 mg/día), seguida por leucaena (3,1 y 81,3) y, por último, albizia (1,2 mm/día y 53,1 mg/día), respectivamente. Independientemente de la especie, el mayor porcentaje de MS promedio se observó en las raíces (31,9), seguido por el tallo (28,0) y las hojas (25,4). Se observó una mayor distribución de MS por planta en las hojas (3,9 g) y la raíz (3,1 g), comparados con el tallo (2,9 g). Se concluye que, para estas condiciones de aviveramiento, E. fusca presentó los mejores resultados; mientras que A. lebbeck necesitaría más tiempo para alcanzar las características deseables para su trasplante a campo.A trial was conducted in the Trujillo state, Venezuela, in order to compare the growth and biomass distribution pattern of Albizia lebbeck, Leucaena leucocephala (Trujillo ecotype) and Erythrina fusca for 18 weeks in nursery. The studied variables were: growth rate related to height (GRH) and DM distribution (GRDM), as well as dry matter percentage (DM) and dry weight per plant of the fractions (leaves, stem, root). A completely randomized design for measurements repeated in time and ten replications per species were used. E. fusca showed the highest average GRH and GRDM (3,7 mm/day and 94,8 mg/day), followed by L. leucocephala (3,1 and 81,3) and, lastly, A. lebbeck (1,2 mm/day and 53,1 mg/day), respectively. In dependently from the species, the highest percentage of average DM was observed in the roots (31,9), followed by the stem (28,0) and leaves (25, 4). A higher DM distribution per plant was observed in the leaves (3,9 g) and root (3,1 g) as compared to the stem (2,9 g). It is concluded that, for these nursery conditions, E. fusca showed the best results; while A. lebbeck would need more time to reach the desirable characteristics for its transplant to the field.

Se llevó a cabo un ensayo en el estado Trujillo, Venezuela, con el objetivo de evaluar el comportamiento morfoestructural de Albizia lebbeck, Leucaena leucocephala (ecotipo Trujillo) y Erythrina fusca en condiciones de vivero. Se utilizó un diseño completamente aleatorizado para mediciones repetidas en el tiempo y diez réplicas por especie. Las variables estudiadas fueron: altura de la planta; diámetro del tallo y de las ramas; número de hojas, ramas, raíces y nódulos totales; y longitud de la rama y de la raíz. Al final de la evaluación (18 semanas) no se observaron diferencias significativas entre L. leucocephala y E. fusca en la altura de la planta (45,2 y 51,0 cm), el diámetro del tallo (0,65 y 0,78 cm), el número de hojas (43 y 45) y de ramas (17 y 18) y la longitud de la raíz (32,1 y 36,5 cm). A. lebbeck sólo se destacó en el número de raíces (61) y de nódulos totales promedio (6). Los resultados permiten concluir que con la utilización de un sustrato alcalino en vivero, L. leucocephala y E. fusca exhibieron un comportamiento morfoestructural aéreo similar y superior que el de A. lebbeck; mientras que la albizia mostró mejores resultados en la morfoestructura radical.A trial was conducted in the Trujillo state, Venezuela, in order to evaluate the morphostructural performance of Albizia lebbeck, Leucaena leucocephala (Trujillo ecotype) and Erythrina fusca under nursery conditions. A completely randomized design was used for repeated measurements in time and ten replications per species. The studied variables were: plant height; stem and branch diameter; number of leaves, branches, roots and total nodules; and branch and root length. At the end of the evaluation (18 weeks) no significant differences were observed between L. leucocephala and E. fusca in plant height (45,2 and 51,0 cm), stem diameter (0,65 and 0,78 cm), number of leaves (43 and 45) and branches (17 and 18) and root length (32,1 and 36,5 cm). A. lebbeck only stood out for the number of roots (61) and average total nodules (6). The results allow concluding that with the utilization of an alkaline substratum in nursery, L. leucocephala and E. fusca showed a similar aerial morphostructural performance and higher than that of A. lebbeck; while albizia showed better results in root morphostructure.

The objective of this study was to characterize nine Jatropha curcas provenances, collected in several provinces of Cuba, during the nursery and establishment stages. To characterize these materials the methodology for the collection and characterization of germplasm was used. In the nursery, the rooting of the propagules happened since 7 or 14 days after planting; while seedling emergence, when seeds were used, occurred 14 days after sowing. The survival percentage of the propagules fluctuated between 20 and 86,6 %, and from seed, from 86,6 to 90 %. In the field, survival varied between 66,6 and 100 % in the provenances transplanted by propagules and, in general, it was higher than the one detected in the nursery. In the provenances transplanted by seedlings no variation was detected in survival (90,9 % for the two accessions: CSSS-5 and CSS-6). It is concluded that the percentage of sprouting, emergence, rooting and survival were very variable indicators, under nursery as well as under field conditions, which was closely linked to the genotype, age and seed quality of the collected materials (propagules as well as seed). It is recommended to collect J. curcas in other zones, in order to contribute to the increase of the germplasm of this important species, which constitutes an alternative genetic resource for biofuel production. [ABSTRACT FROM AUTHOR]

In order to evaluate the growth of Trichanthera gigantea plants two experiments were conducted, the first one under nursery conditions, in which propagules with different number of nodes were used; and a second trial was carried out under field conditions, with two planting frames. In the first one a completely randomized design was used and in the second the design consisted in randomized blocks. The T. gigantea propagules with three nodes provided a higher amount of shoots per stake (6), with a higher length (4,27 cm). In the field, after 11 months, plants taller than 160 cm and with many branches were obtained. The leaves reached 24 cm long and 12 cm wide, independently from the planting frame used. In the 0,75 m2-frame, yields of 533 kg DM/ha for the leaves and of 373,0 kg DM/ha for the fresh stems were observed, which was highly significant in comparison with the 1,0 m2-frame (213 and 135 kg DM/ha for the leaves and fresh stems, respectively). It is concluded that it is possible to use stakes of T. gigantea plants with different number of nodes for the establishment in nursery, although the propagules with three nodes provided a higher amount of shoots. Likewise, the use of a 0,75 m2-plantation frame allowed to obtain higher yields in dry foliage as compared to the 1,0 m2-frame; therefore, to use propagules with three nodes and a planting frame of 0,75 m2 for the propagation of T. gigantea is recommended. [ABSTRACT FROM AUTHOR]

Se desarrolló un experimento en el estado Trujillo, Venezuela, con el objetivo de comparar el patrón de crecimiento y la distribución de biomasa de Albizia lebbeck, Leucaena leucocephala (ecotipo Trujillo) y Erythrina fusca durante 18 semanas en vivero. Las variables estudiadas fueron: tasa de crecimiento en función de la altura (TCA) y de la distribución de la MS (TCMS), así como el porcentaje de materia seca (MS) y el peso seco por planta de las fracciones (hojas, tallo, raíz). Se utilizó un diseño completamente aleatorizado para mediciones repetidas en el tiempo y diez réplicas por especie. Erythrina presentó la mayor TCA y TCMS promedio (3,7 mm/día y 94,8 mg/día), seguida por leucaena (3,1 y 81,3) y, por último, albizia (1,2 mm/día y 53,1 mg/día), respectivamente. Independientemente de la especie, el mayor porcentaje de MS promedio se observó en las raíces (31,9), seguido por el tallo (28,0) y las hojas (25,4). Se observó una mayor distribución de MS por planta en las hojas (3,9 g) y la raíz (3,1 g), comparados con el tallo (2,9 g). Se concluye que, para estas condiciones de aviveramiento, E. fusca presentó los mejores resultados; mientras que A. lebbeck necesitaría más tiempo para alcanzar las características deseables para su trasplante a campo. [ABSTRACT FROM AUTHOR]

A trial was conducted in the Trujillo state, Venezuela, in order to evaluate the morphostructural performance of Albizia lebbeck, Leucaena leucocephala (Trujillo ecotype) and Erythrina fusca under nursery conditions. A completely randomized design was used for repeated measurements in time and ten replications per species. The studied variables were: plant height; stem and branch diameter; number of leaves, branches, roots and total nodules; and branch and root length. At the end of the evaluation (18 weeks) no significant differences were observed between L. leucocephala and E. fusca in plant height (45,2 and 51,0 cm), stem diameter (0,65 and 0,78 cm), number of leaves (43 and 45) and branches (17 and 18) and root length (32,1 and 36,5 cm). A. lebbeck only stood out for the number of roots (61) and average total nodules (6). The results allow concluding that with the utilization of an alkaline substratum in nursery, L. leucocephala and E. fusca showed a similar aerial morphostructural performance and higher than that of A. lebbeck; while albizia showed better results in root morphostructure. [ABSTRACT FROM AUTHOR]

With the objective of characterizing the best-performance accessions under nursery conditions, a Leucaena spp. collection, represented by 23 accessions of five species, was evaluated. For that purpose the following elements were measured: seedling height, stem diameter and branch number, dry biomass of the aerial part, root length and dry matter, which served as indicators of the optimum transplantation moment; the seedlings were planted in 26 x 14 cm black polyethylene bags. These features were observed to have remarkable influence on plant development and when a main component analysis was applied, they showed high variability (63,10%) in the first component. Relation was found among plant height, number of leaf growths, dry biomass of the aerial part, dry root mass and root length, and for these features the following accessions stood out: L. leucocephala cv. Cunningham, cv. Peru, CIAT-9119, CIAT-9438, CIAT- 751, CIAT-7988, CIAT-7384, CIAT-7929, CIAT-17480, cv. Ipil-pil, cv. CNIA-250; L. lanceolata CIAT-17255, CIAT- 17501 and L. diversifolia CIAT-17270. It is concluded that there was variability in the collection among the species and among the accessions of each species, and that it is necessary to take into consideration the studied characteristics to define the optimum transplantation moment. [ABSTRACT FROM AUTHOR]

Con el objetivo de caracterizar las accesiones de mejor comportamiento en condiciones de vivero, se evaluó una colección de Leucaena spp., representada por 23 accesiones de cinco especies. Para ello se midió: la altura de la plántula, el grosor del tallo y el número de ramas, la biomasa seca de la parte aérea, la longitud y la masa seca de la raíz, los cuales sirvieron como indicadores del momento óptimo de trasplante; estas se sembraron en bolsas de polietileno negro, de 26 x 14 cm. Se observó que estos caracteres tuvieron marcada influencia en el desarrollo de la planta y, al aplicar un análisis de componentes principales, mostraron una gran variabilidad (63,10%) en la primera componente. Se encontró relación entre la altura de la planta, el número de brotes foliares, la biomasa seca de la parte aérea, la masa seca de la raíz y la longitud de la raíz, y para estos caracteres se destacaron las accesiones L. leucocephala cv. Cunningham, cv. Perú, CIAT-9119, CIAT-9438, CIAT-751, CIAT-7988, CIAT-7384, CIAT-7929, CIAT-17480, cv. Ipil-Ipil, cv. CNIA-250, L. lanceolata CIAT-17255, CIAT-17501 y L. diversifolia CIAT-17270. Se concluye que existió variabilidad en la colección dentro de las especies y dentro de las accesiones de cada especie, y que es necesario tomar en consideración los caracteres estudiados para definir el momento óptimo de trasplante.With the objective of characterizing the best-performance accessions under nursery conditions, a Leucaena spp. collection, represented by 23 accessions of five species, was evaluated. For that purpose the following elements were measured: seedling height, stem diameter and branch number, dry biomass of the aerial part, root length and dry matter, which served as indicators of the optimum transplantation moment; the seedlings were planted in 26 x 14 cm black polyethylene bags. These features were observed to have remarkable influence on plant development and when a main component analysis was applied, they showed high variability (63,10%) in the first component. Relation was found among plant height, number of leaf growths, dry biomass of the aerial part, dry root mass and root length, and for these features the following accessions stood out: L. leucocephala cv. Cunningham, cv. Peru, CIAT-9119, CIAT-9438, CIAT-751, CIAT-7988, CIAT-7384, CIAT-7929, CIAT-17480, cv. Ipil-pil, cv. CNIA-250; L. lanceolata CIAT-17255, CIAT-17501 and L. diversifolia CIAT-17270. It is concluded that there was variability in the collection among the species and among the accessions of each species, and that it is necessary to take into consideration the studied characteristics to define the optimum transplantation moment.