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Search Results: 1 - 10 of 787 matches for " Yuseika Olivera "
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Evaluación agronómica y selección de accesiones de Teramnus spp.
Olivera,Yuseika;
Pastos y Forrajes , 2011,
Abstract: a teramnus spp. collection was studied for a year with the objective of evaluating and selecting the most outstanding accessions of this germplasm. the work was done in 3 x 1 m plots, with space between rows of 2 m, which plants had been established since a previous study. in order to obtain the variability and the relationship among variables, a principal component analysis (pca) was performed; while for grouping the treatments with similar characteristics, regarding the measured and estimated variables, a graphic was made through the result of the pca. the existence of 76,85% of total variability was observed, based on plant height, leafiness, cover, vigor and yield, and the formation of seven groups was identified. it is concluded that there was an acceptable performance of the accessions and those in group ii stood out, mainly t. labialis ciat-926, ciat-21197 and ciat-9128, for which it would be advisable to insert them in the varietal flow and compare them to commercial accessions.
Evaluación agronómica y selección de accesiones de Teramnus spp. Agronomic evaluation and selection of Teramnus spp. accessions
Yuseika Olivera
Pastos y Forrajes , 2011,
Abstract: Se estudió durante un a o una colección de Teramnus spp. con el objetivo de evaluar y seleccionar las accesiones más sobresalientes de este germoplasma. Se trabajó en parcelas de 3 x 1 m, con separación en las calles de 2 m, cuyas plantas estaban establecidas de un estudio previo. Para obtener la variabilidad y la relación entre las variables, se realizó un análisis de componentes principales (ACP); mientras que para agrupar los tratamientos con características semejantes, en función de las variables medidas y estimadas, se graficó mediante el resultado del ACP. Se constató la existencia de un 76,85% de variabilidad total, sobre la base de la altura de la planta, la hojosidad, la cobertura, el vigor y el rendimiento, y se identificó la formación de siete grupos. Se concluye que hubo un comportamiento aceptable de las accesiones y sobresalieron las del grupo II, principalmente T. labialis CIAT-926, CIAT-21197 y CIAT-9128, por lo que sería recomendable insertarlas en el flujo varietal y compararlas con las accesiones comerciales. A Teramnus spp. collection was studied for a year with the objective of evaluating and selecting the most outstanding accessions of this germplasm. The work was done in 3 x 1 m plots, with space between rows of 2 m, which plants had been established since a previous study. In order to obtain the variability and the relationship among variables, a principal component analysis (PCA) was performed; while for grouping the treatments with similar characteristics, regarding the measured and estimated variables, a graphic was made through the result of the PCA. The existence of 76,85% of total variability was observed, based on plant height, leafiness, cover, vigor and yield, and the formation of seven groups was identified. It is concluded that there was an acceptable performance of the accessions and those in group II stood out, mainly T. labialis CIAT-926, CIAT-21197 and CIAT-9128, for which it would be advisable to insert them in the varietal flow and compare them to commercial accessions.
Caracterización morfológica de una colección de Teramnus spp.
Machado,R; Olivera,Yuseika;
Pastos y Forrajes , 2008,
Abstract: the objective of this work was to characterize a collection of teramnus spp. formed by 50 accessions from the ciat, colombia. for that international descriptors for forage legumes and other descriptors of interest (32 in total, quantitative and qualitative) were taken into consideration. the seed of each accession, was planted in 12 niches in simple 3 x 1 m plots and a stake was placed to allow them their highest growth and development. the measurements and observations were carried out when the plants reached the phenohase of green to ripe seed. the application of the main component analysis allowed to prove the existence of a relatively high variability for all the characters, because the total only reached 67,7% in the first eight components; the quantitative descriptors stood out, with 51,8% in the first five components. the grouping of the accessions based on the foliar dimensions and number of seeds, through a cluster analysis, allowed the formation of five contrasting groups; two accessions of t. labialis (ciat-927 and ciat-9007) were distinguished, in which these characters were maximized with regards to the others of these species; while 62,0% of this collection was represented by phenotypes with short leaves, short and narrow folioles, short petioles and a number of seeds per pod that did not exceed a mean higher than 8. it is concluded that the characterization allowed to prove the relative variability of its components, although it is widened with regards to the existing germplasm in the country for species of this genus and, on the other hand, it increases the germplasm considerably. the evaluation of the agroproductive potentials of interest, with selective objectives, is recommended.
Evaluación y selección de accesiones en una colección de Teramnus spp: Etapa de establecimiento.
Olivera,Yuseika; Olivares,J;
Pastos y Forrajes , 2009,
Abstract: a collection of 50 teramnus spp. accessions was evaluated, with the objective of selecting those with better performance during the establishment stage. the study was conducted at the eepf ?indio hatuey?, on a compacted ferralitic red soil. for that this stage was divided in two phases, the first one corresponded to monitoring during the time the plants were kept in bags and the second phase since they were transferred to the field until such stage was completed; in this second phase cover was estimated every 15 days and the following scale was used: 1= 10-20% covered area (very little covered), 2= 21-40% covered area (little covered), 3= 41-60% covered area (partially covered), 4= 61-80% covered area (covered) and 5= >80% area covered (well covered). when monitoring in the fist stage of establishment it was observed that 98% was sown in bags (49 accessions), because seed was not obtained from one of them; from these accessions only 67,3% (33 accessions) could be transferred to the field, because the rest (16 accessions) died before reaching the height established for that purpose. from the plants transferred to the field five died during the first 15 days of evaluation, for which 28 remained. from them, 67,8% (19 accessions) showed the best cover values during the establishment, for which to perform their evaluation during the exploitation stage is recommended.
Evaluación y selección de accesiones en una colección de Teramnus spp: Etapa de establecimiento. Evaluation and selection of accessions in a Teramnus spp. collection.: Establishment stage
Yuseika Olivera,J Olivares
Pastos y Forrajes , 2009,
Abstract: Se evaluó una colección de 50 accesiones de Teramnus spp, con el objetivo de seleccionar las de mejor comportamiento durante la etapa de establecimiento. El estudio se realizó en la EEPF Indio Hatuey , en un suelo Ferralítico Rojo compactado. Para ello se dividió esta etapa en dos fases, la primera correspondió al monitoreo durante el tiempo que estuvieron las plantas en bolsas y la segunda desde que se pasaron a campo hasta que se completó dicha etapa; en esta segunda fase se estimó cada 15 días la cobertura y se utilizó la siguiente escala: 1= 10-20% de área cubierta (muy poco cubierta), 2= 21-40% de área cubierta (poco cubierta), 3= 41-60% de área cubierta (parcialmente cubierta), 4= 61-80% de área cubierta (cubierta) y 5= > 80% de área cubierta (bien cubierta). Al realizar el monitoreo en la primera fase del establecimiento se constató que se sembraron en bolsas el 98% (49 accesiones), ya que de una no se obtuvo semilla; de estas accesiones solo fue posible pasar a campo el 67,3% (33 accesiones), ya que el resto (16 accesiones) murieron antes que alcanzaran el tama o establecido para ello. De las pasadas a campo cinco murieron durante los primeros 15 días de evaluación, por lo que se mantuvieron 28. De estas, el 67,8% (19 accesiones) mostraron los mejores valores de cobertura durante el establecimiento, por lo que se recomienda realizar su evaluación durante la fase de explotación. A collection of 50 Teramnus spp. accessions was evaluated, with the objective of selecting those with better performance during the establishment stage. The study was conducted at the EEPF Indio Hatuey , on a compacted Ferralitic Red soil. For that this stage was divided in two phases, the first one corresponded to monitoring during the time the plants were kept in bags and the second phase since they were transferred to the field until such stage was completed; in this second phase cover was estimated every 15 days and the following scale was used: 1= 10-20% covered area (very little covered), 2= 21-40% covered area (little covered), 3= 41-60% covered area (partially covered), 4= 61-80% covered area (covered) and 5= >80% area covered (well covered). When monitoring in the fist stage of establishment it was observed that 98% was sown in bags (49 accessions), because seed was not obtained from one of them; from these accessions only 67,3% (33 accessions) could be transferred to the field, because the rest (16 accessions) died before reaching the height established for that purpose. From the plants transferred to the field five died during the first 15 days of evaluation,
Caracterización morfológica de una colección de Teramnus spp. Morphological characterization of a collection of Teramnus spp.
R Machado,Yuseika Olivera
Pastos y Forrajes , 2008,
Abstract: El objetivo de este trabajo fue caracterizar una colección de Teramnus spp. formada por 48 accesiones procedentes del CIAT, Colombia; para ello se tomaron en consideración descriptores internacionales para leguminosas forrajeras y otros descriptores de interés (32 en total, cuantitativos y cualitativos). La semilla de cada accesión se sembró en 12 nichos, en parcelas sencillas de 3 x 1 m y se les colocó un tutor que les permitiera el máximo crecimiento y desarrollo. Las mediciones y observaciones se realizaron cuando las plantas alcanzaron la fenofase de semilla verde a madura. La aplicación del Análisis de Componentes Principales permitió comprobar la existencia de una variabilidad relativamente alta para todos los caracteres, ya que el acumulado solo alcanzó el 67,7% en las ocho primeras componentes; se destacaron los descriptores cuantitativos, con un 51,8% en las primeras cinco componentes. La agrupación de las accesiones sobre la base de las dimensiones foliares y el número de semillas, a través de un Análisis de Conglomerados, permitió la formación de cinco grupos contrastantes; se distinguieron dos accesiones de T. labialis (CIAT-927 y CIAT-9007), en las que se maximizaron estos caracteres en relación con las restantes de esta especie; mientras que el 62,0% de esta colección estuvo representada por fenotipos con hojas cortas, foliolos cortos y angostos, peciolos cortos y un número de semillas por legumbre que no rebasó una media superior a 8. Se concluye que la caracterización permitió comprobar la relativa variabilidad de sus componentes, aun cuando esta se amplía con relación al germoplasma existente en el país para especies de este género y, por otra parte, lo incrementa considerablemente. Se sugiere la evaluación de las potencialidades agroproductivas de interés, con fines selectivos. The objective of this work was to characterize a collection of Teramnus spp. formed by 50 accessions from the CIAT, Colombia. For that international descriptors for forage legumes and other descriptors of interest (32 in total, quantitative and qualitative) were taken into consideration. The seed of each accession, was planted in 12 niches in simple 3 x 1 m plots and a stake was placed to allow them their highest growth and development. The measurements and observations were carried out when the plants reached the phenohase of green to ripe seed. The application of the Main Component Analysis allowed to prove the existence of a relatively high variability for all the characters, because the total only reached 67,7% in the first eight components; the quantitative
Efecto de diferentes métodos de escarificación en la emergencia de semillas frescas de Samanea saman (algarrobo)
Gómez,I; Olivera,Yuseika; Botello,A;
Pastos y Forrajes , 2009,
Abstract: with the objective of evaluating the effect of different scarification alternatives on the germination of fresh seeds from samanea saman, a study was conducted under natural field conditions on a fluvisol soil, during the second quarter of the year (april-june). a randomized block design with four replications was used and the treatments were: t0 - untreated seed, t1 - immersion in boiling water for 5 minutes, t2 - immersion in boiling water during 10 minutes, t3 - immersion in boiling water for 15 minutes, t4 - immersion in water at room temperature for 24 hours, t5 - immersion in water at room temperature during 48 hours and t6 - immersion in water at room temperature during 72 hours. treatments t3 and t4, without significantly differing from each other, showed the highest effect on seed emergence, with values higher than 67%. on the other hand, germination rate was higher between 6 and 20 days after planting, which shows the possibility of using both treatments to break the initial dormancy of the seeds from this species. it is concluded that the best treatments were the immersion of seeds in boiling water during 15 minutes and the immersion in water at room temperature for 24 hours, for which their utilization in s. saman seeds is recommended.
Colecta de leguminosas forrajeras en tres provincias orientales de Cuba
Olivera,Yuseika; Machado,R; Fung,Carmen;
Pastos y Forrajes , 2008,
Abstract: a prospecting and collection work was carried out in the eastern zone of the country with the objective of collecting germplasm of herbaceous, shrubby and tree multipurpose legumes to be used in the livestock production sector. the trip included the northern and southern coast of the guantanamo province, the northern and central coast of the holguín province, as well as the central-eastern part of the granma province. an individual sampling system was used in small populations, with repetitiveness of species in different sites, and sometimes random sampling was performed in abundant populations. the information was gathered through the descriptors related to location, natural habitat, vegetation, soil and damage caused by insects and diseases, etc. ninety-five accessions belonging to 24 species were collected, among which stood out those of herbaceous type (10 genera). herbaceous as well as shrubby and tree species used with different purposes were found (animal feed, cover, green manure, living fences, etc.). it is recommended to clean the samples obtained; proceed to their fast reproduction, morphobotanical characterization and agronomic evaluation (stage i); use this material for different purposes, among them conservation and exchange; as well as to continue the collection in other zones of the country.
Creación de una metodología de claves interactivas a partir de la reconstrucción de claves analíticas publicadas
Yepes,I. A; Machado,R; Olivera,Yuseika;
Pastos y Forrajes , 2010,
Abstract: the objective of this work was to create a methodology of interactive keys from the reconstruction of published text keys. the general key of the book "árboles de cuba" (trees from cuba), in which the technique of building text keys through the traditional method is explained, was used as a model; in this book there are important tree and shrub genetic resources for forage and other usages, which served as basis. the text processor microsoft office word 2003 was used. many bibliographic materials were also reviewed, giving access to wide information about tree and shrub taxa for forage and other usages, which was compiled and arranged. the use of this methodology facilitates the completion of the bothersome table work presupposed by the use of keys built by the traditional method. it allows developing skills in the identification and characterization of plant resources and it can be used to reconstruct interactive keys of other biological groups dichotomously classified. the consultation of this material is recommended to all those specialists who are related to the activities of identification and characterization of plant biodiversity or other living beings; it is also recommended to edit the reconstructed keys for tree and shrub genetic resources for forage and other usages; as well as to create specialized software from reconstructed interactive keys based on this methodology.
Creación de una metodología de claves interactivas a partir de la reconstrucción de claves analíticas publicadas Creation of a methodology of interactive keys from the reconstruction of published analytical keys
I. A Yepes,R Machado,Yuseika Olivera
Pastos y Forrajes , 2010,
Abstract: El presente trabajo tuvo como objetivo crear una metodología de claves interactivas a partir de la reconstrucción de claves de texto publicadas. Se utilizó, como modelo, la clave general del libro "árboles de Cuba", en el que se explica la técnica de construcción de claves de texto por el método tradicional; en él aparecen importantes recursos fitogenéticos arbóreos y arbustivos forrajeros y con otros usos, los cuales sirvieron de base. Se utilizó el procesador de texto Microsoft Office Word 2003. Se revisaron, además, numerosos materiales bibliográficos que permitieron acceder a una amplia información sobre los taxones arbóreos, arbustivos forrajeros y con otros usos, la que fue compilada y ordenada. El uso de esta metodología facilita la consecución del engorroso trabajo de mesa que presupone el uso de claves construidas por el método tradicional. Permite desarrollar habilidades en la identificación y caracterización de los recursos vegetales y puede utilizarse para reconstruir claves interactivas de otros grupos biológicos clasificados dicotómicamente. Se recomienda la consulta de este material a todos aquellos especialistas que estén relacionados con las actividades de identificación y caracterización de la biodiversidad vegetal u otros seres vivos; editar las claves reconstruidas para los recursos fitogenetéticos arbóreos y arbustivos forrajeros y de otros usos; así como crear software especializados a partir de claves interactivas reconstruidas sobre la base de esta metodología. The objective of this work was to create a methodology of interactive keys from the reconstruction of published text keys. The general key of the book "árboles de Cuba" (Trees from Cuba), in which the technique of building text keys through the traditional method is explained, was used as a model; in this book there are important tree and shrub genetic resources for forage and other usages, which served as basis. The text processor Microsoft Office Word 2003 was used. Many bibliographic materials were also reviewed, giving access to wide information about tree and shrub taxa for forage and other usages, which was compiled and arranged. The use of this methodology facilitates the completion of the bothersome table work presupposed by the use of keys built by the traditional method. It allows developing skills in the identification and characterization of plant resources and it can be used to reconstruct interactive keys of other biological groups dichotomously classified. The consultation of this material is recommended to all those specialists who are related to the activi
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