Efecto de la altura de defoliación y la fertilización N sobre la estructura, la densidad de las plantas y el desempeño productivo de pasturas de Kikuyo (Cenchrus clandestinus)

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dc.contributor.advisorCarulla Fornaguera, Juan Evangelista
dc.contributor.advisorAvellaneda Avellaneda, Yesid
dc.contributor.authorMancipe Muñoz, Edgar Augusto
dc.contributor.orcidMancipe Muñoz, Edgar Augusto [000000019831673X]spa
dc.contributor.researchgroupMicrobiologia y Nutricion animal del trópicospa
dc.date.accessioned2024-10-24T18:16:44Z
dc.date.available2024-10-24T18:16:44Z
dc.date.issued2024
dc.descriptionilustraciones, diagramas, fotografías,
dc.description.abstractEl trabajo evaluó como la intensidad de defoliación (altura residual, AR) y fertilización modifican el crecimiento, estructura, calidad y acumulación de C y N en pasturas de Kikuyo; mediante un diseño de parcelas divididas con tres repeticiones al defoliar a 5 hojas las parcelas. Defoliar a 6 cm vs 12 cm de AR redujo la relación hoja:tallo 2.5 veces (p<0.001) y aumentó el intervalo de defoliación (ID) (+8 d) y la tasa de crecimiento (TDC) (+19%). Además, aumentó la densidad de brotes (DB) y proporción de material muerto (PMM) (interacción, p<0.05), donde las pasturas más fertilizadas tuvieron menor DB y PMM. La calidad de la pastura fue similar entre AR. La cantidad de C fue inferior en la biomasa subterránea (BS) a 6 cm AR (11.2 vs 12.7 t ha-1). Aumentar la fertilización redujo el ID (-2.4 d; p<0.01); incremento la altura de la pastura (+4.7 cm; p<0.001), la TDC (+13 kgMS ha-1; p<0.001), la proteína en hojas y tallos (p<0.001) y la longitud de los estolones (141 vs 228 vs 480 cm; p<0.01). También, aumentó la acumulación de tallos al defoliar a 6 cm (6.4 vs 10.6 y 11.0 kgMS ha-1) pero no a 12 cm de AR; interacción (p<0.001). La cantidad de C en la BS fue mayor para el nivel medio de fertilización (11.2 vs 13.4 vs 11.3; p<0.05). En conclusión, las pasturas de Kikuyo mantuvieron su productividad con una AR de 6 cm aumentando la DB, pero viéndose comprometidas la altura y la relación hoja:tallo. La fertilización aumento la productividad de las pasturas y compensó los efectos de la AR. Sin embargo, estas prácticas de manejo podrían tener impactos negativos sobre la BS. (Texto tomado de la fuente)spa
dc.description.abstractThe work evaluated how the intensity of defoliation (residual height, AR) and fertilization modify the growth, structure, quality and accumulation of C and N in Kikuyu pastures; through a divided plot design with three repetitions when defoliating the plots to 5 leaves. Defoliating at 6 cm vs 12 cm HR reduced the leaf-stem ratio 2.5 times (p<0.001) and increased the defoliation interval (DI) (+8 d) and growth rate (DGR) (+19%). In addition, tiller density (TD) and proportion of dead material (PDM) increased (interaction, p<0.05), where the most fertilized pastures had lower TD and PDM. Pasture quality was similar between HR. The amount of C was lower in the underground biomass (UB) at 6 cm HR (11.2 vs 12.7 t ha-1). Increasing fertilization reduced DI (-2.4 d; p<0.01); increased pasture height (+4.7 cm; p<0.001), DGR (+13 kgDM ha-1; p<0.001), protein in leaves and stems (p<0.001) and stolon length (141 vs 228 vs 480 cm; p<0.01). Also, stem accumulation increased when defoliating at 6 cm (6.4 vs 10.6 and 11.0 kgMS ha-1) but not at 12 cm of HR; interaction (p<0.001). The amount of C in the UB was greater for the medium fertilization level (11.2 vs 13.4 vs 11.3; p<0.05). In conclusion, Kikuyu pastures maintained their productivity with an HR of 6 cm, increasing TD, but height and the leaf-stem ratio were compromised. Fertilization increased pasture productivity and offset the effects of HR. However, these management practices could have negative impacts on UB.eng
dc.description.degreelevelMaestríaspa
dc.description.degreenameMagíster en Salud Animal o Magíster en Producción Animalspa
dc.description.researchareaPastos y forrajesspa
dc.format.extent169 páginasspa
dc.format.mimetypeapplication/pdfspa
dc.identifier.instnameUniversidad Nacional de Colombiaspa
dc.identifier.reponameRepositorio Institucional Universidad Nacional de Colombiaspa
dc.identifier.repourlhttps://repositorio.unal.edu.co/spa
dc.identifier.urihttps://repositorio.unal.edu.co/handle/unal/87041
dc.language.isospaspa
dc.publisherUniversidad Nacional de Colombiaspa
dc.publisher.branchUniversidad Nacional de Colombia - Sede Bogotáspa
dc.publisher.facultyFacultad de Medicina Veterinaria y de Zootecniaspa
dc.publisher.placeBogotá, Colombiaspa
dc.publisher.programBogotá - Medicina Veterinaria y de Zootecnia - Maestría en Salud y Producción Animalspa
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dc.rights.accessrightsinfo:eu-repo/semantics/openAccessspa
dc.rights.licenseAtribución-NoComercial-SinDerivadas 4.0 Internacionalspa
dc.rights.urihttp://creativecommons.org/licenses/by-nc-nd/4.0/spa
dc.subject.ddc630 - Agricultura y tecnologías relacionadas::636 - Producción animalspa
dc.subject.proposalAcumulación Cspa
dc.subject.proposalDensidad brotesspa
dc.subject.proposalEstolónspa
dc.subject.proposalIntensidad defoliaciónspa
dc.subject.proposalPrácticas de manejospa
dc.subject.proposalRizomaspa
dc.subject.proposalAccumulation Ceng
dc.subject.proposalDefoliation intensityeng
dc.subject.proposalManagement practiceseng
dc.subject.proposalRhizomeeng
dc.subject.proposalShoot densityeng
dc.subject.proposalStoloneng
dc.subject.wikidataCenchrus clandestinus
dc.subject.wikidataCenchrus setaceus
dc.subject.wikidataKikuyu grass
dc.subject.wikidataPurple fountain grass
dc.titleEfecto de la altura de defoliación y la fertilización N sobre la estructura, la densidad de las plantas y el desempeño productivo de pasturas de Kikuyo (Cenchrus clandestinus)spa
dc.title.translatedEffect of defoliation height and nitrogen fertilization on plant structure and nutritional quality of Kikuyu grass pastures (Cenchrus clandestinus)eng
dc.typeTrabajo de grado - Maestríaspa
dc.type.coarhttp://purl.org/coar/resource_type/c_bdccspa
dc.type.coarversionhttp://purl.org/coar/version/c_ab4af688f83e57aaspa
dc.type.contentTextspa
dc.type.driverinfo:eu-repo/semantics/masterThesisspa
dc.type.redcolhttp://purl.org/redcol/resource_type/TMspa
dc.type.versioninfo:eu-repo/semantics/acceptedVersionspa
dcterms.audience.professionaldevelopmentBibliotecariosspa
dcterms.audience.professionaldevelopmentEstudiantesspa
dcterms.audience.professionaldevelopmentInvestigadoresspa
dcterms.audience.professionaldevelopmentMaestrosspa
oaire.accessrightshttp://purl.org/coar/access_right/c_abf2spa
oaire.fundernameMinisterio de Agricultura y Desarrollo Ruralspa
oaire.fundernameCorporación Colombiana de Investigación Agropecuaria - AGROSAVIAspa

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