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Effects of defoliation frequency and nitrogen fertilization on the production and potential for persistence of Dactylis glomerata sown in multispecies swards

Colaborador(es): Gatti, María Laura Amalia. Cátedra de Forrajicultura, Departamento de Producción Animal, Facultad de Agronomía, Universidad de Buenos Aires, Buenos Aires, Argentina. E-mail: mgatti@agro.uba.ar | Ayala Torales, A. T. Cátedra de Forrajicultura, Departamento de Producción Animal, Facultad de Agronomía, Universidad de Buenos Aires, Buenos Aires, Argentina | Cipriotti, Pablo Ariel. Departamento de Métodos Cuantitativos y Sistemas de Información, Facultad de Agronomía, Universidad de Buenos Aires, Buenos Aires, Argentina; Instituto de Investigaciones Fisiológicas y Ecológicas vinculadas a la Agricultura (IFEVA, UBA-CONICET), Ciudad Autónoma de Buenos Aires, Buenos Aires, Argentina | Golluscio, Rodolfo Angel. Cátedra de Forrajicultura, Departamento de Producción Animal, Facultad de Agronomía, Universidad de Buenos Aires, Buenos Aires, Argentina; Instituto de Investigaciones Fisiológicas y Ecológicas vinculadas a la Agricultura (IFEVA, UBA-CONICET), Ciudad Autónoma de Buenos Aires, Buenos Aires, Argentina.
ISSN: 0142-5242.Tipo de material: Artículos y capítulos. Recurso electrónico.Tema(s): OPTIMAL DEFOLIATION | FREQUENCY | LEAF STAGE | BROMUS WILLDENOWII KUNTH | TILLERING | ROOT BIOMASS | Recursos en línea: Haga clic para acceso en línea | LINK AL EDITOR En: Grass and forage science Vol.72, no.3 (2016), p.489-501, grafs., tbls.Resumen: Management decisions should facilitate the dominance of C 3 perennial grasses over annuals. This study examined the effects of defoliation frequencies and nitrogen fertilization on the productivity and potential for per- sistence of Dactylis glomerata L. (DG cocksfoot, perennial) in multispecies swards. Treatments were randomly applied to 24 mini-swards of DG + Bromus willdenowii Kunth (BW prairie grass, annual/biennial) in a factorial design of four defoliation frequencies, based on number of leaves per tiller, by two nitrogen winter fertilization levels (N À or N + ). Regardless of fertilization, very frequent and repeated defoliations were related to decreases of about 43% of aboveground bio- mass and frequent defoliations with decreases of about 44% of vegetative tillers associated with horizontal space occupation and potential for persistence. Nevertheless, differences in DG aerial productivity or reserves were not detected between frequent and optimal defoliation frequencies. Combined effects of N + and optimal frequency were related to root biomass increment of about 200%, compared with frequent defoliation, associated with competitiveness and survival of DG. Optimal defoliation frequency would have ecological but not production advantages, compared with frequent defoliations. The results are discussed in terms of more objective decision making in the management of multispecies swards.
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Management decisions should facilitate the dominance of C 3 perennial grasses over annuals. This study examined the effects of defoliation frequencies and nitrogen fertilization on the productivity and potential for per- sistence of Dactylis glomerata L. (DG cocksfoot, perennial) in multispecies swards. Treatments were randomly applied to 24 mini-swards of DG + Bromus willdenowii Kunth (BW prairie grass, annual/biennial) in a factorial design of four defoliation frequencies, based on number of leaves per tiller, by two nitrogen winter fertilization levels (N À or N + ). Regardless of fertilization, very frequent and repeated defoliations were related to decreases of about 43% of aboveground bio- mass and frequent defoliations with decreases of about 44% of vegetative tillers associated with horizontal space occupation and potential for persistence. Nevertheless, differences in DG aerial productivity or reserves were not detected between frequent and optimal defoliation frequencies. Combined effects of N + and optimal frequency were related to root biomass increment of about 200%, compared with frequent defoliation, associated with competitiveness and survival of DG. Optimal defoliation frequency would have ecological but not production advantages, compared with frequent defoliations. The results are discussed in terms of more objective decision making in the management of multispecies swards.

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