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dc.creatorDepablos, Luis-
dc.creatorHomem, Bruno G. C.-
dc.creatorFerreira, Igor M.-
dc.creatorBernardes, Thiago F.-
dc.creatorBoddey, Robert M.-
dc.creatorLara, Márcio A. S.-
dc.creatorCasagrande, Daniel R.-
dc.date.accessioned2021-12-30T19:53:41Z-
dc.date.available2021-12-30T19:53:41Z-
dc.date.issued2021-
dc.identifier.citationDEPABLOS, L. et al. Nitrogen cycling in tropical grass-legume pastures managed under canopy light interception. Nutrient Cycling in Agroecosystems, Dordrecht, v. 121, p. 51-67, 2021. DOI: 10.1007/s10705-021-10160-7.pt_BR
dc.identifier.urihttps://doi.org/10.1007/s10705-021-10160-7pt_BR
dc.identifier.urihttp://repositorio.ufla.br/jspui/handle/1/48764-
dc.description.abstractIn grass-legume pastures, grazing management strategies are an essential factor affecting nitrogen (N) cycling. This study assessed the impact of grazing management on N cycling in rotationally-stocked mixed pastures of ‘Marandu’ palisadegrass (Brachiaria brizantha) and ‘Comum’ calopo (Calopogonium mucunoides). Treatments included three grazing management strategies, defined by interruption of the rest period when the canopy reached 90 (90LI), 95 (95LI) and 100% (100LI) of the interception of photosynthetically active radiation. A 2-yr experimental period was adopted. Plant litter responses, forage intake and livestock excretion were evaluated. No differences between grazing management were obtained for existing (294 g OM m−2) and deposited litter (6.7 g OM m−2 d−1, P > 0.10). Compared to the dry season, the litter decomposition rate increased 24.0%, and the half-life decreased 37.8% in the rainy season (P < 0.10). The N cycling via litter (553 g ha−1 d−1) was similar in all grazing management (P > 0.10). Less frequent defoliation (100LI) resulted in reduced proportion of legume intake (P < 0.10, 94.4 vs. 168.5 g kg−1; an average of 90LI and 95LI, respectively), lower N intake (123.1 vs. 194.1 g animal unit−1 d−1) and a lower input of N from biological fixation (73.2 vs. 97.8 kg ha−1 yr−1). Less frequent defoliation should be avoided because it reduces the N intake and N retained by animals, which caused a reduction in N utilisation efficiency by heifers. Thus, 95% light interception is the maximum limit to interrupt the regrowth in palisadegrass-calopo pastures.pt_BR
dc.languageen_USpt_BR
dc.publisherSpringerpt_BR
dc.rightsrestrictAccesspt_BR
dc.sourceNutrient Cycling in Agroecosystemspt_BR
dc.subjectBiological nitrogen fixationpt_BR
dc.subjectBrachiariapt_BR
dc.subjectCalopogoniumpt_BR
dc.subjectGrazing management strategiespt_BR
dc.subjectLitter dynamicspt_BR
dc.subjectLivestock excretionpt_BR
dc.subjectFixação biológica de nitrogêniopt_BR
dc.subjectEstratégias de manejo de pastoreiopt_BR
dc.subjectDinâmica da ninhadapt_BR
dc.subjectExcreção de gadopt_BR
dc.titleNitrogen cycling in tropical grass-legume pastures managed under canopy light interceptionpt_BR
dc.typeArtigopt_BR
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