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Registro Completo |
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Biblioteca(s): |
Embrapa Agrobiologia. |
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Data corrente: |
09/11/2021 |
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Data da última atualização: |
09/11/2021 |
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Tipo da produção científica: |
Artigo em Periódico Indexado |
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Autoria: |
DEPABLOS, L.; HOMEM, B. G. C.; FERREIRA, I. M.; BERNARDES, T. F.; BODDEY, R. M.; LARA, M. A. S.; CASAGRANDE, D. R. |
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Afiliação: |
LUIS DEPABLOS, UNIVERSIDAD CENTRAL DE VENEZUELA; BRUNO G. C. HOMEM, UFLA; IGOR M. FERREIRA, UFLA; THIAGO F. BERNARDES, UFLA; ROBERT MICHAEL BODDEY, CNPAB; MÁRCIO A. S. LARA, UFLA; DANIEL R. CASAGRANDE, UFLA. |
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Título: |
Nitrogen cycling in tropical grass-legume pastures managed under canopy light interception. |
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Ano de publicação: |
2021 |
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Fonte/Imprenta: |
Nutrient Cycling in Agroecosystems, V. 121,p. 51-67, 2021. |
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ISSN: |
1385-1314 |
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DOI: |
https://doi.org/10.1007/s10705-021-10160-7 |
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Idioma: |
Inglês |
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Conteúdo: |
In 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. MenosIn 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... Mostrar Tudo |
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Palavras-Chave: |
BNF; Efoliation frequency; Marandu palisadegrass. |
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Thesagro: |
Capim Urochloa. |
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Thesaurus Nal: |
Excreta. |
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Categoria do assunto: |
P Recursos Naturais, Ciências Ambientais e da Terra |
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Marc: |
LEADER 02532naa a2200277 a 4500
001 2135955
005 2021-11-09
008 2021 bl uuuu u00u1 u #d
022 $a1385-1314
024 7 $ahttps://doi.org/10.1007/s10705-021-10160-7$2DOI
100 1 $aDEPABLOS, L.
245 $aNitrogen cycling in tropical grass-legume pastures managed under canopy light interception.$h[electronic resource]
260 $c2021
520 $aIn 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.
650 $aExcreta
650 $aCapim Urochloa
653 $aBNF
653 $aEfoliation frequency
653 $aMarandu palisadegrass
700 1 $aHOMEM, B. G. C.
700 1 $aFERREIRA, I. M.
700 1 $aBERNARDES, T. F.
700 1 $aBODDEY, R. M.
700 1 $aLARA, M. A. S.
700 1 $aCASAGRANDE, D. R.
773 $tNutrient Cycling in Agroecosystems, V. 121,p. 51-67, 2021.
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Embrapa Agrobiologia (CNPAB) |
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| 2. |  | TAVARES-DIAS, M.; SILVA, C. A.; CORREA, R. de O.; MARTINS JUNIOR, H.; YOSHIOKA, E. T. O.; ARAUJO, J. da C.; RODRIGUES, L. A.; FOGACA, F. H. dos S. Boas práticas para a produção de tambaqui em tanques-rede: da implantação à despesca. Macapá: Embrapa Amapá, 2018. 30 p. (Embrapa Amapá. Comunicado técnico, 152). Autoria na publicação: Fabíola Helena dos Santos Fogaça.| Tipo: Comunicado Técnico/Recomendações Técnicas |
| Biblioteca(s): Embrapa Agroindústria de Alimentos; Embrapa Amapá; Embrapa Amazônia Oriental; Embrapa Meio-Norte; Embrapa Tabuleiros Costeiros. |
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