| Texto completo | |
| Autor(es): Mostrar menos - |
Ongaratto, Fernando
[1]
;
da Rocha Fernandes, Marcia Helena Machado
[1]
;
Dallantonia, Erick Escobar
[1]
;
Lima, Lais de Oliveira
[1]
;
do Val, Guilherme Alves
[1]
;
Cardoso, Abmael da Silva
[1]
;
Rigobello, Izabela Larosa
[1]
;
Americo Campos, Jorge Augusto
[1]
;
Reis, Ricardo Andrade
[1]
;
Ruggieri, Ana Claudia
[1]
;
Malheiros, Euclides Braga
[2]
Número total de Autores: 11
|
| Afiliação do(s) autor(es): | [1] Sao Paulo State Univ, UNESP, Dept Anim Sci, Campus Jaboticabal, BR-14884900 Jaboticabal, SP - Brazil
[2] Sao Paulo State Univ, UNESP, Dept Engn & Exact Sci, Campus Jaboticabal, BR-14884900 Jaboticabal, SP - Brazil
Número total de Afiliações: 2
|
| Tipo de documento: | Artigo Científico |
| Fonte: | AGRONOMY-BASEL; v. 11, n. 9 SEP 2021. |
| Citações Web of Science: | 0 |
| Resumo | |
Pasture intensification through higher stocking rates, nitrogen fertilization and intensified grazing management in beef cattle production optimizes pasture use by increasing the forage harvested. We aimed to assess its effects on the morphogenesis and canopy structure of Urochloa brizantha `Marandu' (marandu palisadegrass) pastures. The treatments consisted of marandu palisadegrass pastures managed under continuous stocking and a canopy height of 25 cm, with different levels of intensification: extensive, semi-intensive, and intensive systems N-fertilized with 0 kg, 75 kg, and 150 kg N ha(-1) year(-1), respectively, as ammonium nitrate (32% of N), with four replicates (paddocks) in a completely randomized design. Phyllochron (9.8 days) and leaf lifespan (34.7 days) were shorter in intensified pastures, whereas herbage mass was similar among treatments. Extensive pastures had a higher proportion of senescent material; thus, more intensive systems showed higher proportions of leaves and stems, although the leaves-to-stem ratio remained similar across production systems. The defoliation interval was lower in intensive (14.4 days) and higher in extensive (18.7 days) treatments. Thus, pasture intensification accelerates leaf appearance, decreases leaf lifespan, shortens the tiller defoliation interval and increased herbage accumulation rate but does not change herbage mass. The extensive system produces excessive forage losses due to dead material. (AU) | |
| Processo FAPESP: | 17/18750-7 - Impacto da intensificação sustentável da produção de bovinos de corte em áreas tropicais na mitigação das mudanças climáticas |
| Beneficiário: | Márcia Helena Machado da Rocha Fernandes |
| Modalidade de apoio: | Auxílio à Pesquisa - Regular |