Author(s):
Ongaratto, Fernando [UNESP] ; Fernandes, Marcia Helena Machado da Rocha [UNESP] ; Dallantonia, Erick Escobar [UNESP] ; Lima, Lais de Oliveira [UNESP] ; Do Val, Guilherme Alves [UNESP] ; Cardoso, Abmael da Silva [UNESP] ; Rigobello, Izabela Larosa [UNESP] ; Campos, Jorge Augusto Americo [UNESP] ; Reis, Ricardo Andrade [UNESP] ; Ruggieri, Ana Claudia [UNESP] ; Malheiros, Euclides Braga [UNESP]
Date: 2022
Persistent ID: http://hdl.handle.net/11449/229668
Origin: Oasisbr
Subject(s): Ammonium nitrate; Beef cattle; Canopy; Intensification; Morphogenesis; Urochloa
Description
Made available in DSpace on 2022-04-29T08:35:02Z (GMT). No. of bitstreams: 0 Previous issue date: 2021-09-01
Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)
Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)
Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq)
Pasture intensification through higher stocking rates, nitrogen fertilization and intensified grazing management in beef cattle production optimizes pasture use by increasing the forage har-vested. 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.
Department of Animal Science Sao Paulo State University (UNESP), Campus Jaboticabal, Via de Acesso Prof. Paulo Donato Castellane
Department of Engineering and Exact Sciences Sao Paulo State University (UNESP), Campus Jaboticabal, Via de Acesso Prof. Paulo Donato Castellane
Department of Animal Science Sao Paulo State University (UNESP), Campus Jaboticabal, Via de Acesso Prof. Paulo Donato Castellane
Department of Engineering and Exact Sciences Sao Paulo State University (UNESP), Campus Jaboticabal, Via de Acesso Prof. Paulo Donato Castellane
FAPESP: 2017/18750-7
CNPq: 431713/2018-9
