Data/hora: 08/06/2024 00:13:48

Biblioteca(s): | Embrapa Agrobiologia.
Data corrente: | 01/06/2020
Data da última atualização: | 01/06/2020
Autoria: | GOMES, F. de K.; HOMEM. B. G. C.; OLIVEIRA, M. D. B. L de; DUBEUX, J. C. B.; BODDEY, R. M.; BERNARDES, T. F.; CASAGRANDE, D. R.
Afiliação: | FERNANDA DE KÁSSIA GOMES B, UFLA; BRUNO GROSSI COSTA HOMEM, UFLA; UFLA; University of Florida, USA; ROBERT MICHAEL BODDEY, CNPAB; UFLA; UFLA.
Título: | Defoliation frequency affects litter responses and nitrogen excretion by heifers in palisadegrass?forage peanut pastures.
Ano de publicação: | 2020
Fonte/Imprenta: | Agronomy Journal, v., p. 1-12, 2020
ISSN: | 1435-0645
DOI: | DOI: 10.1002/agj2.20240
Idioma: | Inglês
Conteúdo: | Legumes can contribute significantly to nitrogen (N) input in grazing systems. Grazing management is a critical factor affecting N cycling in mixed pastures, altering the legume N input as a result. This study assessed how defoliation frequency affects N cycling inrotationally stocked palisadegrass (Brachiariabrizantha)and forage peanut (Arachis pintoi) pastures. Treatments included four grazing management strategies, defined by the rest period interruption when the canopy reached 90 (90LI), 95 (95LI), and 100% (100LI) of photosynthetically active radiation interception (LI), and a fixed rest period of 42 d (42D). A 2-yr experimental period was adopted. Existing litter was greater at 100LI (2208 vs. 1964 kg ha&#8722;1; average of 42D, 90LI, and 95LI, respectively). Greater defoliation frequency (42D and 90LI) resulted in increase of litter legume proportion, resulting in greater decomposition rate, lower litter halflife (p < .001, and p = .015, respectively), and greater N cycling (91 vs. 64 kg ha&#8722;1 season&#8722;1). Less frequent defoliation (100LI) resulted in reduced total forage intake, proportion of legume intake, and lower N intake compared with other treatments (p= .007, p= .081, and p < .001, respectively). Greater defoliation frequency increased N cycling via litter, but did not affect excretion due to compensation with stocking rate. Defoliation frequency between 90 and 95% LI optimizes N cycling in palisadegrass-forage peanut mixed pastures.
Thesagro: | Brachiaria sp.
Thesaurus Nal: | Arachis pintoi.
Categoria do assunto: | P Recursos Naturais, Ciências Ambientais e da Terra
Registro original: | Embrapa Agrobiologia (CNPAB)