Data/hora: 16/06/2024 08:40:23

Biblioteca(s): | Epagri-Sede.
Data corrente: | 13/12/2016
Data da última atualização: | 13/12/2016
Autoria: | PONTE, L. S.; BALDISSERA, T. C.; GIOSTRI, A. F.; STAFIN, G.; SANTOS, B. R. C.; CARVALHO, P. C. F.
Título: | Effects of nitrogen fertilization and cutting intensity on the agronomic performance of warm-season grasses.
Ano de publicação: | 2016
Fonte/Imprenta: | Grass and Forage Science, Chichester, United Kingdom, p. 1-13, 2016.
Idioma: | Inglês
Conteúdo: | Responses of grasses to N fertilization are affected by cutting intensity although little is known regarding the interactions of these factors in warm-season grasses. Pre cutting canopy height, herbage accumulation and changes in the nutritive value of warm-season grasses in response to four different management strategies were assessed from October 2011 to September 2014. Treatments included two cutting intensities (70 vs. 50% depletion of canopy height set by 95% light interception), two N fertilization levels (zero vs. 300 kg N ha1 year1) and six perennial C4 grass species (Axonopus catharinensis; Cynodon spp. hybrid Tifton 85; Hemarthria altissima cv. Florida; Megathyrsus maximus cv. Aruana; Paspalum notatum cv. Pensacola; and Urochloa brizantha cv. Marandu) grown in monoculture in a factorial experimental design. Canopy height varied among grass species, cutting intensity and N treatments, mainly among seasons, indicating that more than one management target (i.e. canopy height) existed throughout the plant growth cycle for each species. The largest herbage accumulation occurred in the N fertilization treatments for most species, regardless of cutting intensity. Nitrogen fertilization and 50% depletion of canopy height increased the leaf proportion and decreased the neutral detergent fibre content. Overall, N fertilization had a stronger positive impact than cutting intensity on the acid detergent fibre content, dry-matter digestibility and crude protein content, but the magnitudes of the responses were species-specific.
Palavras-Chave: | cutting intensity; dry-matter yield; light interception; N supply; nutritive value; tropical grasses.
Categoria do assunto: | X Pesquisa, Tecnologia e Engenharia
URL: | http://intranetdoc.epagri.sc.gov.br/producao_tecnico_cientifica/DOC_38724.pdf
Registro original: | Epagri-Sede (Epagri-Sede)
Exemplares: | Epagri-Sede - (100871-1) - UPC - AP - DD -  -  -  - DIS