Data/hora: 08/06/2024 05:21:19

Biblioteca(s): | Embrapa Caprinos e Ovinos.
Data corrente: | 21/12/2006
Data da última atualização: | 13/12/2023
Autoria: | DUNN, G. M.; LOWE, K. F.; TAYLOR, D. W.; BOWDLER, T. M.
Título: | Early tree pasture growth in an agroforestry system evaluating Albizia lebbeck, Casuarina cunninghamiana and Eucalyptus maculata in south-east Queensland.
Ano de publicação: | 1994
Fonte/Imprenta: | Tropical Grassland, v. 28, n. 3, p. 170-181, 1994.
Idioma: | Inglês
Conteúdo: | Abstract : An experiment evaluating Albizia lebbeck, Casuarina cunninghamiana and Eucalyptus maculata at 5 densities in a pasture containing Chloris gayana cv. Callide (rhodes grass), Chamaecrista rotundifolia cv. Wynn (Wynn cassia), Stylosanthes scabra cv. Seca (stylo), Lotononis bainesii cv. Miles (lotononis) and Trifolium repens cv. Haifa (white clover) was established in SE Queensland in 1990. The 5 planting densities (78, 182, 343, 771 and 1189 stems/ha) were replicated on lower, mid- and upper slope positions. Over the first 3 years, C. cunninghamiana (mean height 5.5 m) grew significantly faster than E. maculata (4.3 m), which, in turn, grew significantly faster than A. lebbeck (2.6 m). Due to its poor growth and a mortality rate of 12.3%, A. lebbeck was considered poorly suited to the site. The heights of the 3 species were not significantly affected by planting density or position on the slope. Stem diameter at 1.3 m (diameter at breast height, DBH), measured for 3-year-old C. cunninghamiana only, peaked at 343 stems/ha. The DBHs of mid- and lower slope trees were similar and significantly greater (by 17.4%) than those of upper slope trees. During the 3rd year after establishment, median pasture yield (measured midway between trees at all spacings) was significantly increased under the highest 2 density treatments of A. lebbeck (by 17.7% and 39.6%) and E. maculata (by 25.5% and 17.2%) when compared with other density treatments. The proportion of pasture in each plot killed by the application of herbicide (glyphosate) around the base of establishing trees increased with increasing density, from 1.4% (78 stems/ha) to 21% (1189 stems/ha). Thus, although median pasture yield was significantly higher under the highest densities, yields adjusted for these sprayed areas were similar and unaffected by tree density, averaging 7.4 t/ha. At this early stage, pasture yields were also unaffected by tree species or slope position.
Palavras-Chave: | Agroforestry systems; Albizzia lebbeck; Coração de negro; Eucalyptus maculata; Increment; Plant height; Sistema agrossilvipastoril; Sylvopastoral systems.
Thesagro: | Albizia lebbeck; Chloris Gayana; Crescimento; Desmama Precoce; Pastagem Nativa; Stylosanthes Scabra; Trifolium Repens.
Thesaurus Nal: | Casuarina cunninghamiana; Chamaecrista rotundifolia; Corymbia maculata; Diameter; Farms and Farming Systems; Forest growth; Forest trees; Glyphosate; Herbicides; Lotononis bainesii; Mortality; Multipurpose trees; Stand density.
Categoria do assunto: | P Recursos Naturais, Ciências Ambientais e da Terra
Registro original: | Embrapa Caprinos e Ovinos (CNPC)
Exemplares: | CNPC - (19362-1) - ADD - AP - PP - SP 04203 -  - SP 04203 - DIS