THE EFFECT OF PRUNING INTENSITY ON THE PRODUCTION OF Pinus elliottii Engelm., IN A POOR SOIL IN THE STATE OF RIO GRANDE DO SUL
DOI:
https://doi.org/10.5902/19805098364Keywords:
Pinus elliottii Engelm., pruning, yield.Abstract
The effect of the pruning intensity on the production of Pinus elliottii Engelm. was studied in a randomized block design trial with 5 treatments and 3 repetitions. The treatments were: T1 – control, without pruning; T2 – pruning of the dead branches; T3 – pruning of 40% of the total height; T4 - pruning of 50% of the total height; and T5 – pruning of 60% of the total height. The diameter and wood volume were affected by the pruning intensity of the 11-year old stand. The control (263.5 m3/ha) and pruning of the dead branches (245.1 m3/ha) were different from all other treatments (pruning of 40% - 231.5 m3/ha; pruning of 50% - 225.5 m3/ha; and pruning of 60% -211.6 m3/ha). The smallest production loss was 12% on the 40% pruning, and the greatest loss was 20% on the 60% pruning treatment. It is concluded that pruning intensities below 40% of the total height should be employed because of the lower production losses, and increases in diameter and quality of the wood.
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References
AARON, J. R. Pros and cons of pruning in conifers. Journal of Forestry , v.63, n.4, p.295-304, 1969.
ASSMANN, E. The principles of forest yield study. New York: Pergamon Press. 1970. 384p.
BERENHAUSER, H. Importância da poda em Pinus spp. para produção de madeira de melhor qualidade. Rev. Floresta, v.3, n.3, p.33-35, 1970.
DANIEL, T. W. Principles of Silviculture. 2a. ed. New York: McGraw - Hill, 1979. 410p.
DANIEL, Th, W.; HELMS, J. A. & BAKER, F. S. Principles de Silvicultura. 2a. ed. México: McGraw - Hill, 1982. 492p.
FISHWICK, R. W. Dados iniciais sobre poda em Pinus elliottii. Brasília: Prodepef, 1977. 7p. (Comunicação Técnica, 5)
HAWLEY, R. C. & SMUTH, D. M. Silvicutura prática. Barcelana: Ed. Omega S.A., 1972. 544p.
KNIGGE, W. & OLISCHLAGER, K. Möglichkeiten der Grünastung der Fichte. Holz-Zbl. v.96, p.1497-1500. 1970.
KOZLOWSKI, T. T.; KRAMER, R.J. & PALLARDY, S.G. The Physiological Ecology of Woody Plants. San Diego, California: Academic Press, 1990. 657p.
KRAMER, J. P. & KOSWLOSKI, T. Fisiologia das árvores. Lisboa: Fundação Caloustre Gulbekian, 1972. 745p.
LAAR, A. Von. High pruning of Pinus radiata. South African Forestry Lourval. v.52, p.27-33, 1965.
LEMOS, R.C.; AZOLIN, M.A.D.; ABRAÃO, P.V.R. & SANTOS, M.C.L. Levantamento e reconhecimento dos solos do Estado do Rio Grande do Sul. Recife: Ministério da Agricultura, Departamento Nacional de Pesquisas Agropecuárias - Divisão de Pesquisas Pedológicas, 1973. 431p. ( Boletim Técnico, 30).
MORENO, J.A. Clima do Rio Grande de Sul. Porto Alegre: Secretaria da Agricultura-Diretoria de Terras e Colonização, 1961. 42p.
RAMOS, I. África do Sul: horizonte florestal do Brasil. São Paulo: Editora Joruês, 1973. 81p.
SCHNEIDER, P. R. Introdução ao manejo florestal. Santa Maria: CEPEF/FATEC/ UFSM, 1993. 348P.
SCHULTZ, H. Unsere Enkel und IKW Wertholz. Holz-zbl. v.103, p. 741-743, 1977.
