Growth of Bare Root Pinus taeda L. Seedlings Cultivated Under Five Densities in Nursery


ABSTRACT: Seedlings compete for nutrients, water and light. The available area for each seedling affectstheir behavior related to requirements for these resources. This experiment evaluated the influence of fiveplant densities on the growth of bare root Pinus taeda, L. seedlings in a nursery after outplanting. Theanalyzed characteristics were: height (H), root collar diameter (D), H/D ratio, and dry matter weight.Higher densities stimulated H growth and the lowest densities increased D average and dry matter weightand lowered the H/D ratio. Seedlings were distributed by H, D and H/D classes. Higher densities had alarger number of seedlings in larger H classes. Larger numbers of seedlings with larger D and lower H/Dratios were found in lower densities. Ten months after outplanting the seedlings grown in lower densitieshad higher survival percentages and growth. Some saplings of standardized heights were uprooted withthe objective of studying their root systems. The lowest densities stimulated higher numbers of first andsecond order roots as well as fresh and dry matter weights of thin roots with mycorrhizae presence. In bothparts of the experiment, the density of 278 seedlings m-2 yielded equivalent averages as compared to thelowest densities.
PDF details
Publication Scientia Agricola (Piracicaba, Braz.)
Event 2007
Author J.G. De Araujo Carneiro, D.G., and L.M. da Silva Soares
Volume 64
Number 001
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