Nutrient accumulation in Eucalyptus bark at different population densities/Acumulo de nutrientes na casca de Eucalyptus em diferentes densidades populacionais

The objective of this study was to quantify the accumulation of nutrients in the bark of four eucalyptus clones at 12 years-of-age, planted at different population densities, and the values were extrapolated to kg of nutrients per hectare. The experiment used randomized blocks in a 4 x 3 factorial d...

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Published in:Revista brasileira de engenharia agrícola e ambiental 2019-01, Vol.23 (1), p.40
Main Authors: Ma, Rocha, Maria F.V, Nieri, Erick M, de Melo, Lucas A, de S. Silva, Maria L, da Silva, Diana S.N
Format: Article
Language:English
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Summary:The objective of this study was to quantify the accumulation of nutrients in the bark of four eucalyptus clones at 12 years-of-age, planted at different population densities, and the values were extrapolated to kg of nutrients per hectare. The experiment used randomized blocks in a 4 x 3 factorial design and three replications, with four Eucalyptus clones (2486, I182, I144, and GG100) planted at three population densities (416, 833, and 1111 trees [ha.sup.-1]). The rigorous cubage of three trees per plot was performed by collecting discs of bark at the following heights: diameter at breast height (1.30 m), 0, 25, 50, 75, and 100% of the commercial height of the stem. The bark discs of each tree were grouped and used to determine N, P, K, Ca, Mg, and S content, in addition to the basic density. The volume and dry mass of bark per tree was estimated and the accumulation of nutrients per tree [ha.sup.-1] was estimated sequentially, for each population density. Analysis of variance and Tukey's post-hoc tests verified that Ca showed the greatest accumulation in the bark, followed by N, K, S, Mg, and P. The increase in population density contributed to higher bark production and greater nutrient accumulation per hectare. However, this increase was not evident when comparing densities of 833 and 1111 trees [ha.sup.-1]. Key words: compartmentalization, nutrient cycling, spacing Objetivou-se neste trabalho quantificar o acumulo de nutrientes na casca de quatro clones de eucalipto, aos 12 anos, plantados em diferentes densidades populacionais, extrapolando os valores para kg de nutrientes por hectare. O delineamento experimental foi em blocos casualizados, em arranjo fatorial 4 x 3 com tres repeticoes, sendo quatro clones de eucalipto (2486, I182, I144 e GG100), plantados em tres densidades populacionais (416, 833 e 1111 plantas por hectare). A cubagem rigorosa de tres arvores por parcela foi realizada por meio da coleta de discos de casca nas seguintes alturas: diametro a altura do peito (1,30 m), 0, 25, 50, 75 e 100% da altura comercial do fuste. Os discos de casca de cada arvore foram agrupados e utilizados para determinar os teores de N, P, K, Ca, Mg e S, alem da densidade basica. O volume e a massa seca de casca por arvore foram estimados e o acumulo de nutrientes por arvore e hectare foi estimado sequencialmente, para cada densidade populacional. Os valores encontrados foram submetidos a analise de variancia e ao teste de Tukey, verificando que o Ca foi o nutr
ISSN:1415-4366
1807-1929
DOI:10.1590/1807-1929/agriambi.v23n1p40-46