INFLUENCE OF THE REPLANTING AGE ON YIELD AND GROWTH OF EUCALYPT CLONAL STANDS

Geraldo Magela Pereira Filho,Samuel José Silva Soares Da Rocha,Laércio Antônio Gonçalves Jacovine,Haroldo Nogueira De Paiva,Bruno Leão Said Schettini,Hélio Garcia Leite,Paulo Henrique Villanova

doi:10.1590/1806-908820200000002

Geraldo Magela Pereira Filho, Samuel José Silva Soares Da Rocha + Show 5 more

Open Access

https://doi.org/10.1590/1806-908820200000002

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Journal: Revista Árvore	Publication Date: Jan 1, 2020
Citations: 2	License type: CC BY 4.0

Affiliation: Universidade Federal de Viçosa

Abstract

ABSTRACT The growth of an eucalypt plantation should be monitored to identify factors that influence its development, helping in the decision-making process, aiming to reduce productivity losses. Thus, the objective of the present study was to evaluate the influence of the age of replanting on the yield and growth of eucalypt stands. The experiment was conducted in an area of CENIBRA S.A. Company, and established in a commercial plantation in August 2011. The application of herbicide and the ant control were performed in total area before planting. Seedlings of Eucalyptus urophylla × Eucalyptus grandis clones in 3.0 × 2.5 m spacing were used. Limestone (1,500 kg ha-1) was applied in total area before planting and 100 g plant-1 of NPK fertilizer (06-30-06) was applied immediately after planting. Four months after the installation of the experiment, 300 kg ha-1 of NPK (06-10-29) was applied. Treatments consisted of four dates of seedling replanting (0, 20, 40 and 80 days after planting) without complementary fertilization, and two treatments (replanting 40 and 80 days after planting) with supplementary fertilization (100g plant-1 NPK 06-30-06). The individual volume of replanting trees was 46.6% lower than of non-replanted ones. Treatments with complementary planting fertilization did not differ (p > 0.05) by the T-test. It is concluded that the longer the time between planting and replanting, the smaller the individual volume of the replanting trees and that the complementary fertilization in seedlings replanted does not favor their growth.

Highlights

Brazilian eucalyptus stands are among the most productive in the world (Soares et al, 2016; Binkley et al, 2017)
Seedlings of Eucalyptus urophylla × Eucalyptus grandis clones in 3.0 × 2.5 m spacing were used
Treatments consisted of four dates of seedling replanting (0, 20, 40 and 80 days after planting) without complementary fertilization, and two treatments with supplementary fertilization (100g plant-1 NPK 06-30-06)

Summary

Introduction

Brazilian eucalyptus stands are among the most productive in the world (Soares et al, 2016; Binkley et al, 2017). The average productivity at seven years old, in the 1970s was close to 15 m3.ha-1.year-1 (Queiroz and Barrichelo, 2007), and close to 35.7 m3ha-1year-1 in 2016 (IBÁ, 2017). To this end, it was necessary to ensure the adequacy of the technical recommendations and quality of forestry operations (Trinidad et al, 2017), which bring improvements in the distribution of inputs and ensures the development of a more uniform and productive forest. There is a positive relationship between uniformity and productivity of eucalyptus stands (Stape et al, 2010; Luu et al, 2013; Soares et al, 2016), which are affected by the quality of silvicultural operations (Radtke et al, 2003). Late replanting causes greater competition for resources between plants, as older trees grow faster than younger trees because they use resources more efficiently (Binkley, 2004)

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