scholarly journals PRE-IRRIGATION WITH GEL HIDRORETENTOR IN EUCALYPTUS SEEDLING ESTABLISHMENT IN THE FIELD

FLORESTA ◽  
2019 ◽  
Vol 49 (3) ◽  
pp. 391
Author(s):  
Lynniker Trés Bernardino ◽  
Robson Bonomo ◽  
Joabe Martins de Souza ◽  
Moises Zucoloto
Keyword(s):  
Root System ◽  
Seedling Establishment ◽  
Water Retention ◽  
New Technologies ◽  
Eucalyptus Grandis ◽  
Stem Diameter ◽  
Critical Stage ◽  
Survival Index ◽  
Morphological Variables ◽  
Hybrid Eucalyptus

Research has sought new technologies aimed at establishing more productive forests. Hidroretentor gel that has the function of increasing the availability of water to the plant, in the most critical stage of establishment of the cuttings in the field. The objective of this study was to evaluate increasing levels of water retention gel applied in pre-irrigation, moments before planting, observing the survival index, and the morphological variables for the hybrid Eucalyptus grandis x E. urophylla-03, in Chapadinha-MA. The experiment was a randomized block with seven treatments and three replicates. The treatments consisted of five increasing doses of 1.0; 2.0; 3.0; 4.0 and 5.0 g 5 L-1 gel solution per liters of pre-irrigation, a treatment without the use of the gel; and a conventional planting treatment. The use of pre-irrigation with hidroretentores polymers, known as hidroretentor gel at a concentration of 4 and 5g 5L-1, provides a greater height, stem diameter, increasing the growth of eucalyptus plants in post-planting. The depth of the root system did not improve when a higher dose of gel was used, obtaining lower values than those obtained by the treatment without the use of the hidroretentor gel.

scholarly journals Eucalypt Clonal Hybrid Influences the Carbon Amount of Below-Ground Biomass in Oxisol, Brazil

2020 ◽  
Vol 3 (1) ◽  
pp. 53
Author(s):  
Grasiele Dick ◽  
Humberto J. Eufrade-Junior ◽  
Mauro V. Schumacher ◽  
Gileno B. Azevedo ◽  
Saulo P. S. Guerra
Keyword(s):  
Carbon Concentration ◽  
Eucalyptus Grandis ◽  
Eucalyptus Camaldulensis ◽  
Eucalyptus Urophylla ◽  
Ground Biomass ◽  
Homogeneity Of Variances ◽  
Below Ground ◽  
Hybrid Eucalyptus ◽  
Carbon Determination ◽  
Hybrid Clones

The objective of this study was to evaluate whether there is an influence of different clonal hybrids of Eucalyptus urophylla on the carbon concentration and amount in below-ground biomass in trees cultivated in Oxisol, Brazil. Stumps and roots of three different eucalypt hybrid clones, AEC 0144, AEC 0223, and VM01, were selected, weighed immediately after being removed from the ground, and sampled for carbon determination and moisture content at the laboratory. The Shapiro-Wilk and Bartlett tests were used to evaluate data distribution and the homogeneity of variances, respectively. Analysis of variance (ANOVA) complemented by the Scott-Knott test was used to evaluate the effects of specie/hybrid on the below-ground biomass (dry matter) and carbon amount per stump. The hybrid type of Eucalyptus urophylla does not influence the carbon concentration; however, there is a difference in below-ground biomass production and carbon amount with it being higher for Eucalyptus urophylla × Eucalyptus camaldulensis when compared to the species Eucalyptus urophylla and hybrid Eucalyptus urophylla × Eucalyptus grandis.

scholarly journals Behavior of Eucalyptus grandis and E. cloeziana seedlings grown in arsenic-contaminated soil

2010 ◽  
Vol 34 (3) ◽  
pp. 985-992 ◽  
Author(s):  
Roseli Freire Melo ◽  
Luiz Eduardo Dias ◽  
Jaime Wilson Vargas de Mello ◽  
Juraci Alves Oliveira
Keyword(s):  
Root System ◽  
Plant Height ◽  
Contaminated Soil ◽  
Dry Matter ◽  
Eucalyptus Grandis ◽  
Soil Samples ◽  
Mining Activities ◽  
Polluted Soils ◽  
Interveinal Chlorosis ◽  
Apical Bud

Arsenic has been considered the most poisonous inorganic soil pollutant to living creatures. For this reason, the interest in phytoremediation species has been increasing in the last years. Particularly for the State of Minas Gerais, where areas of former mining activities are prone to the occurrence of acid drainage, the demand is great for suitable species to be used in the revegetation and "cleaning" of As-polluted areas. This study was carried out to evaluate the potential of seedlings of Eucalyptus grandis (Hill) Maiden and E. cloeziana F. Muell, for phytoremediation of As-polluted soils. Soil samples were incubated for a period of 15 days with different As (Na2HAsO4) doses (0, 50, 100, 200, and 400 mg dm-3). After 30 days of exposure the basal leaves of E. cloeziana plants exhibited purple spots with interveinal chlorosis, followed by necrosis and death of the apical bud at the 400 mg dm-3 dose. Increasing As doses in the soil reduced root and shoot dry matter, plant height and diameter in both species, although the reduction was more pronounced in E. cloeziana plants. In both species, As concentrations were highest in the root system; the highest root concentration was found in E. cloeziana plants (305.7 mg kg-1) resulting from a dose of 400 mg dm-3. The highest As accumulation was observed in E. grandis plants, which was confirmed as a species with potential for As phytoextraction, tending to accumulate As in the root system and stem.

scholarly journals IBA AND MICROCUTTING COLLECTIONS IN THE MICROPROPAGATION OF Eucalyptus spp HYBRID CLONES.1

2017 ◽  
Vol 41 (6) ◽  
Author(s):  
Ricardo Gallo ◽  
Aloisio Xavier ◽  
Luciana Coelho de Moura ◽  
Brener de Almeida Oliveira ◽  
Heloisa Rocha do Nascimento ◽  
...  
Keyword(s):  
Eucalyptus Grandis ◽  
Stem Diameter ◽  
Residual Effects ◽  
Seedling Height ◽  
Seedling Vigor ◽  
Eucalyptus Urophylla ◽  
Ex Vitro ◽  
Semisolid Medium ◽  
Hybrid Clones

ABSTRACT This study aims to evaluate the effect of IBA concentrations and microcuttings successive collections in the micropropagation of Eucalyptus grandis x E. urophylla and Eucalyptus urophylla x E. globulus clones. Clumps containing six to eight buds of clones established in vitro were transferred to a 250 mL glass flask in JADS semisolid medium. Successive collections were performed every 20 days for Eucalyptus grandis x E. urophylla clone and every 30 days for Eucalyptus urophylla x E. globulus clone. The following variables were evaluated under in vitro conditions: number of shoots > 0.5 cm, number of microcuttings > 2 cm, length of the longest microcutting, and shoots vigor. Under ex vitro conditions, in the greenhouse and shade house, the following variables were evaluated: seedling height, percentage of survival, stem diameter, percentage of root observed at the lower end of the tube, and seedling vigor. In full sun (ex vitro), the following variables were analyzed: seedling height, stem diameter, survival, number of roots, root volume, seedling vigor, and shoot and root dry matter. Good in vitro microcuttings productivity was observed over the successive collections. IBA levels were adjusted for each clone, ranging from 0.25 to 0.50 mg L-1 for Eucalyptus grandis x E. urophylla clone, and from 0.75 to 1.0 mg L-1 for Eucalyptus urophylla x E. globulus clone. IBA concentrations led to residual effects under ex vitro conditions, providing good rooting and survival for Eucalyptus grandis x E. urophylla and Eucalyptus urophylla x E. globulus clones at IBA concentrations between 0.25 and 0.50 mg L-1 and between 0.50 and 1.0 mg L-1, respectively.

scholarly journals Soybean waste in particleboard production

2018 ◽  
Vol 42 (2) ◽  
pp. 186-194 ◽  
Author(s):  
Evelyn Hoffmamm Martins ◽  
Alan Pereira Vilela ◽  
Rafael Farinassi Mendes ◽  
Lourival Marin Mendes ◽  
Lívia Elisabeth Vasconcellos de Siqueira Brandão Vaz ◽  
...  
Keyword(s):  
Water Absorption ◽  
Water Immersion ◽  
Eucalyptus Grandis ◽  
Raw Material ◽  
Modulus Of Rupture ◽  
High Yield ◽  
Thickness Swelling ◽  
Randomized Design ◽  
Completely Randomized Design ◽  
Hybrid Eucalyptus

ABSTRACT Brazil is the second largest soybean producer in the world, with a yield of around 96.2 million tons per crop. This high yield leads to a great amount of waste resulting from soybean cultivation, which can reach approximately 41 million tons of waste per year. This material has lignocellulosic properties, which may enable its use as a raw material for particleboard production. Therefore, the objective of this study was to evaluate the use of soybean pods in particleboard production. For particleboard manufacture, wood of the hybrid Eucalyptus urophylla and Eucalyptus grandis was used, added with soybean pods, at proportions of 0%, 25%, 50%, 75% and 100%. For particleboard evaluation, a completely randomized design was used, with five treatments and three replicates, using linear regression and the Scott-Knott test at 5% significance for comparison among the different treatments. The properties apparent density, compaction ratio, water absorption after 2 and 24 hours, thickness swelling after 2 and 24 hours in water immersion, internal bonding, modulus of rupture and modulus of elasticity in bending properties were evaluated. The ratio soybean pod waste and eucalyptus particles in the panels led to an increase in water absorption values and thickness swelling, in addition to a decrease in mechanical properties. The production of panels with approximately 23% soybean pods is feasible.

scholarly journals BIOMASSA E NUTRIENTES DE EUCALIPTO CULTIVADO EM SISTEMA AGROSSILVIPASTORIL

Nativa ◽  
2018 ◽  
Vol 6 ◽  
pp. 754
Author(s):  
Charlote Wink ◽  
Anderson Lange ◽  
Kamile Zompero Araújo ◽  
Ana Paula Silveira ◽  
Maurel Behling ◽  
...  
Keyword(s):  
Eucalyptus Grandis ◽  
Triple Line ◽  
Nutrient Content ◽  
Integration System ◽  
Line Arrangement ◽  
Residual Biomass ◽  
Technological Unit ◽  
Simple Arrangement ◽  
Nutrient Stock ◽  
Hybrid Eucalyptus

O objetivo foi quantificar a biomassa e o estoque de nutrientes do híbrido Eucalyptus grandis Hill ex Maiden x E. urophylla S. T. Blake (clone H13) aos 60 meses em sistema agrossilvipastoril. O estudo da biomassa residual (folhas e galhos finos), galhos grossos, madeira e casca e do estoque de nutrientes de eucalipto foi realizado na unidade de referência tecnológica de integração lavoura-pecuária-floresta em Nova Canaã do Norte, MT, cultivado em arranjo simples (2x20 m), duplo (3x2x20 m), triplo (3x2x20 m) e em monocultivo (4x3 m). Apenas a biomassa de galhos grossos, madeira e casca apresentaram diferenças significativas entre arranjos. Os nutrientes se acumularam em maior quantidade na madeira, e em ordem decrescente na casca, biomassa residual e nos galhos grossos. A biomassa residual, galhos grossos e casca correspondem a fração expressiva de nutrientes que permanece no sistema, e que contribuem para menor reposição na manutenção desses, após a colheita. O arranjo triplo apresentou maior acúmulo nutricional comparado ao arranjo simples e duplo. A eficiência nutricional é maior no arranjo de linha tripla devido a maior competição intraespecífica. O teor de nutrientes nas diferentes posições ao longo do fuste não apresentou variações nutricionais significativas para a madeira, diferentemente para a casca.Palavras-chave: sistema iLPF, nutrição florestal, compartimentos. BIOMASS AND NUTRIENTS OF EUCALYPTUS CULTIVATED IN AGROSSILVIPASTORAL SYSTEM ABSTRACT:The objective was to quantify the biomass and nutrient stock of the hybrid Eucalyptus grandis Hill ex Maiden x E. urophylla S. T. Blake, (clone H13) at 60 months in the agrosilvipastoril system. The study of the residual biomass (leaves and thin branches), thick branches, wood and bark and of the nutrient stock of eucalyptus was carried out in the technological unit of crop-livestock-forest integration in Nova Canaã do Norte, MT, cultivated in a simple arrangement (2x20 m), double (3x2x20 m), triple (3x2x20 m) and monoculture (4x3 m). Only the biomass of thick branches, wood and bark presented significant differences between arrangements. The nutrients accumulate in greater quantity in the wood, and in descending order in the bark, residual biomass and in the thick branches. Residual biomass, thick branches and bark correspond to the expressive fraction of nutrients that remain in the system, and which contribute to a lower replacement in the maintenance of these, after harvesting. The triple arrangement presented greater nutritional accumulation compared to the single and double arrangement. The nutritional efficiency is higher in the triple line arrangement due to greater intraspecific competition. The nutrient content in the different positions along the stem did not present significant nutritional variations for the wood, differently for the bark.Keywords: CLF integration system, forest nutrition, compartments.

scholarly journals Dynamics of initial spacing on the diameter of hybrid Eucalyptus grandis x Eucalyptus urophylla in a systematic design

2021 ◽  
pp. 422-430
Author(s):  
Mirella Basileu de Oliveira Lima ◽  
Mauro Eloi Nappo ◽  
Kálita Luis Soares ◽  
Renato Vinícius Oliveira Castro ◽  
Eder Pereira Miguel ◽  
...  
Keyword(s):  
Eucalyptus Grandis ◽  
Planting Density ◽  
Diameter Distribution ◽  
Eucalyptus Urophylla ◽  
Central Brazil ◽  
Kolmogorov Smirnov ◽  
Diameter Structure ◽  
Initial Spacing ◽  
Hybrid Eucalyptus

We evaluated the effect of initial spacing on the distribution of Eucalyptus grandis x Eucalyptus urophylla tree diameters in a Nelder wheel design. The study area was in west-central Brazil. A Nelder wheel design with three repetitions was used. This design provides 432 planting spots per plot/repetition. Planting density varied from 0.50 m² to 41.25 m². The diameter at breast height was measured for all plants every four months until 36 months of age, totaling eight measurements. The description of the diameter distribution was developed by fitting probability density functions for each spacing and age. The quality of fit was evaluated using the root mean square error percentage, Pearson’s correlation coefficient, and the Kolmogorov-Smirnov test (α < 0.05). The spacings up to 1.17 m² must be harvested in less than two years, since it is noted that in the third year the increment in diameter is static and the mortality rate increases. The spacing highly affects the diameter structure of the population, impelling the forester to consider different uses for the wood. For wood requiring larger diameters, spacing above 8.69 m² per tree is recommended

Within-Tree Variation in Wood Fibre Biometry And Basic Density of the Urograndis Eucalypt Hybrid (Eucalyptus Grandis × E. Urophylla)

IAWA Journal ◽  
2006 ◽  
Vol 27 (3) ◽  
pp. 243-254 ◽  
Author(s):  
Teresa Quilhó ◽  
Isabel Miranda ◽  
Helena Pereira
Keyword(s):  
Wall Thickness ◽  
Fibre Length ◽  
Eucalyptus Grandis ◽  
Basic Density ◽  
Wood Properties ◽  
Axial Variation ◽  
Average Fibre ◽  
Length Width ◽  
Hybrid Eucalyptus ◽  
Old Trees

Within-tree variations in fibre length, width, wall thickness and wood basic density of Eucalyptus grandis × E. urophylla (urograndis) were studied in five 6.8-yr-old seedling trees and five 5.6-yr-old trees from one clone from Brazil. Samples were taken at 5%, 25%, 35%, 55%, 65% and 90% of stem height and five radial positions (10%, 30%, 50%, 70% and 90% of radius). The tree average fibre length, width and wall thickness were in seed and clone trees: 0.955 mm and 1.064 mm, 18 μm and 20 μm, 3.6 μm and 4.4 μm respectively. The axial variation of fibre dimensions was very low, while there was a consistent but small increasing trend from pith to periphery. The basic density ranged from 397–464 kg/m3 to 486–495 kg/m3 respectively in seedling and clone trees with a low variation along the stem. In comparison with other eucalypt pulpwood, e.g. E. globulus, the urograndis hybrid showed similar fibre dimensions and lower basic density. Overall the within-tree variation of these wood properties was low and age had a small impact on the variation of density and fibre dimensions.

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