ESTOQUES DE BIOMASSA E NUTRIENTES EM TRÊS ESPÉCIES DE Parkia EM PLANTIOS JOVENS SOBRE ÁREA DEGRADADA NA AMAZÔNIA CENTRAL

As estratégias de distribuição de biomassa e nutrientes utilizadas pelas espécies florestais podem refletir sua capacidade de sobrevivência em plantios sobre áreas degradadas. O objetivo deste estudo foi quantificar os estoques de biomassa e nutrientes nos compartimentos arbóreos de Parkia multijuga, Parkia nitida e Parkia pendula em plantios sobre área degradada em Manaus, AM. A biomassa foi determinada pelo método destrutivo em seis árvores de cada espécie, que foram compartimentadas em: folhas, galhos finos (Ø <10 cm), galhos grossos (Ø ≥10 cm), fuste, raízes médias (2 mm ≤ Ø <5 cm) e raízes grossas (Ø ≥5 cm). Aos quatro anos, Parkia multijuga exibiu 60% do total de biomassa nos compartimentos aéreos e 40% nos subterrâneos. Parkia nitida exibiu 84% nos compartimentos aéreos e apenas 16% nos subterrâneos. Parkia pendula exibiu 67% nos compartimentos aéreos e 33% nos subterrâneos. A ordem de acúmulo de macronutrientes nos compartimentos foi: N > Ca > K > Mg > P. O fato de Parkia multijuga adotar estratégias de alocação de biomassa e nutrientes que favorecerão seu desempenho sobre sítios com baixa disponibilidade de recursos sustenta sua indicação para a composição de programas de reflorestamento em áreas degradadas na Amazônia.Palavras-chave: Espécies florestais nativas; nutrição florestal; reflorestamento; restauração. AbstractBiomass and nutrients in three species of Parkia plantings on degraded area in Central Amazon. Biomass and nutrients partitioning strategies in tree species may reflect their ability to survive in plantations on degraded areas. The objective of this study was to investigate the content of biomass and nutrients in tree components of Parkia multijuga, Parkia nitida and Parkia pendula on plantings in degraded area in Manaus, AM. The biomass was determined by the harvest method in six trees of each species, which were subdivided into leaves, fine branches (Ø < 10 cm), coarse branches (Ø ≥10 cm), stem wood, medium roots (≤ 2 mm Ø < 5 cm ) and coarse roots (Ø ≥ 5 cm). At 4 years, Parkia multijuga allocated 60% of the total biomass to above-ground components and 40% to below-ground. Parkia nitida allocated 84% to above-ground and 16% to below-ground. Parkia pendula allocated 67% to above-ground components and 33% to below-ground. The order of the nutrient accumulation in tree compartments was: N > Ca > K > Mg > P. Parkia multijuga, by adopting better strategies of distribution of biomass and nutrients, it is a recommended species for reforestation programs on degraded sites in the Amazon.Keywords: Native forest species; forest nutrition; reforestation; restoration.

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Biomass Production and Nutrient Accumulation by Natural Rubber (Hevea brasiliensis Wild. Ex A. Juss.) Müell. Arg. Clones in a Humid Tropical Area in South India

Grassroots Journal of Natural Resources ◽

10.33002/nr2581.6853.040309 ◽

2021 ◽

Vol 4 (3) ◽

pp. 94-110

Author(s):

Kannattuvadakkethil Krishnankutty Ambily ◽

Arumugham Ulaganathan

Keyword(s):

Natural Rubber ◽

Hevea Brasiliensis ◽

Allometric Equation ◽

Raw Material ◽

Total Biomass ◽

Nutrient Accumulation ◽

Ground Biomass ◽

Drought Tolerant ◽

Standing Trees ◽

Below Ground

Natural rubber (Hevea brasiliensis Wild. Ex A. Juss.) Müell. Arg. is an important commodity crop grown in world over for industrial raw material rubber latex for various products, mainly tyre manufacturing. Hevea propagation is through clones evolved by breeding as cultivars with desired characters. This article presented the biomass and nutrient accumulation of four important Hevea clones viz. RRII 105, RRII 118, RRII 203 and GT1 at 30 years age. Biomass and nutrient concentration of tree components viz. trunk, branches, leaf and root were assessed by uprooting the trees in the field and standing trees using allometric equation. Among the different clones, RRII 118 and GT1 recorded higher biomass compared to RRII 105 and RRII 203. Above-ground biomass (88-93 per cent) varied more than below-ground biomass (7-11 per cent). The high yielding clones had higher leaf and root biomass. Drought tolerant and timber clones viz. RRII 118 and RRII 203 recorded higher K and high yielding clone RRII 105 had higher Ca accumulation. Biomass removal of these clones may lead to deficiency of K and Ca in soil and hence needs the external supplements. The relation of high Ca content and leaf disease of fungal origin is promising for further studies. The higher accumulation of iron and manganese indicated the tolerance of Hevea to these elements and possibility of phytoremediation. The per cent contribution of nutrients to total biomass varied less between clones and was below 3 percent at the age of 30 years and this is evidence of adjustments in proportions of nutrients in Hevea irrespective of clonal variations.

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Biomass and nutrient cycling in pure and mixed stands of native tree species in southeastern Bahia, Brazil

Revista Brasileira de Ciência do Solo ◽

10.1590/s0100-06832007000200011 ◽

2007 ◽

Vol 31 (2) ◽

pp. 287-298 ◽

Cited By ~ 10

Author(s):

Antonio Carlos da Gama-Rodrigues ◽

Nairam Félix de Barros ◽

Nicholas Brian Comerford

Keyword(s):

Forest Ecosystems ◽

Natural Forest ◽

Native Forest ◽

Nutrient Accumulation ◽

Above Ground Biomass ◽

Forest Species ◽

Mixed Species ◽

Mixed Stands ◽

Ground Biomass ◽

Second Growth

The objective of this paper is to study selected components of the nutrient cycle of pure and mixed stands of native forest species of Atlantic Forest in southeastern Brazil. Tree diameter, height, above-ground biomass, and nutrient content were determined in 22-year-old stands. Litterfall, litter decomposition, and nutrient concentration were evaluated from August 1994 to July 1995. The following species were studied: Peltogyne angustiflora, Centrolobium robustum, Arapatiella psilophylla, Sclerolobium chrysophyllum, Cordia trichotoma, Macrolobium latifolium. The litter of a natural forest and a 40-year-old naturally regenerated second-growth forest was sampled as well. The mixed-species outmatched pure stands in height, stem volume and total biomass (29.4 % more). The greatest amount of forest litter was observed in the natural forest (9.3 Mg ha-1), followed by the mixed-species stand (7.6 Mg ha-1) and secondary forest (7.3 Mg ha-1), and least litterfall was measured in the pure C. robustum stand (5.5 Mg ha-1). Litterfall seasonality varied among species in pure stands (CV from 44.7 to 91.4 %), unlike litterfall in the mixed-tree stand, where the variation was lower (CV 31.2 %). In the natural and second-growth forest, litterfall varied by 57.8 and 34.0 %, respectively. The annual rate of nutrient return via litterfall varied widely among forest ecosystems. Differences were detected between forest ecosystems in both the litter accumulation and quantity of litterlayer nutrients. The highest mean nutrient accumulation in above-ground biomass was observed in mixed-species stands. The total nutrient accumulation (N + P + K+ Ca + Mg) ranged from 0.97 to 1.93 kg tree-1 in pure stands, and from 1.21 to 2.63 kg tree-1 in mixed-species stands. Soil fertility under mixed-species stands (0-10 cm) was intermediate between the primary forest and pure-stand systems. The litterfall rate of native forest species in a mixed-species system is more constant, resulting in a more continuous decomposition rate. Consequently, both nutrient availability and quantity of organic matter in the soil are higher and the production system ecologically more sustainable.

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Effect of thinning intensity on understory herbaceous diversity and biomass in mixed coniferous and broad-leaved forests of Changbai Mountain

Forest Ecosystems ◽

10.1186/s40663-021-00331-x ◽

2021 ◽

Vol 8 (1) ◽

Author(s):

Gerong Wang ◽

Yue Sun ◽

Mo Zhou ◽

Naiqian Guan ◽

Yuwen Wang ◽

...

Keyword(s):

Seasonal Changes ◽

Mixed Forest ◽

Growing Season ◽

Total Biomass ◽

Herb Layer ◽

Simpson Index ◽

Thinning Intensity ◽

Ground Biomass ◽

Below Ground ◽

Understory Herb

Abstract Background Herbs are an important part of the forest ecosystem, and their diversity and biomass can reflect the restoration of vegetation after forest thinning disturbances. Based on the near-mature secondary coniferous and broad-leaved mixed forest in Jilin Province Forestry Experimental Zone, this study analyzed seasonal changes of species diversity and biomass of the understory herb layer after different intensities of thinning. Results The results showed that although the composition of herbaceous species and the ranking of importance values were affected by thinning intensity, they were mainly determined by seasonal changes. Across the entire growing season, the species with the highest importance values in thinning treatments included Carex pilosa, Aegopodium alpestre, Meehania urticifolia, and Filipendula palmata, which dominated the herb layer of the coniferous and broad-leaved mixed forest. The number of species, Margalef index, Shannon-Wiener index and Simpson index all had their highest values in May, and gradually decreased with months. Pielou index was roughly inverted “N” throughout the growing season. Thinning did not increase the species diversity. Thinning can promote the total biomass, above- and below-ground biomass. The number of plants per unit area and coverage were related to the total biomass, above- and below-ground biomass. The average height had a significantly positive correlation with herb biomass in May but not in July. However, it exerted a significantly negative correlation with herb biomass in September. The biomass in the same month increased with increasing thinning intensity. Total herb biomass, above- and below-ground biomass showed positive correlations with Shannon-Winner index, Simpson index and Pielou evenness index in May. Conclusions Thinning mainly changed the light environment in the forest, which would improve the plant diversity and biomass of herb layer in a short time. And different thinning intensity had different effects on the diversity of understory herb layer. The findings provide theoretical basis and reference for reasonable thinning and tending in coniferous and broad-leaved mixed forests.

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EVALUATION OF SUBSTRATES AND AMF SPORULATION IN THE PRODUCTION OF SEEDLINGS OF NATIVE FOREST SPECIES

Revista Árvore ◽

10.1590/0100-67622016000200007 ◽

2016 ◽

Vol 40 (2) ◽

pp. 245-254 ◽

Cited By ~ 2

Author(s):

Luciana de Moura Gonzaga ◽

Sarah Santos da Silva ◽

Silvane de Almeida Campos ◽

Rodrigo de Paula Ferreira ◽

André Narvaes da Rocha Campos ◽

...

Keyword(s):

Biomass Production ◽

Forest Restoration ◽

Rubber Tree ◽

Poultry Manure ◽

Native Forest ◽

Organic Substrates ◽

Forest Species ◽

Hymenaea Courbaril ◽

Significant Difference ◽

Potential Use

ABSTRACT The objective of this study was to evaluate organic substrates in the production of canafistula (Peltophorum dubium) (Spreng.) Taub, cutieira (Joannesiaprinceps Vell.), jatoba (Hymenaea courbaril L.) and rubber tree (Hevea brasiliensis M. Arg.) seedlings, native trees with potential use in forest restoration programs. The design was completely randomized with 10 substrate formulations with 4 repetitions of 3 plants for the four species. The evaluated substrates consisted of soil, bovine manure (BM), poultry manure (PM), chemical fertilizer (CF) and sand, in different proportions. The experiment was concluded at the end of 180 days for canafistula, cutieira and rubber and 210 days for jatoba. At the end of these periods, the root (RDM), shoot (SDM) and total (TDM) the dry matters of the seedlings were determined. Quantification of AMF spores and normalization between samples through SPORES/RDM correction were also performed. The Scott-Knott test at 5% probability was applied. Regarding biomass production, only canafistula had significant difference among the tested substrates. In relation to sporulation, the highest values were observed in cutieira and rubber tree in substrate containing PM. The substrates composed of 40 or 50% soil + 20% sand + 30% or 40 PM for canafistula; 50% soil + 20% sand + 30% PM for cutieira; and for jatoba and rubber tree 60% soil + 20% sand + 20% PM, enabled the best results in terms of biomass production in seedlings and AMF sporulation.

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Resposta de Handroanthus heptaphyllus Mattos em diferentes volumes de substrato e adubação de base.

FLORESTA ◽

10.5380/rf.v50i4.65644 ◽

2020 ◽

Vol 50 (4) ◽

pp. 1770

Author(s):

Thaise Da Silva TONETTO ◽

Maristela Machado Araujo ◽

Álvaro Luís Pasquetti Berghetti ◽

Márcio Carlos Navroski

Keyword(s):

Controlled Release ◽

Quality Index ◽

Lower Cost ◽

Dry Mass ◽

High Dose ◽

Native Forest ◽

Forest Species ◽

Definition Of ◽

Appropriate Practices ◽

Dickson Quality Index

Handroanthus heptaphyllus (Martius) Mattos response in different volumes of substrate and base fertilization. The native forest species require the adoption of appropriate practices in the nursery, such as the definition of the container volume and base fertilizer, to develop seedlings at lower cost. Thus, this study aimed to verify the performance of Handroanthus heptaphyllus seedlings grown in nurseries in different sizes of containers and different dosage of controlled release fertilizer (CRF). There was interaction between the volume of container and the fertilization for the height (H), stem diameter (SD), and H/SD relation. The shoot dry mass variable (SDM), root dry mass (RDM), total dry mass (TDM), SDM/RDM relation, Dickson quality index (DCI) and leaf area (LA) were influenced only by the base fertilizer. The highest values for these variables were, respectively, 15.68 cm; 6.55 mm, 2.58 cm mm-1; 2.05 g; 2.03 g; 3.84 g; 1.46; 1.15 and 246.97 cm². The H. heptaphyllus species is nutritionally demanding, positively responding to the high dose of CRF. Seedlings of H. heptaphyllus produced in tubes of 180 cm³ with 7.0 g L-1 of CRF present adequate growth.

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Effects of Fertilization on Biomass and Macronutrient Content of Eucalyptus urophylla S.T. Blake in Arenized Soil of Pampa Biome

Journal of Experimental Agriculture International ◽

10.9734/jeai/2019/v35i630223 ◽

2019 ◽

pp. 1-10

Author(s):

Huan Pablo de Souza ◽

Mauro Valdir Schumacher ◽

Aline Aparecida Ludvichak ◽

Dione Richer Momolli ◽

Claudiney Do Couto Guimarães ◽

...

Keyword(s):

Biomass Accumulation ◽

Stem Bark ◽

Total Biomass ◽

Eucalyptus Urophylla ◽

Stem Wood ◽

Randomized Design ◽

Pampa Biome ◽

Biomass Determination ◽

To Receive

The objective of this study was to quantify the biomass and the macronutrient stock in an experiment of fertilization with Eucalyptus urophylla, planted in arenized soil at 12 months-old, in Rio Grande do Sul, Brazil. The experiment had a completely randomized design with five treatments (T1, T2, T3, T4 and T5) with three replications. The treatments T2, T3, T4 and T5, received increasing doses of triple superphosphate. On the other hand, the T1 treatment was the only one to receive natural phosphate in planting. For the determination of the biomass, fifteen trees were felled and separated in the following components: leaves, branches, stem bark, stem wood and roots. Samples of the components were collected and transported to the laboratory for biomass determination and chemical analysis. The total biomass varied between the treatments, with highest biomass accumulation of 6.83 Mg ha-1 occurring in T5. The T1 presented the highest biomass for roots representing 33.4% of the total biomass. The biomass distribution among the different components in the decreasing order was: roots > stem wood > leaves > branches > stem bark, for all the treatments. The treatment with higher doses of fertilizers (T5) presented the highest amount of nutrient accumulation in the total biomass (131.26 kg ha-1). The concentration and accumulation of nutrients presented the following trend K > N > Ca > Mg > P > S. Analyzing the different components of biomass, the highest amounts of nutrients followed the order: leaves > roots > stem wood > branches > stem bark. Fertilization influenced the biomass production of E. urophylla in arenized soil in the Pampa biome, but without significant differences to date (12 months). The leaves had the highest concentration of macronutrients, with the exception of Ca, which was higher in the bark. The K was the element that presented highest accumulation in whole tree. The plantation of eucalyptus with fertilization management may be an alternative for the economic use of arenized soil.

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GROWTH AND NUTRITION OF Paratecoma peroba SEEDLINGS IN DIFFERENT TUBE VOLUMES AND CONTROLLED-RELEASE FERTILIZERS

FLORESTA ◽

10.5380/rf.v50i3.65120 ◽

2020 ◽

Vol 50 (3) ◽

pp. 1613

Author(s):

Thais Arão Feletti ◽

Emanuel França Araújo ◽

Elzimar De Oliveira Gonçalves ◽

Thamara Arão Feletti ◽

Aline Ramalho Dos Santos ◽

...

Keyword(s):

Controlled Release ◽

Nutrient Balance ◽

Mineral Fertilizer ◽

Integrated System ◽

Native Forest ◽

Forest Species ◽

Randomized Design ◽

Growth And Nutrition ◽

Nutritional Balance ◽

Balance Index

Paratecoma peroba is a native forest species of great economic and ecological interest, currently at risk of extinction from selective and illegal exploitation; however, there are no established parameters for the production of seedlings of this species. The objective of this study was to analyze the growth and nutritional balance of P. peroba seedlings grown in polypropylene tubes of different sizes with variable doses of controlled-release fertilizer (CRF). Three volumes of tubes (120, 180, and 280 cm3), four CRF doses (0, 2.5, 5, and 7.5 kg m-3), and a conventional mineral fertilizer (CF) were tested as indicated in the literature for native forest species: arranged in a completely randomized design in a 3 × 5 factorial scheme, with four replicates composed of 16 seedlings. After 180 days, the percentage of survival, growth variables, indices of the diagnosis and recommendation integrated system, and the average nutrient balance index of the seedlings were analyzed. Based on the total dry matter and the mean nutritional balance index, the combination of a 280 cm³ tube with a 7.5 kg m-3 CRF dose was the most effective in the production of P. peroba seedlings.

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Comparison of a Population of Eastern Red-backed Salamanders, Plethodon cinereus, under Native Dominant Wood Coverboards and Natural Cover Objects

The Canadian Field-Naturalist ◽

10.22621/cfn.v123i3.966 ◽

2009 ◽

Vol 123 (3) ◽

pp. 210 ◽

Cited By ~ 5

Author(s):

Jean-David Moore

Keyword(s):

North America ◽

Age Structure ◽

Sugar Maple ◽

Good Method ◽

Plethodon Cinereus ◽

Eastern North America ◽

Native Forest ◽

Forest Species ◽

Population Demographics ◽

Significant Difference

Artificial cover objects or coverboards have been widely used to study Eastern Red-backed Salamanders (Plethodon cinereus), a species that is very abundant in eastern North America and known to be one of the most common vertebrates within its geographical range. However, recent studies have suggested that potential bias may be associated with the use of coverboards compared with natural cover objects. In this study, age structure and body size (weight and snout-vent length, SVL) of P. cinereus found under coverboards and natural cover objects at Lake Clair (Quebec, Canada) were compared. Coverboards were made of Sugar Maple (Acer sacchrum), a native forest species dominant in the study area. In 2004 and 2005, a total of 162 P. cinereus were found under coverboards, and 156 P. cinereus were found under natural cover objects. No significant difference in the age structure, mean weight, or SVL of P. cinereus was observed between the two sets. This study suggests that the type of coverboard used at Lake Clair is a good method to obtain an accurate index of P. cinereus population demographics, and is similar to that expected under natural cover objects. This technique should help to establish a standard protocol that could better allow direct comparisons among studies in the future. However, more studies are needed to explain the high proportion of adult specimens found under both cover types at Lake Clair relative to studies in other regions in North America.

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Growth Characteristics of Three Macrophyte Species Growing in a Natural and Constructed Wetland System

Water Science & Technology ◽

10.2166/wst.1994.0166 ◽

1994 ◽

Vol 29 (4) ◽

pp. 95-102 ◽

Cited By ~ 27

Author(s):

P. W. Adcock ◽

G. G. Ganf

Keyword(s):

Constructed Wetland ◽

Tissue Concentration ◽

South Australia ◽

Nutrient Concentrations ◽

Winter Period ◽

Total Biomass ◽

Natural Wetland ◽

Nitrogen And Phosphorus ◽

Standing Biomass ◽

Below Ground

Total, above and below ground biomass, growth, and tissue nutrient concentration of three species growing in two contrasting environments (a horizontal flow, constructed wetland fed tertiary effluent at Bolivar, South Australia, and a natural wetland, Bool Lagoon, south-eastern South Australia) were compared to determine relative performance of each species. Overall Baumea articulata and Phragmites australis performed poorly in trenches compared with natural wetland. Total biomass was 4.0 and 2.7, compared with 7.7 and 10.9 kg/m2 however, above ground (AG)/below ground (BG) ratios were similar at both locations (1 (Baum) and 0.42(Phrag)). Below ground mass was restricted to the top 25cm in the trenches but penetrated to > 50cm in the natural wetland. Phragmites showed a marked decline in standing biomass during the winter period in both environments but Baumea increased standing biomass in the trenches. Although the mean tissue nutrient concentrations of N and P for plants grown in trenches were higher than their natural counterparts [3.18(Baum), 2.56(Phrag) vs. 0.68(Baum), 0.49(Phrag) mg P/g DWt.; 12.99(Baum), 23.06(Phrag) vs. 5.39(Baum), 8.92(Phrag) mg N/g DWt.], this was offset by the lower biomass of the plants in the trenches. In contrast, the semi-emergent Triglochin procerum performed exceptionally well in the trenches, compared with the other species, and with itself growing in Bool Lagoon. Total biomass was 15.4 kg/m2, AG/BG ratio was 6. Triglochin continued to grow vigorously throughout the winter and had a mean tissue concentration of 5.19 mg P, 22.63 mg N and 368 C/g dry weight. These data suggest that the effective removal of nitrogen and phosphorus by harvesting was 5 times higher for Triglochin than for Baumea or Phragmites in the trenches. The nitrogen concentrations in Triglochin suggest a protein content of 16–18% which compares favourably with lucerne.

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APLICAÇÃO DE FERTILIZANTE DE LIBERAÇÃO LENTA NO ESTABELECIMENTO DE MUDAS DE IPÊ-ROXO E ANGICO-BRANCO EM ÁREA DE DOMÍNIO CILIAR

FLORESTA ◽

10.5380/rf.v41i2.21874 ◽

2011 ◽

Vol 41 (2) ◽

Cited By ~ 1

Author(s):

Aletéia Lang ◽

Ubirajara Contro Malavasi ◽

Vanessa Decker ◽

Paula Vergili Pérez ◽

Maicon Antonio Aleixo ◽

...

Keyword(s):

Slow Release ◽

Native Forest ◽

Initial Growth ◽

Slow Release Fertilizer ◽

Below Ground ◽

Number Of Leaves ◽

Collar Diameter ◽

Non Destructive ◽

Root Collar ◽

Modern Tool

O uso de fertilizantes de liberação controlada constitui-se em uma das modernas técnicas na produção de mudas. Porém existem poucos relatos de seus efeitos sobre o crescimento inicial de espécies florestais nativas em área de domínio ciliar. O estudo objetivou comparar os efeitos de diferentes fertilizantes de liberação lenta (FLL) com uma formulação convencional no crescimento a campo de mudas de Anadenanthera colubrina e Tabebuia avellanedae. As mudas foram plantadas com 55 g por cova de Basacote 3M, Basacote 6M, Basacote 9M, formulação 16-8-12, e uma testemunha (sem fertilização). As mensurações não destrutivas incluíam os incrementos em altura, diâmetro do coleto e número de folhas aos 90, 180, 270 e 360 dias após o plantio, e avaliações destrutivas da massa seca aérea e radicular em mudas escavadas aos 180 e 360 dias após o plantio. Os resultados revelaram maior incremento para o diâmetro do coleto e o número de folhas em A. colubrina com FLL, enquanto que mudas de T. avellanedae expressaram maiores respostas em incrementos de altura. As biomassas secas da raiz e aérea não foram influenciadas pela adição de fertilizantes na cova, apresentando apenas diferenças entre as espécies.Palavras-chave: Crescimento inicial; Anadenanthera colubrina; Tabebuia avellanedae; fertilizante de liberação lenta. AbstractEffects of fertilizers applied to ipe roxo and angico during their seedlings planting. Slow release fertilizer (SRF) is a modern tool for seedling production. However, there are few reports on the effects of its application on initial growth of native forest species planted on repairing areas. The aim of this experiment was to compare the effects of SRF and a conventional fertilizer on initial growth of fields planted with Anadenanthera colubrine and Tabebuia avellanedae seedlings. Treatments included 55 g per planting hole of Basacote 3M, Basacote 6M, Basacote 9M, conventional fertilizer NPK (16-8-12) and a control (no fertilizer). Non destructive measurements included increments of root collar, length, and number of leaves at 90, 180, 270 and 360 days after planting date. Destructive measurements included dried biomass of above and bellow ground tissues, root length, and leaf area of three seedling randomly selected from each treatment. The results showed higher increments in root collar diameter and number of leaves for A. colubrine with SRF while T. avellanedae seedlings showed higher increments in plant height. Differences in relation to above and below ground dry masses were detected only between species at 180 and 360 days after planting date.Keywords: Initial growth; Anadenanthera colubrina; Tabebuia avellanedae; slow release fertilizer.

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