Resumo Para explorar os atributos físicos e químicos do solo e espacializar o estoque de carbono orgânico do solo em um trecho de Floresta Atlântica (Estacional Semidecidual Submontanal, Espírito Santo, Brasil), este estudo avaliou quatro camadas de solo (0-5, 5-10, 10-20 e 20-40 cm), as inter-relações dos atributos físicos e químicos e a espacialização do estoque de carbono orgânico do solo aplicando a interpolação por “cokrigagem”. Foram coletadas 12 amostras em cada camada de solo, sendo determinados os teores de nutrientes, a densidade do solo, a textura e o teor de carbono orgânico, sendo também determinado o estoque de carbono. Os atributos do solo mais significativos na variação dos dados foram verificados pela ordenação por Análise de Componentes Principais (ACP) agrupando as parcelas semelhantes quanto às características físicas e químicas. Com base na autocorrelação espacial dos atributos do solo, os dados do modelo de elevação digital (altitude e declividade) para o local estudado foram combinados para explorar a relação de coordenadas entre os parâmetros do terreno e o estoque de carbono orgânico do solo. Foi verificado o aumento da fertilidade do solo paralelo ao aumento do teor de matéria orgânica, auxiliando no entendimento das diferenças e similaridades dos sítios identificados no campo. Observa-se diferença espacial no estoque de carbono orgânico do solo, sendo o maior verificado nas áreas de menor declividade e altitude.

Abstract This study aimed to explore the physical and chemical attributes of the soil and to spatialize the soil organic carbon stock in a stretch of Atlantic Forest by evaluating four soil layers and the interrelationships of physical and chemical attributes as well as the spatialization of soil organic carbon stock by applying cokriging interpolation. Thus, 12 soil samples were collected in a soil layer, and the nutrient content, soil density, texture, soil organic carbon content and the soil carbon stock were determined. A Principal Component Analysis (PCA) grouped the most similar plots in terms of physical and chemical characteristics. Based on the spatial autocorrelation of the soil attributes, the digital elevation model data (altitude and slope) for the studied site were combined to explore the coordinate relationship between the terrain parameters and the soil organic carbon stock. We verified an increase in the soil fertility parallel to the increase in the organic matter content in the soil, helping to understand the differences and similarities of the identified sites in the field. There is a spatial difference in the soil organic carbon stock, with the largest being observed in areas of lower slope and altitude. The physical and chemical attributes of the soil in the Atlantic Forest varied according to the sampled points, being strongly related to the relief. The spatial variability altered soil organic carbon stocks in the forest under study.

Resumo A dinâmica de serapilheira é um dos processos fundamentais para o crescimento e manutenção de fragmentos florestais nativos, sendo considerada a principal via da ciclagem de nutrientes em florestas. Dessa forma, estudos sobre produção de serapilheira e conteúdo de nutrientes fornecem subsídios que proporcionam um melhor entendimento da dinâmica dos nutrientes. O objetivo do estudo foi identificar a sazonalidade e as condições meteorológicas que influenciam na quantifidade e no retorno de nutrientes através da serapilheira em um fragmento de Floresta Atlântica. A amostragem de serapilheira foi realizada mensalmente em 12 parcelas permanentes. Cada parcela continha 5 coletores distribuídos sistematicamente. A serapilheira foi classificada, quantificada a massa seca e nutrientes nas frações folhas e galhos + miscelânea. Foi constatado comportamento sazonal com as maiores deposições na estação do inverno. A produção média anual foi de 6,78 Mg ha-1, sendo 64,9% composta por folhas. A entrada média de nutrientes anual foi de 135.1, 115.7, 39.7, 23.5, 17.6 e 4.6 kg ha-1 para Ca, N, K, Mg, S e P respectivamente. A variável meteorológica precipitação apresentou influencia no padrão de deposição. O aumento na eficiência do uso de nutrientes no segundo ano em comparação com o primeiro indica que as plantas estrategicamente podem estar retranslocando quantidades relativas de seus nutrientes sob condições de estresse hídrico.

Abstract Litter dynamics is one of the fundamental processes for the growth and maintenance of native forest fragments, being considered the main pathway for nutrient cycling in forests. Studies on litter production and nutrient content therefore provide insights that provide a better understanding of nutrient dynamics. This study identifies the seasonality and meteorological conditions that influence the quantity and return of nutrients through litter in an Atlantic Forest fragment. Litter sampling was carried out monthly in 12 permanent plots. Each plot contained 5 littertraps distributed systematically. The litter was classified, and the dry mass and nutrients in the leaves and branches and miscellaneous fractions was quantified. Seasonal behavior was observed, with the highest depositions in the winter season. The average annual production was 6.78 Mg ha-1, with 64.9% being composed of leaves. The mean annual nutrient intake was 135.1, 115.7, 39.7, 23.5, 17.6 and 4.6 kg ha-1 for Ca, N, K, Mg, S and P, respectively. The meteorological variable precipitation influenced the deposition pattern. The increase in nutrient-use efficiency in the second year compared to the first indicates that plants strategically may be re-translocating relative amounts of their nutrients under water stress conditions.

Resumo O trabalho objetivou quantificar variáveis fisiológicas e bioquímicas, com potencial de aplicação operacional em viveiros de mudas clonais de eucalipto na fase de expedição e estudar sua relação com variáveis biométricas avaliadas durante o crescimento inicial em campo. Foram utilizadas mudas produzidas por miniestaquia apical de dois clones comerciais híbridos de Eucalyptus grandis x Eucalyptus urophylla, cultivadas em tubetes de 53 cm3 com substrato orgânico. O estudo se consistiu de avaliações em viveiro, laboratório e em campo aos 0, 30, 60, 90 e 120 dias, após o plantio. Os dados foram submetidos à análise de variância e quando significativos submetidos ao teste Tukey a 5% de probabilidade. Variáveis relativas ao padrão de rusticidade de mudas, utilizadas de forma subjetiva por viveiristas, foram quantificadas e validadas no viveiro e no campo. Diferenças entre clones foram observadas para as variáveis avaliadas. O teor de carboidratos e o índice de fluorescência foliar não variaram significativamente entre as classes de índice de clorofila. O teor de nitrogênio foliar, proteínas e o potencial hídrico foram diretamente proporcionais ao índice de clorofila. Concluiu-se que a tonalidade da copa das mudas pode ser relacionada com a rusticidade e que a tonalidade esverdeada é mais indicada por possuir uma maior rusticidade.

Abstract The work aimed to quantify physiological and biochemical variables, with potential for operational application in eucalypt clone seedling nurseries, during the expedition phase and to study their relationships with biometric variables evaluated during the initial growth in the field. Seedlings produced by apical mini-cuttings of two hybrid commercial clones of Eucalyptus grandis x Eucalyptus urophylla were used, cultivated in 53 cm3 tubes with organic substrate. The study consisted of evaluations in nursery, laboratory and in the field at 0, 30, 60, 90 and 120 days after planting. The data were submitted to analysis of variance and, when significant, were submitted to the Tukey test at 5% probability. The variables related to the seedling rusticity pattern, used subjectively by nurserymen, were quantified and validated in the nursery and in the field. The differences between clones were observed for the evaluated variables. The carbohydrate content and the leaf fluorescence index did not vary significantly between the classes of chlorophyll index. Leaf nitrogen content, proteins and water potential were directly proportional to the chlorophyll index. It was concluded that the canopy color of the seedlings may be related to rusticity and that the greenish tonality is more indicated because it has greater rusticity.

Abstract The objective of this study was to analyse the initial medium-term growth of a P. reticulata settlement under different phosphorus doses. The experiment was carried out in an area of Atlantic Forest, Sooretama, Northern Espírito Santo State, Brazil. Five doses of P per each tree (0 g, 27 g, 47 g, 67 g and 87 g) were tested in a randomized block design with three replicates and 18 plants per plot. At 3 months, 9 months and 15 months, height and diameter were measured at the soil level. At 36 months height, diameter at breast height, survival, basal area, and nutritional evaluation of the trees were measured. A logistic model was also used to model the growth in height of individual trees and a logistic model considering fixed effects and mixed form (fixed and random effects), in order to verify if the inclusion of the random effect (tree) would result in gains in terms of accuracy in the estimation of the future height of P. reticulata trees. The species presents potential for use in reforestation programs under edaphoclimatic conditions tested and under similar conditions. The species was not very demanding in P, and the addition of this nutrient promotes negative effects on its growth in the short and medium term. Regarding the model of growth in height, the logistic model adjusted in the mixed form showed to be superior to the traditional adjustment.

Resumen El objetivo de este estudio fue analizar el crecimiento inicial a mediano plazo de un asentamiento de P. reticulata bajo diferentes dosis de fósforo. El experimento se llevó a cabo en un área del Bosque Atlántico, Sooretama, norte del estado de Espírito Santo, Brasil. Se probaron cinco dosis de P por árbol (0 g, 27 g, 47 g, 67 g y 87 g) en un diseño de bloques al azar con tres repeticiones y 18 plantas por parcela. A los 3 meses, 9 meses y 15 meses se midió la altura y el diámetro a nivel del suelo. A los 36 meses de la siembra, se midió el diámetro a la altura del pecho, la supervivencia y el área basal y se hizo una evaluación nutricional de los árboles. También se utilizó un modelo logístico para modelar el crecimiento en altura de árboles individuales y el modelo logístico considerando efectos fijos y forma mixta (efectos fijos y aleatorios) para verificar si la inclusión del efecto aleatorio (árbol) resultaría en ganancias en términos de precisión en la estimación de la altura futura de los árboles de P. reticulata. La especie presenta potencial para su uso en programas de reforestación en condiciones edafoclimáticas probadas y en condiciones similares. La especie no fue muy exigente en fósforo y la adición de este nutriente promovió efectos negativos en su crecimiento a corto y mediano plazo. Con respecto al modelo de crecimiento en altura, el modelo logístico ajustado en forma mixta mostró ser superior al ajuste tradicional.

ABSTRACT The usual propagation method for Dalbergia nigra is via seedings; however, the seasonal supply has a variable quantity of seeds which limits the continuous production of seedlings. Therefore, the objective of this study was to establish a vegetative propagation protocol via mini-cuttings technique for D. nigra from juvenile shoots obtained from seedlings. The experimental design was completely randomized in a 2 x 2 x 4 factorial scheme, with two geographical origins: two controlled release fertilizer doses (4.0 and 8.0 g.dm-³) and four indole-3-butyric acid (IBA) concentrations (0; 2,000; 4,000; and 6,000 mg.Kg-1), with four replications. The mini-cuttings were removed from the tubes after 60 days of propagation in the greenhouse, and the substrate was completely removed by washing in running water to observe the roots. The survival percentage, rooting, rooting speed and variables related to mini-cuttings vigor (largest root length (RL, cm.plant-1), number of roots (NR), surface area (SA, mm2), root volume (RV, mm³) and root dry mass (RDM, g.plant-1) were measured. The results indicated that D. nigra has an aptitude for vegetative propagation by mini-cuttings with survival values and rooting greater than 70%. Geographical origins present a different set of responses for survival, rooting and vigor of mini-cuttings. Stock plant nutrition influences mini-cuttings root growth. IBA concentrations did not promote an effect on the mini-cuttings rooting percentage; however, exogenous auxin at the dose of 6,000 mg.Kg-1 provided mini-cuttings with greater vigor in their radical system. Nonetheless, further research is suggested to define the feasibility of using this regulator in the vegetative propagation of this species.

ABSTRACT Paratecoma peroba is a native forest species of great economic and ecological interest, currently at risk of extinction. In addition to the difficulty of finding adult individuals of this species, plant production is limited, so the use of mini-cuttings can facilitate the spread of P. peroba. Thus, the objective of this study was to analyse the effect of different doses of controlled release fertilizer (CRF) on rooting, growth, photosynthetic metabolism and nutritional balance of P. peroba clones propagated by mini-cuttings. Five doses of CRF (0, 2, 4, 6 and 8 kg.m-3) were tested, arranged in a completely randomized design with 12 repetitions and each repetition consisted of eight clones. Evaluations were carried out in the three stages of clones production: 1) Survival at 60 days in a greenhouse, 2) Rooting at 105 days in a shade house; and 3) Evaluation Productivity index, morphological variables, physiological metabolism, and nutritional through macronutrient contents, diagnosis and recommendation integrated system (DRIS) indices and the average nutritional balance index of clones at 120 days in the area of hardening. There was no influence of CRF on survival and rooting of mini-cuttings. The CRF favoured a higher productivity index, vegetative growth and physiological activity of the clones. The 6 kg.m-3 dose was sufficient to obtain nutritionally balanced clones.

ABSTRACT The Atlantic Forest is a biome that has suffered anthropic actions, such as the extraction of hardwood, which can lead to the extinction of endemic species of great economic and ecological value, such as Dalbergia nigra. In this perspective, large-scale multiplication studies are necessary to contribute to the conservation of this species. The objective of this work was to establish a protocol for the in vitro production of axenic seedlings of D. nigra. Four experiments were performed: I. Immersion times in NaOCl. II. Disinfecting agents in seed germination of D. nigra. III. NaOCl toxicity in seeds of the model species Lactuca sativa L. IV. Culture media and glutamine in the germination and initial growth of D. nigra. All experiments were arranged in a completely randomized design. For a better disinfestation and less harmful effects to the seedlings, it is recommended that the seeds be treated with 70% alcohol (1 min) and NaOCl (14 min). NaOCl has a high phytotoxic, cytotoxic, and genotoxic effect, and its mechanism of action in the L. sativa cell cycle is clastogenic and aneugenic, suggesting the formation of abnormal seedlings in D. nigra. The WPM medium and its supplementation with glutamine (0.75 mg.L-1) are recommended.

ABSTRACT Melanoxylon brauna is propagated by seeds, however, low yield, pest attack and short viability are problems in seedling production. In vitro cultivation is an alternative for large-scale seedling production, but studies with this species are scarce. The aim of the work was to analyze the in vitro morphogenesis of braúna. Explants after induction of growth regulators. Three experiments were performed: I. In vitro bud proliferation of juvenile explants at different BAP concentrations. Was analyzed the number and length of shoots (mm); bud explants-1 (%); calogenesis (%) and direct and indirect organogenesis budding-1 (%). II. In vitro rhizogenesis of shoots with different types and auxin concentrations. III. In vitro rhizogenesis of under temporary immersion of shoots at different IBA concentrations. It was analyzed in experiment I and II: calogenesis (%); rhizogenesis (%); number, length (mm) and root dry mass (mg) the shoots. The nodal segment with two axillary buds was the most responsive explant regardless of the use of BAP. The stem apex with the use of BAP (2.5-3.5 mg.L-1) was the most responsive in the proliferation of shoots. Tested concentrations of auxins IBA, NAA and 2,4-D were not sufficient for in vitro rhizogenesis. The average of the maximum technical efficiencies of the variables used to analyze rhizogenic process suggests the treatment of the shoots base by temporary immersion in the IBA at an approximate concentration of 2,500 mg.L-1 and planting on the vermiculite substrate.

Abstract Our study sought to evaluate the rooting capacity of indole butyric acid (IBA)-treated stem cuttings and the efficiency of the vegetative rescue technique of adult and transitional parent trees of Lecythis pisonis. Softwood, hardwood, and semi-hardwood leafless cuttings treated with IBA (0; 2,000; 4,000; 6,000; and 8,000 mg kg-1) were tested in a randomized block design with four replicates and 10 cuttings per plot. The growth of epicormic shoots was also evaluated in 60-cm branches removed from the tree canopy and kept in greenhouse for 60 days. Cuttings from adult trees did not form roots. Softwood cuttings from transitional trees had a very low rooting percentage. In both cases, no influence of IBA concentrations were observed. The use of the sectioned-branch technique was feasible for inducing sprouts.

ABSTRACT Paratecoma peroba is a native Brazilian forest species of great economic and ecological interest, which is currently at risk of extinction owing to excessive wood exploration. The use of the mini-cutting technique could facilitate the vegetatively propagation of this species. The objective of the present study was to establish a vegetative propagation protocol for P. peroba using the mini-cutting technique. In the first experiment, were tested five concentrations of indolbutiric acid (IBA; 0, 1, 2, 4 and 8 g.L-1) and two types of substrates (sand and a commercial substrate based on ground Pinus bark, coconut powder, and mineral additives). In the second experiment, were tested three types of mini-cuttings (apical of 6 cm and 10 cm, and intermediary of 4 cm) and two leaf area sizes (total leaf area and reduced to 50% of leaf area). The results showed that P. peroba could be vegetatively propagated using the mini-cutting technique with up to 82.5% rooting. There was only 5.6% of mini-cutting rooted in sand. High concentrations of IBA promotes decrease in rooting and number of roots. The 10 cm apical mini-cuttiing tend to form clones with better quality standards. The maintenance of the leaf area promotes the attainment of roots with greater root surface area, volume and dry mass of P. Peroba plants.

ABSTRACT Melanoxylon brauna is a tree species native to the Atlantic Forest of high ecological and economic value. The objective of this study was to evaluate the growth and nutritional status of seedlings of two Melanoxylon brauna cultivars grown in substrate with different controlled-release fertilizer doses (CRF). The experiment was arranged in a randomized block 4 × 2 factorial design, with four CRF doses (0, 2, 4, and 8 kg m-3) and two seed origins (Viçosa-MG and Linhares-ES), with four replicates and 126 seedlings per plot. At 60, 90, and 120 days after emergence, seedlings were collected to measure variables related to emergence, growth, and nutrition. The greatest growth and best nutritional status were found for seedlings originated from seeds collected in Linhares at CRF dose of 8 kg m-3. On the other hand, seedlings originated from seeds collected in Viçosa showed low emergence and high plant mortality.

O uso de mudas bem nutridas e de qualidade, é um dos fatores que contribui para o sucesso da implantação de plantios florestais. Neste estudo, objetivou-se verificar por meio de características morfológicas, os efeitos dos nutrientes nitrogênio, fósforo e potássio no crescimento de mudas do jacarandá-da-bahia (Dalbergia nigra ((Vell.) Fr. All. para estabelecer a dose ideal de cada nutriente a ser adicionada em diferentes substratos, visando a garantir a produção de mudas com melhor qualidade. Para tanto, as mudas foram produzidas, em três tipos de solos: Argissolo Vermelho-amarelo mestrófico (PVAm), Latossolo Vermelho-amarelo álico (LVAa) e Latossolo Vermelho-amarelo distrófico (LVAd). O experimento foi conduzido em casa de vegetação no período de fevereiro de 2006 a junho de 2006. Foram delimitados 11 tratamentos, segundo uma matriz baconiana, onde se variaram os nutrientes (N, P e K) em três doses diferentes e dois tratamentos adicionais (zero e referência). Adotou-se o delineamento inteiramente casualizado com quatro repetições. As mudas foram plantadas em vasos com capacidade de 2,1 dm³, e após 120 dias da semeadura foram coletados as dados. Após análise dos dados, concluiu-se que para a produção de mudas de jacarandá-da-bahia recomenda-se a adição doses iguais ou superiores a 600 mg.dm-3 de P e 200 mg.dm-3 de N, quando se usar terra de subsolo na produção de mudas, provenientes de Latossolo Vermelho-amarelo e 300 mg.dm-3 de P e 90 mg.dm-3 de N quando usar Argissolo Vermelho-amarelo. Quanto à adição de K, como as mudas se mostraram pouco exigentes, ou os teores disponíveis nos solos foram suficientes para o suprimento de suas necessidades, recomenda-se a aplicação de dose mínima testada que é de 50 mg.dm-3 de solo, até que novos estudos com dose inferiores a esta sejam testados.

The use of well-nourished and quality seedlings is one of the factors that contribute to the successful implementation of forest plantations. The present study aimed to verify, by means of morphological characteristics, the effects of nitrogen, phosphorus and potassium on the growth of jacarandá-da-bahia seedlings (Dalbergia nigra ((Vell.) Fr. All. in order to establish the optimal dose of each nutrient to be added in different substrates thus aiming to ensure the production of seedlings with better quality. The seedlings were produced in three types of soils: mesotrophic Ultisol (PVAm), Alic Oxisol (LVAa) and distrofic Oxisol (LVAd). The experiment was conducted under greenhouse conditions from February to June of 2006. 11 treatments were defined according baconian matrix, in which the nutrients (N, P and K) ranged in three different doses and two additional treatments (Zero and Reference). A completely randomized design with four replications was adopted. The seedlings were planted in pots with a capacity of 2.1 dm³ and 120 days after sowing the data was collected. After analyzing the data, it was concluded that for the production of jacarandá-da-bahia seedlings it is recommended an addition of dosages greater than or equal to 600 mg.dm-3 of P and 200 mg.dm-3 of N when using underground earth in the production of seedlings, from distrofic Oxisol and 300 mg.dm-3 of P and 90 mg.dm-3 of N when using mesotrophic Ultisol. As for the addition of K, since the seedlings were undemanding or the available contents in the soil were sufficient to supply their needs, it is recommended the application of the minimum tested dose of 50 mg.dm-3 of soil until further studies with lower doses is tested.

Na produção de mudas com qualidade, um aspecto importante são os substratos utilizados, pois estes precisam ter condições físicas e químicas adequadas às plantas. Dentro desse contexto, alguns materiais orgânicos vêm sendo utilizados em misturas de substratos para a produção de mudas. Desta forma, objetivou-se analisar o uso de substratos com materiais orgânicos no crescimento de mudas de timbó (Ateleia glazioviana Baill), em comparação ao substrato que contenha somente fertilizantes minerais. Para tanto, foram testados 11 tratamentos, variando-se a composição dos substratos com a mistura de diferentes proporções de materiais orgânicos: lodo de esgoto, esterco bovino e substrato comercial, e também só aplicação de fertilizante químico. Tais tratamentos foram dispostos no delineamento inteiramente casualisado com quatro repetições e com três mudas por repetição. A partir dos resultados observados, recomenda-se adicionar esterco bovino curtido ao menos 20% do volume do substrato na composição de substratos para produção de mudas de Ateleia glazioviana.

Substrates play an important role in the production of quality seedlings, because they need to present appropriate physical and chemical conditions for plant development. In this context, some organic materials have been used in the composition of substrates for seedling production. This study aimed to analyze the use of substrates with organic materials compared with substrates containing only mineral fertilizers on the growth of Timbo (Ateleia glazioviana Baill) seedlings. To this end, 11 treatments were tested, varying the composition of substrates with the mixture of different proportions of organic materials: sewage sludge, cattle manure and commercial substrate, and also only with application of chemical fertilizers. These treatments were arranged in a completely randomized design with four replications and three seedlings per replication. Based on the results observed, we recommend the addition of cattle manure with at least 20% volume to the substrate composition for the production of Ateleia glazioviana seedlings.

A produção de mudas de espécies florestais nativas visa a atender aos plantios, principalmente para fins ambientais, tais como a recuperação de áreas degradadas. Para intensificar os conhecimentos sobre espécies com potencial de recuperação de áreas degradadas, este trabalho teve como objetivo avaliar a utilização de diferentes substratos no crescimento de mudas de Sesbania virgata (Cav.) Pers. Os tratamentos foram formulados utilizando-se lodo de esgoto, fibra de coco, vermiculita e casca de arroz in natura, além do substrato comercial. As mudas foram produzidas em tubetes com capacidade para 120 cm³. O estudo foi constituído de 14 tratamentos, com cinco repetições de cinco mudas cada, totalizando 25 plantas cada tratamento. Após 150 dias da semeadura, foram avaliadas as seguintes características nas mudas: altura; diâmetro do coleto; relação entre a altura da parte aérea e o diâmetro do coleto; massa seca da parte aérea; massa seca do sistema radicular; massa seca total; relação entre a massa seca da parte aérea e a massa seca do sistema radicular, e índice de qualidade de Dickson. Os tratamentos que continham lodo de esgoto e vermiculita em sua composição, sobretudo o tratamento T6 (60% lodo de esgoto + 40% vermiculita), proporcionaram o melhor crescimento das características morfológicas das mudas de Sesbania virgata.

The native seedlings production aims to attend plantings, mainly for environmental purposes, such as the recovery of degraded areas. To enhance the knowledge about species with potential for recovery of degraded areas, this study aimed to evaluate the use of different substrates on the growth of seedlings of Sesbania virgata (Cav.) Pers. The treatments were formulated using sewage sludge, coconut fiber, vermiculite and rice husk in natura, besides the commercial substrate. The seedlings were grown in plastic tubes with a capacity of 120 cm³. The study consisted of fourteen treatments, with five replicates of five seedlings each, in a total of 25 plants per treatment. After 150 days of sowing, the following characteristics were evaluated in seedling: height, stem base diameter, the relation between height and the stem base diameter, shoot dry matter, root dry matter, total dry matter, the relation between the shoot dry matter and root dry matter and Dickson quality index. The treatments containing sewage sludge and vermiculite in its composition, particularly the treatment T6 (60% sewage sludge + 40% vermiculite), provided the best growth of morphological characteristics of seedlings of Sesbania virgata.

O jacarandá (Dalbergia nigra (Vell.) Allemão ex Benth) é uma espécie da família Leguminosae-Fabaceae, com potencial para diversos usos, incluindo recuperação de áreas degradadas. Neste trabalho, objetivou-se verificar o crescimento das mudas de jacarandá-da-bahia sob diferentes doses dos nutrientes cálcio, magnésio e enxofre, em solos com características diferentes. O experimento foi conduzido em casa de vegetação no período de fevereiro de 2006 a junho de 2006. Os tratamentos foram delimitados segundo uma matriz baconiana, em que se variaram os nutrientes em três doses e dois tratamentos adicionais (zero e referência). Adotou-se o delineamento inteiramente casualizado com quatro repetições, num total de 44 unidades amostrais. As mudas foram conduzidas em vasos plásticos com capacidade para 2,1 dm-3 e colhidas aos 120 dias após a semeadura, sendo avaliadas diversas características morfológicas. A espécie se mostrou, em geral, pouco exigente em relação à aplicação dos nutrientes. Enquanto novos estudos, com doses menores às testadas neste, não sejam feitos, e tomando como base a massa seca total e as condições similares à desse experimento, indicam-se as doses de: 0,8 cmol c dm-3 de solo de Ca e 20 mg dm-3 de solo de S, independente do solo testado; e 0,2 e 0,8 cmol c dm-3 de solo de Mg para solos com características similares ao PVAm e LVAd, respectivamente

The jacaranda (Dalbergia nigra (Vell.) Allemão ex Benth) is a specie with potential for several uses, including recovery degraded areas. The objective of this work was to evaluate the effect of calcium, magnesium and sulfur, on the seedlings growth under different soil types. The experiment was conducted in a greenhouse from February 2006 to June 2006. The treatments were delimited according to a Baconian matrix where nutrients are varied in three different doses and two additional treatments (zero and reference). A complete randomized design with four replications was established in a total of 44 sample units. The seedlings were grown in pots with a capacity for 2.1 dm-3, and collected at 120 days after sowing and evaluated several morphological characteristics. The specie was generally undemanding regarding the application of nutrients, and the doses recommended when classified as low by the hand of fertilization. While further studies with doses lower than those tested in this, are not made, and building on the total dry mass and conditions similar to this experiment, are indicated doses: 0.8 cmolc dm-³ of soil Ca and 20 mg dm-³ of soil S, regardless of the test soil; and 0.2 and 0.8 cmolc dm-³ soil Mg to soils with similar characteristics to the PVAm and LVAd, respectively.