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Search Results: 1 - 10 of 237509 matches for " Gon?alves José Leonardo de Moraes "
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Soil attributes and wood quality for pulp production in plantations of Eucalyptus grandis clone
Gava, José Luiz;Gonalves, José Leonardo de Moraes;
Scientia Agricola , 2008, DOI: 10.1590/S0103-90162008000300011
Abstract: the soil attributes can affect the wood quality of eucalypt, which may result in considerable effect on cellulose production. this study evaluated the effect of different physical and chemical soil attributes on wood quality of eucalyptus grandis for cellulose production. five sites were selected at the western plateau of the state of s?o paulo, planted with one clone of eucalyptus grandis, with ages ranging between 6.5 and 7.0 years. four soil types, with texture ranging from sandy to very clayey were found. at each site, three experimental plots were allocated with 100 trees each. trees representative of each class frequency of diameter at breast height were harvested. their biomass and wood components were characterized. the wood productivity and quality was affected by physical attributes of soil, mainly clay content, which is directly related to the amount of available water. basic wood density did not changed at different soil types. total lignin content decreased and holocellulose content exponentially increased as soil clay content increased (until about 350 to 400 g kg-1 of clay). the wood extractives content was not affected by soil attributes. screened cellulose yield exponentially increased with soil clay content.
Produ o de mudas de espécies arbóreas nativas com combina es de adubos de libera o controlada e prontamente solúveis
Moraes Neto Sebasti?o Pires de,Gonalves José Leonardo de Moraes,Rodrigues Carlos José,Geres Washington Luiz de Azevedo
Revista árvore , 2003,
Abstract: O objetivo deste estudo foi testar diversas doses e fontes de adubo para verificar o crescimento de mudas de cinco espécies arbóreas nativas. As espécies utilizadas foram as pioneiras Guazuma ulmifolia (mutambo) e Croton floribundus (capixingui), as secundárias iniciais Peltophorum dubium (canafístula) e Gallesia integrifolia (pau-d'alho) e a clímax Myroxylon peruiferum (cabreúva). Os tratamentos consistiram principalmente na utiliza o de adubo de libera o controlada (ALC, 19-06-10, N-P2O5-K2O) de maneira pura ou em mistura com adubo em pó (AP, 14-16-18), ou AP mais aduba o de cobertura periódica (ACP, 19-06-20), comparados com aduba o convencional (aduba o de base mais aduba o de cobertura com sulfato de am nio e cloreto de potássio) e testemunha (sem aduba o). O substrato utilizado foi composto por 60% de húmus de minhoca, 30% de casca de arroz carbonizada e 10% de terra de subsolo, em base volumétrica. O recipiente que comportou o substrato foi o tubete de polipropileno de 50 cm3 de capacidade. Entre os tratamentos que produziram mudas de boa qualidade ao final do experimento, para cada espécie, aqueles com doses de 3,2 e 4,8 kg de adubo de libera o controlada por metro cúbico de substrato foram comuns a todas as espécies e, adicionalmente, resultaram em dimens es apropriadas para plantio no campo em menor tempo do que os outros tratamentos.
Equa??es para estimar a biomassa da parte aérea e do sistema radicular em povoamentos de Eucalyptus grandis em sítios com produtividades distintas
Mello, Sérgio Luis de Miranda;Gonalves, José Leonardo de Moraes;
Revista árvore , 2008, DOI: 10.1590/S0100-67622008000100012
Abstract: the main objective of this work was to adjust equations to estimate biomass of shoot and root system in 11-year-old eucalyptus grandis stands growing in two sites with different productivities. loamy soil (more productivity site) was classified as a typic hapludox (red) and sandy soil (less productivity site) as a typic quartzipsamment (qtz). biomass inventory was carried out using ten sample-trees in each site including shoot (stem, bark, leaves and branches) and root system (fine and coarse roots) tree components. two logarithmic regression equations were adjusted to estimate tree biomass, with diameter at breast height (dbh) and height (h) or dbh2h being used as independent variables. the adjusted models were significant at 95 % of probability by the t student test. the best-fit equations were found with dbh2h. validation of common equations for the two sites was based in the combined analyses of coefficient of determination (r2), stand error of estimate (sy.x) and graphic analysis of residues. adjusted equations had highest precision for estimate of stem biomass (r2 = 0.99; sy.x = 0.12) and bark biomass (r2 = 0.97; sy.x = 0.24). in spite of r2 > 0.70, equation for leaf and branch biomass had low accuracy. thus, it was suggested the inclusion of other variables related to size of trees. specific equations for biomass estimation by each site for fine [red (r2 = 0.97; sy.x = 0.30); qtz (r2 = 0.96; sy.x = 0.15)] and coarse roots [lvd (r2 = 0.98; sy.x = 0.19); rq (r2 = 0.99; sy.x = 0.15)] were more accurate than common equations, since that there was more root biomass allocation in sandy soil (qtz).
Fertiliza o de mudas de espécies arbóreas nativas e exóticas
Moraes Neto Sebasti?o Pires de,Gonalves José Leonardo de Moraes,Arthur Jr. José Carlos,Ducatti Fabiane
Revista árvore , 2003,
Abstract: Doses crescentes de fertilizante de libera o controlada (FLC) foram comparadas com fertiliza o convencional e tratamento sem fertiliza o. Estes tratamentos foram testados em mudas das pioneiras Guazuma ulmifolia (mutambo), Eucalyptus grandis e Pinus caribaea var. caribaea, da secundária inicial Peltophorum dubium (canafístula) e da clímax Calycophyllum spruceanum (mulateiro), as quais cresceram em casa de vegeta o. As mudas foram cultivadas em tubetes de 50 cm3 de capacidade, tendo como substrato uma mistura contendo 50% de húmus de minhoca, 30% de casca de eucalipto decomposta e 20% de casca de arroz carbonizada, em base volumétrica. Aos 125 dias após a semeadura, as mudas de G. ulmifolia, E. grandis e P. dubium submetidas à fertiliza o convencional apresentaram maior crescimento em altura e biomassa seca da parte aérea comparados aos dos tratamentos que receberam FLC. Contudo, para estas espécies, a biomassa seca da raiz das mudas submetidas ao tratamento convencional foram semelhantes à das mudas produzidas com as duas maiores doses de FLC (4,28 e 6, 42 kg/m3 de substrato), e a raz o entre raiz e parte aérea foi maior para a dose de 6,42 kg/m3 (FLC), comparada à do tratamento convencional para as duas primeiras espécies. O Calycophyllum spruceanum e o Pinus caribaea var. caribaea tiveram pequeno desenvolvimento em todos os tratamentos, aos 125 dias.
Produ??o de mudas clonais de eucalipto em espuma fenólica: crescimento inicial e mortalidade
Silva, Paulo Henrique Muller da;Kager, Daniel;Gonalves, José Leonardo de Moraes;Gonalves, Antonio Natal;
CERNE , 2012, DOI: 10.1590/S0104-77602012000400014
Abstract: seedling production is one of the crucial points in the forest companies and studies have been carried out to identify the most appropriate method ofproduction. the utilization ofphenolic foam in substitution ofplastic tube and organic substrate to grow eucalypt clonal cuttings was evaluated. four experiments were established, two experiments were set up in nurseries (experiments 1 and 2) and two in the field (experiments 3 and 4). all experiments were composed by four treatments: 1 - conventional system - plastic container of 55 cm3 with commercial substrate (pine bark, vermiculite and peat), 2 - small foam (60 cm3), 3 - medium foam (75 cm3) and 4 - large foam (90 cm3). in all experiments the mortality and the root and shot biomass production were evaluated. in the experiment 1, the plants in the small foam presented lower mortality rate (1%) and the conventional system showed the highest mortality rate (15%) and the large foam showed highest value of the shoot biomass. in experiment 2, the mortality rate was 40%% for the foam treatments with higher values when compared to the conventional treatment (16%). in the experiment 3, field experiment, was not observed tree mortality or differences in biomass production among the treatments. in the experiment 4, was observed better tree response to water stress of the stocks in foams, probably because their larger volume. the plants in medium and largerfoams showed 3% of mortality, while the conventional system had 25% and the shoot biomass production was highest in the larger foam treatment.
Use of phenolic foam to grow eucalypt clonal seedlings: initial growth and mortality
Paulo Henrique Muller da Silva,Daniel Kager,José Leonardo de Moraes Gonalves,Antonio Natal Gonalves
CERNE , 2012,
Abstract: Seedling production is one of the crucial points in the forest companies and studies have been carried out to identify the most appropriate method of production. The utilization of phenolic foam in substitution of plastic tube and organic substrate to grow eucalypt clonal cuttings was evaluated. Four experiments were established, two experiments were set up in nurseries (experiments 1 and 2) and two in the field (experiments 3 and 4). All experiments were composed by four treatments: 1 – conventional system – plastic container of 55 cm3 with commercial substrate (pine bark, vermiculite and peat), 2 - small foam (60 cm3), 3 - medium foam (75 cm3) and 4 - large foam (90 cm3). In all experiments the mortality and the root and shot biomass production were evaluated. In the experiment 1, the plants in the small foam presented lower mortality rate (1%) and the conventional system showed the highest mortality rate (15%) and the large foam showed highest value of the shoot biomass. In experiment 2, the mortality rate was 40% for the foam treatments with higher values when compared to the conventional treatment (16%). In the experiment 3, field experiment, was not observed tree mortality or differences in biomass production among the treatments. In the experiment 4, was observed better tree response to water stress of the stocks in foams, probably because their larger volume. The plants in medium and larger foams showed 3% of mortality, while the conventional system had 25% and the shoot biomass production was highest in the larger foam treatment.
Produ??o de mudas de espécies arbóreas nativas com combina??es de adubos de libera??o controlada e prontamente solúveis
Moraes Neto, Sebasti?o Pires de;Gonalves, José Leonardo de Moraes;Rodrigues, Carlos José;Geres, Washington Luiz de Azevedo;Ducatti, Fabiane;Aguirre Jr, José Hamilton de;
Revista árvore , 2003, DOI: 10.1590/S0100-67622003000600004
Abstract: this study aimed to test different doses and sources of fertilizers to verify the growth of seedlings of five native tree species. the species used were the pioneers guazuma ulmifolia (mutambo) and croton floribundus (capixingui), the early secondaries peltophorum dubium (canafístula) and gallesia integrifolia (pau-d'alho) and the climax myroxylon peruiferum (cabreúva). the treatments consisted mainly of the use of controlled-release fertilizers (crf, 19-06-10, n-p2o5-k2o) alone or combined with powder fertilizers (pf, 14-16-18) or with pf and periodic covering fertilization (pcf, 19-06-20) compared with conventional fertilization (base fertilization plus covering fertilization with ammnonium sulfate and potassium chloride) and control (without fertilization). the substrate was composed of 60% earthworm humus + 30% carbonized rice husk and 10% subsoil, by volume. tubes of 50 cm3 capacity were used as containers. among the treatments that produced seedlings of good quality at the end of the experiment for each species, the treatments with doses of 3,2 and 4,8 kg of controlled-release fertilizers by m3 of substrate were common to all species, also resulting in appropriate dimensions for field planting at a shorter time than the other treatments.
Volume de madeira e concentra??o foliar de nutrientes em parcelas experimentais de Eucalyptus grandis fertilizadas com lodos de esgoto úmido e seco
Silva, Paulo Henrique Muller da;Poggiani, Fábio;Gonalves, José Leonardo de Moraes;Stape, José Luiz;
Revista árvore , 2008, DOI: 10.1590/S0100-67622008000500009
Abstract: in brazil, several municipalities are building waste treatment plants and in the future thousands of tons of sewage sludge will be generated. sewage sludge is the waste left over after wastewater treatment and its disposal needs to be well planned, considering sanitary, environmental, economic and social implications. sewage sludge (biosolids) is high in organic content and plant nutrient and could be applied as fertilizer in forest plantations. the aim of this research, conducted at the experimental station of itatinga (university of s?o paulo) was to evaluate the effects of increasing doses (10, 20 and 30 tons ha-1) of wet and dry biosolids(pellets), complemented with k and b, and applied to planting rows in experimental eucalyptus grandis plots 1.5 years after seedling plantation. trunk volume increased significantly regarding the eucalypt trees that received wet and dry sewage sludge, compared to the control treatment (no fertilization), and a similar growth of eucalypt trees that received full mineral fertilization. regarding mineral nutrition, a positive correlation was observed between doses of biosolids and p, ca, and zn concentrations in the leaves, but a negative effect for mn and biosolid dose. the foliar concentration of all the nutrients in the biosolid-treated eucalypt trees remained within the limits observed in commercial plantations, with no signs of nutritional imbalance.
Fertiliza??o de mudas de espécies arbóreas nativas e exóticas
Moraes Neto, Sebasti?o Pires de;Gonalves, José Leonardo de Moraes;Arthur Jr., José Carlos;Ducatti, Fabiane;Aguirre Jr., José Hamilton;
Revista árvore , 2003, DOI: 10.1590/S0100-67622003000200002
Abstract: increasing doses of resin-coated controlled release fertilizers (crf) were compared with conventional fertilization and treatment without fertilizer. five species of tree seedlings were used: the pioneers guazuma ulmifolia (mutambo), eucalyptus grandis and pinus caribaea var. caribaea, the early secondary peltophorum dubium ("canafístula") and the climax calycophyllum spruceanum ("mulateiro"), grown in greenhouse. the seedlings were tilled in plastic tubes of 50 cm3 capacity, receiving as substrate a mixture of 50% earthworm humus, 30% decomposed eucalypt bark, and 20% carbonized rice husk (by volume). at 125 days after sowing the seedlings of g. ulmifolia, e. grandis and p. dubium submitted to conventional fertilization presented greater growth in height and shoot dry weight (stem plus leaf), in comparison with the crf treatments. however, for these same species, root dry weight of the seedlings submitted to conventional treatment was not statistically different from that of the seedlings with the two largest doses of crf (4.28 and 6.42 kg/m3 of substrate) and the root/shoot ratio was greater for dose 6.42 kg/m3, compared with the conventional treatment for the two former species. calycophyllum spruceanum and pinus caribaea var. caribaea showed little development for all treatments at 125 days.
Spatial variability of physical and chemical attributes of some forest soils in southeastern of Brazil
Alvares, Clayton Alcarde;Gonalves, José Leonardo de Moraes;Vieira, Sidney Rosa;Silva, Cláudio Roberto da;Franciscatte, Walmir;
Scientia Agricola , 2011, DOI: 10.1590/S0103-90162011000600015
Abstract: cap?o bonito forest soils, s?o paulo state, brazil, have been used for forestry purposes for almost one century. detailed knowledge about the distribution of soil attributes over the landscape is of fundamental importance for proper management of natural resources. the purpose of this study was to identify the variability and spatial dependence of chemical and physical attributes of cap?o bonito forest soils. a large soil database of regional land was raised and organized. most of the selected variables were close to the lognormal frequency range. soil texture presented a higher range in the a horizon, and the nugget effect and sill were greater in the b horizon. these differences are attributed to the parent material of the region (itararé geologic formation), which presents uneven distribution of sediments. chemical attributes related to soil fertility presented a higher spatial dependence range in the b horizon, probably as a result of more intensive management and erosion history of the superficial soil layer. maps for some attributes were interpolated. these had specific areas of occurrence and a wide distribution along the perimeter of the cap?o bonito district forest, allowing a future site-specific soil management.
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