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Search Results: 1 - 10 of 7210 matches for " Barroso Deborah Guerra "
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Cultivo de milho no sistema de aléias com leguminosas perenes
Queiroz, Luciano Rodrigues;Coelho, Fábio Cunha;Barroso, Deborah Guerra;
Ciência e Agrotecnologia , 2007, DOI: 10.1590/S1413-70542007000500005
Abstract: the objective of this study was to evaluate the effects of perennials legumes, in n, p and k foliar concentration and maize productivity in alley cropping system, without phosphorus fertilization. field experiments were carried out for two cycles, with legumes intercropping maize (uenf 506-8) in field research ccta/uenf in campos dos goytacazes - rj - brazil. the treatments consisted of alley cropping system with the species: albizia lebbeck (l.) benth., peltophorum dubium (spreng.) taub., leucaena leucocephala (lam.) de wit., cajanus cajan (l.) millsp., sesbania virgata (cav.) pers., mimosa caesalpiniaefolia benth., gliricidia sepium (jacq.) pers. and two control treatments: sole maize with or without fertilizer npk. eight months after the plantation, the legumes species were pruned and incorporated in soil. maize was sown interows legumes, in rows spaced 80 cm. new prune carried on sixty days after the first cut. in the second cycle, the crop handlings were similar to the first cycle. the experimental design consisted of randomized blocks with four replicates. in the alley cropping with cajanus cajan the maize show the larger n foliar concentration, in first cycle. in the second cycle, maize+gliricidia sepium, maize+cajanus cajan and sole maize with npk produced more grain than others treatments.
Propaga??o de ara?azeiro e goiabeira via miniestaquia de material juvenil
Altoé, Jalille Amim;Marinho, Cláudia Sales;Terra, Maria Isabela da Costa;Barroso, Deborah Guerra;
Bragantia , 2011, DOI: 10.1590/S0006-87052011000200009
Abstract: this study was carried out to evaluate the viability of the minicutting technique on rooting of juvenile material of cattley guava (psidium guineense and psidium cattleyanum) and guava (psidium guajava), and seedling growth after transplanting and production of the ministumps under successive harvests. three experiments were carried out in a randomized block design using three species and four replicates. sixty-two days after cutting establishment, p. guineense, p. cattleyanum and p. guajava showed rooting percentages of 96%, 92% and 100%, respectively. p. guajava showed a minimum stem diameter of 8 mm at 110 days after transplanting and p. guineense and p. cattleyanum showed stem diameter of 7 mm after 140 days of transplanting. minicutting production increased over successive harvests of sprouts. based on these results, it is concluded that the minicutting technique is viable for multiplying cattley guava and guava.
Genetic diversity in Australian Cedar genotypes selected by mixed models
Tavares, Rulfe;Viana, Alexandre Pio;Barroso, Deborah Guerra;Amaral Júnior, Antonio Teixeira do;
Ciência e Agrotecnologia , 2012, DOI: 10.1590/S1413-70542012000200005
Abstract: the increasing demand for raw material for multiple uses of forest products and by-products has attracted the interest for fast growing species, such as the australian cedar (toona ciliata), which presents high productive and economic potential. the present work aimed at estimating genetic diversity by dna markers and morphological traits supported for the mixed models. the following traits were measured and genotypes were sampled randomly in different areas: diameter at breast height, height, cylindrical volume, diameter, distance between nodes and crown diameter. twelve rapd primers were used and generated a total of 91 marks, 82 of which were polymorphic. the high percentage of polymorphic markers, 90.10%, demonstrated that discrimination in this species is efficient, but it yet little studied, for this case we can find the extent of the genetic basis for the application of technical improvement. the assessment of genetic diversity by the upgma method using the binary and morphological data provided the expression of genetic dissimilarities among the accessions evaluated, optimizing the perception of this divergence. the use of mixed models was efficient to assess combined genetic diversity to optimize the selection of genotypes with divergent genetic values for diameter at breast height.
Produ??o e desenvolvimento radicular de plantas de café 'Conilon' propagadas por sementes e por estacas
Partelli, Fábio Luiz;Vieira, Henrique Duarte;Santiago, Anderson Ribeiro;Barroso, Deborah Guerra;
Pesquisa Agropecuária Brasileira , 2006, DOI: 10.1590/S0100-204X2006000600008
Abstract: the objective of this work was to evaluate the production and root and shoot development of plants of 'conilon' coffee, grown from seeds and branches, in vila valério, es, brazil. the experiment was performed in randomized complete block design, with two treatments (seedlings originated from seeds and branches), and 12 replicates with five plants per plot. shoot growth evaluation was performed seven months after planting. six pruning of the orthotropic branches and five yields were evaluated. the evaluation of the root system was done 52 months after planting in four depths (0-10, 10-20, 20-40 and 40-60 cm). diameter, length and superficial area of roots were quantified. plants grown from cuttings produced more plagiotropic branches, during the first seven months, and less orthotropic branches throughout the experimental period. there were no differences either in length or superficial area of roots from plants propagated by seeds or cuttings. there was a greater concentration of fine roots in the superficial layers of the soil. the productivity of plants grown from cuttings is higher than that observed in plants grown from seeds.
Fixa??o biológica e transferência de nitrogênio por leguminosas em pomar organico de mangueira e gravioleira
Paulino, Gleicia Miranda;Alves, Bruno José Rodrigues;Barroso, Deborah Guerra;Urquiaga, Segundo;Espindola, José Antonio Azevedo;
Pesquisa Agropecuária Brasileira , 2009, DOI: 10.1590/S0100-204X2009001200006
Abstract: the objective of this work was to evaluate the biological nitrogen fixation (bnf) and the n transfer derived from bnf of the legume species - gliricidia sepium (gliricidia), crotalaria juncea (sunnhemp) and cajanus cajan (pigeon pea) - for an intercropped organic orchard with mango and soursop, through the 15n natural abundance method. the following intercropping systems were evaluated: mango and soursop with gliricidia; mango and soursop with sunnhemp; mango and soursop with pigeon pea; and mango and soursop as control. gliricidia showed the highest bnf potential (80%) , followed by sunnhemp (64.5%) and pigeon pea (45%). after two sunnhemp prunes, 149.5 kg ha-1 of n per year were supplied, with 96.5 kg derived from bnf. after three annual prunes, gliricidia supplied 56.4 and 80.3 kg ha-1 of n per year, with 45 and 64 kg derived from bnf, in two consecutive years. the quantity of n supplied to the system was higher than the mango and soursop requirements. variations in the natural abundance of 15n were found only in soursop leaves. gliricidia and sunnhemp were prominent in n transfer, with approximately 22.5 and 40% respectively. green manuring using gliricidia permits fractioning of the n supply, which is an advantage in n obtention by the fruit trees.
Growth of bare root Pinus taeda, L. seedlings cultivated under five densities in nursery
Carneiro, José Geraldo de Araújo;Barroso, Deborah Guerra;Soares, Luis Maurício da Silva;
Scientia Agricola , 2007, DOI: 10.1590/S0103-90162007000100004
Abstract: seedlings compete for nutrients, water and light. the available area for each seedling affects their behavior related to requirements for these resources. this experiment evaluated the influence of five plant densities on the growth of bare root pinus taeda, l. seedlings in a nursery after outplanting. the analyzed characteristics were: height (h), root collar diameter (d), h/d ratio, and dry matter weight. higher densities stimulated h growth and the lowest densities increased d average and dry matter weight and lowered the h/d ratio. seedlings were distributed by h, d and h/d classes. higher densities had a larger number of seedlings in larger h classes. larger numbers of seedlings with larger d and lower h/d ratios were found in lower densities. ten months after outplanting the seedlings grown in lower densities had higher survival percentages and growth. some saplings of standardized heights were uprooted with the objective of studying their root systems. the lowest densities stimulated higher numbers of first and second order roots as well as fresh and dry matter weights of thin roots with mycorrhizae presence. in both parts of the experiment, the density of 278 seedlings m-2 yielded equivalent averages as compared to the lowest densities.
Crescimento de mudas de Anadenanthera macrocarpa (Benth) Brenan (angico -vermelho) em substrato fertilizado e inoculado com rizóbio
Chaves, Luciana de Lima Brand?o;Carneiro, José Geraldo de Araújo;Barroso, Deborah Guerra;
Revista árvore , 2006, DOI: 10.1590/S0100-67622006000600006
Abstract: seedlings of anadenanthera macrocarpa (red angico) were grown in 18 x 15 cm black polyethylene bags. the growth medium was sieved and mixed with residues of sugarcane bagasse + decomposed filter cake (3:2, v:v) the objective was the evaluation of the fertilization and inoculation with rhizobium on the quality of the seedlings. two experiments were carried out. in each one, separately, ammonium sulfate and ammonium nitrate were added, in three different doses. in both experiments, a specific rhizobium species was also inoculated together with the seeds. a completely randomized design with three replicates was used. at 180 days after sowing, the seedlings were evaluated for height (h), root collar diameter (d), h/d ratio, shoot and root dry matter weights, leaf area and root regeneration potential. it was concluded that inoculation with rhizobium was sufficient to stimulate growth of "red-angico" seedlings in this substrate. the tested fertilizers were not efficient for the stimulation of seedling growth.
Avalia??o da produtividade de fitomassa e acúmulo de N, P e K em leguminosas arbóreas no sistema de aléias, em Campos dos Goytacazes, RJ
Queiroz, Luciano Rodrigues;Coelho, Fábio Cunha;Barroso, Deborah Guerra;Queiroz, Valéria Aparecida Vieira;
Revista árvore , 2007, DOI: 10.1590/S0100-67622007000300003
Abstract: the objective of this study was to evaluate the shoot phytomass and shrub legumes n, p and k accumulation in agroforestry system (alley cropping system) and study the effect of p fertilization. two field experiments were carried out - without and with p application - for two years: 2004 and 2005, using shrub legumes in campos dos goytacazes - rj - brazil. the treatments consisted of alley cropping system with the species: albizia lebbeck (l.) benth., peltophorum dubium (spreng.) taub., leucaena leucocephala (lam.) r. de wit., cajanus cajan (l.) millsp., sesbania virgata (cav.) pers., mimosa caesalpiniaefolia benth.e gliricidia sepium (jacq) pers.. eight months after the plantation, the legumes were pruned at 1.5-m height, and the shoot phytomass was weighed. stems with diameter higher than 1.5 cm were not considered in the weighed phytomass. the dry matter obtained in the pruning was expressed as kg ha -1 year -1. samples from the pruning were used to determine the dry phytomass and n, p and k contents. new pruning was carried out eighty days after the first cut. in the first crop year, cajanus cajan (l.) millsp. produced the highest dry phytomass and accumulated the highest amounts of n, p and k; while in the second year, in the experiment with p fertilization, cajanus cajan (l.) millsp., peltophorum dubium (spreng.) stend. and leucaena leucocephala (lam.) de wit. produced the highest dry phytomass, and leucaena accumulated the highest amount of k in shoot phytomass. phytomass productivity was higher when some legumes received phosphorus application.
Substrato de cavas de extra o de argila enriquecido com subprodutos agroindustriais e urbanos para produ o de mudas de sesbania
Coutinho Marcos Pellegrini,Carneiro José Geraldo de Araújo,Barroso Deborah Guerra,Rodrigues Luciana Aparecida
Revista árvore , 2006,
Abstract: O trabalho teve como objetivo avaliar o crescimento, em casa de vegeta o, de mudas de Sesbania virgata (Cav.) Pers., produzidas em substrato de cavas de extra o de argila e adubadas com subprodutos organicos. As mudas foram cultivadas em vasos de 5 L, adicionando-se ao substrato "ferkal", composto de lixo urbano e torta de filtro, em diferentes doses (40, 80, 120 e 160 g dm-3), e comparadas com o controle (sem aduba o). O experimento foi conduzido em delineamento inteiramente casualizado, com cinco repeti es, constituídas de uma planta. Aos quatro meses após a semeadura, foram feitas avalia es de altura, diametro do colo, matéria seca da parte aérea e de raízes laterais. Também foram determinados comprimento, área superficial das raízes laterais, coloniza o micorrízica e teores foliares de N, P e K. O substrato sem aduba o originou mudas com maiores dimens es de altura, diametro do colo e matéria seca da parte aérea. Contudo, n o houve diferen as com rela o à matéria seca, comprimento e área superficial das raízes e coloniza o micorrízica, entre os tratamentos. Constatou-se tendência de crescimento dos valores das características morfológicas da parte aérea das mudas, à medida que as doses foram aumentadas. Os teores foliares de N, P e K das mudas que n o receberam adi o dos subprodutos foram menores em rela o às mudas adubadas. Os resultados evidenciaram que o uso de sesbania para revegeta o de cavas de extra o de argila n o implica gastos adicionais com fertilizantes organicos. Entretanto, a adi o dos subprodutos estudados pode favorecer a forma o de serapilheira mais rica em nutrientes.
Sistema de blocos prensados e doses de adubo de libera??o lenta na forma??o de porta-enxerto cítrico
Serrano, Luiz Augusto Lopes;Marinho, Cláudia Sales;Barroso, Deborah Guerra;Carvalho, Almy Júnior Cordeiro de;
Ciência Rural , 2006, DOI: 10.1590/S0103-84782006000200013
Abstract: due to the restriction that the stiff plastic tubes impose to the lateral growth of the root system, the use of pressed organic materials has been proposed for the production of forests species seedlings. the research was carried out with the objectives of evaluating the production of rootstock 'rangpur' lime tree in pressed blocks until the transplant, and the effect of those systems were evaluated and doses of slow release fertilizer on the growth of that rootstock until the grafting point. three production systems were evaluated: in stiff plastic tubes filled up with commercial substrate composed by pinus bark; in stiff plastic tubes filled up with substrate composed by sugarcane bagasse and industrial sugarcane plant residues, (3:2;v:v); and production in "pressed blocks" constituted by the press of the substrate used in the system 2. from transplant at the grafting point, five doses of osmocote? (npk 14-14-14) were used: 5, 10, 15, 20 e 25g plant-1. compared to the seedlings grown in tubes, seedlings coming of the system of pressed blocks reached the transplant and the grafting point more quickly. in the grafting point they resulted in rootstocks with larger stem diameter, larger root and aerial part dry matter. the system used in the production of the rootstock also interfered in the answer of the plants to the employed manuring.
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