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Search Results: 1 - 10 of 234339 matches for " Lúcio Flavo Lopes;Ribeiro "
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Varia??o da densidade de fluxo de seiva e do potencial hídrico foliar nas faces leste e oeste da copa de laranjeira 'Valência'
Vasconcelos, Lúcio Flavo Lopes;Ribeiro, Rafael Vasconcelos;Oliveira, Ricardo Ferraz de;Machado, Eduardo Caruso;
Revista Brasileira de Fruticultura , 2010, DOI: 10.1590/S0100-29452010005000004
Abstract: this paper aimed to study the effect of diurnal and seasonal variation of the environmental factors on the sap flow density (sfd) and leaf water potential (ψl) in the east and west side of the canopy of 'valencia' sweet orange trees under field conditions, with no irrigation system. were evaluated three plants, whose planting rows were north-south oriented. the evaluations were performed during one day in each season of the year: summer, autumn, winter and spring. the values of water potential measured at predawn ranged from -0,31 mpa, in the day 12/10/05, to -1,1 mpa, in the day 08/30/05, however there was no significant difference between the east and west sides of the canopy. at the afternoon, leaves at the west side showed smaller (p<0,05) water potential than the ones at east position, with values varying between -0,95 (12/10/05) and -1,89 mpa (08/30/05). the largest air evaporative demand that is verified at afternoon induces to a larger water deficit in the west side of the canopy independent of the time of the year and, in consequence, larger sfd in well-watered plants under conditions of days completely sunny. under water deficit conditions (low values of ψl), the west side of the plants is more sensible to that condition, showing reduction of sfd.
'Tommy Atkins' mango trees subjected to high density planting in subhumid tropical climate in northeastern Brazil
Sousa, Carlos Ant?nio Ferreira de;Cavalcanti, Maria Irisvalda Leal Gondim;Vasconcelos, Lúcio Flavo Lopes;Sousa, Humberto Umbelino de;Ribeiro, Valdenir Queiroz;Silva, José Algaci Lopes da;
Pesquisa Agropecuária Brasileira , 2012, DOI: 10.1590/S0100-204X2012000100006
Abstract: the objective of this work was to evaluate the effects of high density planting on 'tommy atkins' mango trees cultivated in subhumid warm tropical climate in northeastern brazil. treatments consisted of five spacial arrangements of plants (8x5 m, 7x4 m, 6x3 m, 5x2 m and 4x2 m), which resulted in the following plant densities: 250 (control), 357, 555, 1,000 and 1,250 plants per hectare. plant vegetative and reproductive variables, besides fruit quality parameters, were evaluated at seven and eight years after transplantation to the field. in general, high density planting caused reduction in vegetative and reproductive variables of individual mango trees, but had little influence on fruit quality. above 555 plants per hectare, a significant decrease was observed in mango tree growth. furthermore, there were decreases in the percentage of flowering, fruit yield per plant and per area. however, planting density up to 357 plants per hectare, in spite of decreasing plant growth and fruit yield per tree, increases fruit yield per area in 30% in comparison to the control.
Nitrogênio e potássio via água de irriga??o nas características de produ??o da bananeira 'Grand Naine'
Sousa, Valdemício Ferreira de;Veloso, Marcos Emanuel da Costa;Vasconcelos, Lúcio Flavo Lopes;Ribeiro, Valdenir Queiroz;Souza, Valdomiro Aurélio Barbosa de;d'Albuquerque Junior, Boanerges Siqueira;
Pesquisa Agropecuária Brasileira , 2004, DOI: 10.1590/S0100-204X2004000900005
Abstract: the objective of this work was to evaluate the effect of nitrogen and potassium, applied through irrigation water by microsprinkler, on the production characteristics of banana, cv. grand naine. the experimental design was a randomized block with four replications. the treatments consisted of 30, 180, 300, 420 and 570 kg ha-1 year-1 of n and of 55, 330, 550, 770 and 1,045 kg ha-1 year-1 of k2o and a control treatment (no fertilizers), totalizing 11 treatments, according to the plan puebla iii experimental matrix model. the following characteristics were evaluated: average fruit mass, average bunch mass, and fruit yield, referent to the first and the second production cycles. in the first and second production cycle, average fruit mass, average bunch mass and fruit yield were influenced only by the potassium. higher values of average fruit mass (253.47 g), average bunch mass (28 kg) and fruit yield (55.42 t ha-1), for the first production cycle, were obtained with the application of 938.46, 665.38 and 635.00 kg ha-1 of k2o, respectively. in the second cycle, higher values in relation average fruit mass (174.22 g), average bunch mass (32.04 kg) and yield (60.89 t ha-1) were gathered with the application of 725.50, 907.50 and 933.33 kg ha-1 of k2o, respectively. there was no response of evaluated characteristics to nitrogen.
Distribui??o de raízes de laranja "Pêra" sob sequeiro e irriga??o por microaspers?o em solo arenoso
Coelho, Eugênio Ferreira;Oliveira, Francisco das Chagas;Araújo, Eugênio Celso Emérito;Vasconcelos, Lúcio Flavo Lopes;
Pesquisa Agropecuária Brasileira , 2002, DOI: 10.1590/S0100-204X2002000500005
Abstract: the objective of this work was to evaluate root distribution of orange cv. pêra under non-irrigated and under microsprinkler irrigated conditions in a coastal plain sandy soil. root samples were collected by monolith method from trenches, which were dug aside, the plant trunk at longitudinal and orthogonal directions to plant rows. after separation from soil, roots were scanned and digitized in a pc computer. root length and diameter were determined using rootedge software that allowed mapping root distribution on sampled soil profiles. results showed that root system of microsprinkler irrigated trees occupied higher volume in the soil compared to the one under non-irrigated conditions. higher amounts of fine roots were found in the profiles of microsprinkler irrigated trees that indicated higher root activity in those profiles compared to the non-irrigated ones. results also showed that the most suitable locations for soil water sensor placement in orange orchards using microsprinkler irrigation are between 0 and 2.5 m of radial distance from the trunk, at depths between 0 and 1.0 m.
Métodos para acelerar a germina??o de sementes de Bacuri (Platonia insignis Mart.)
OLIVEIRA, FRANCISCO DAS CHAGAS;ARAúJO, EUGêNIO CELSO EMéRITO;VASCONCELOS, LúCIO FLAVO LOPES;SOARES, éDSON BASíLIO;
Revista Brasileira de Fruticultura , 2002, DOI: 10.1590/S0100-29452002000100033
Abstract: the objective of this study was to evaluate methods to accelerate the germination of bacuri seeds (platonia insignis mart.). the experiment was conducted in the laboratory of plant physiology and in the greenhouse of embrapa meio-norte (teresina-pi), in a randomized block design, constituted by ten treatments and four repetitions, being the experimental unit constituted by ten seeds. the following treatments were tested: control (t1); removal of the seed tegument (t2); removal of the fundamental meristem, through cuts in perpendicular plans to the plan dorsal/ventral, in the two sides of the seed, without reaching the meristem of medulla (t3); the same as t3 adding removal of the fundamental meristem through cuts in parallel plans to the dorsal/ventral plan, in dorsal region, without reaching the medulla meristem (t4); the same as t3 maintained in water for 40oc for 20 minutes (t5); the same as t4 maintained in water for 40oc for 20 minutes (t6); the same as t3 maintained in etanol 80% during 5 minutes (t7); the same as t4 maintained in alcohol 80% during 5 minutes (t8); the same as t3 maintained in acetone 80% during 5 minutes (t9); and the same as t4 maintained in acetone 80% during 5 minutes (t10). were evaluated: the percentage of emergence of the primary root at 14, 21, 28, and 35 days after sowing and emergence velocity index of the primary root ive on the 35th day after sowing. the seeds submitted to t2, t3, t4, t5 and t6 presented 72,5%, 65,0%, 72,5%, 52,5% and 67,5%, of emergence respectively, on the 14th day and were superior (p <0,05) to the other treatments. all the treatments were superior (p <0,05) to the control (35,0%) on the 21st day and there was not significant difference among the treatments after 28 and 35 days. treatments t2, t3, t4, t5 and t6 presented the ive values of 0,59; 0,57; 0,61; 0,54 and 0,59, respectively, superior (p <0,05) to the other treatments, which didn't differ of the control (0,36). from now on it was recommended to accelera
Distribui o de raízes de laranja "Pêra" sob sequeiro e irriga o por microaspers o em solo arenoso
Coelho Eugênio Ferreira,Oliveira Francisco das Chagas,Araújo Eugênio Celso Emérito,Vasconcelos Lúcio Flavo Lopes
Pesquisa Agropecuária Brasileira , 2002,
Abstract: O trabalho teve por objetivo avaliar a distribui o de raízes de laranja "Pêra" sob condi es n o-irrigadas e irrigadas por microaspers o em solo arenoso de tabuleiro costeiro. As raízes foram extraídas em trincheiras, a partir do tronco, nas dire es longitudinal e ortogonal à fileira de plantas, pelo método do monolito. Uma vez separadas, foram digitalizadas com uso de computador e scanner, para obter, com o uso do software Rootedge, os comprimentos e diametros dos segmentos de raízes de todas as amostras, que foram mapeados nos perfis amostrados. O sistema radicular sob irriga o por microaspers o apresentou maior expans o, tanto em profundidade como em distancia radial do tronco, do que o sistema radicular sob condi es n o-irrigadas. Houve maior porcentagem de raízes finas nos perfis de solo sob microaspers o, em rela o à condi o n o-irrigada, indicando a possibilidade de maior atividade do sistema radicular nesse sistema de irriga o. As posi es mais adequadas para instala o de sensores de água do solo para a cultura da laranja sob microaspers o est o entre 0 e 2,5 m de distancia radial a partir do tronco, em profundidades entre 0 e 1,0 m.
DISTRIBUI O DO SISTEMA RADICULAR DA MANGUEIRA SOB IRRIGA O LOCALIZADA EM SOLO ARENOSO DE TABULEIROS COSTEIROS
COELHO EUGêNIO FERREIRA,OLIVEIRA FRANCISCO DAS CHAGAS,ARAúJO EUGêNIO CELSO EMéRITO,VASCONCELOS LúCIO FLAVO LOPES
Revista Brasileira de Fruticultura , 2001,
Abstract: O trabalho teve por objetivo avaliar a distribui o de raízes de mangueiras sob irriga o localizada (gotejamento e microaspers o) em solo arenoso de Tabuleiros Costeiros. Foram feitas trincheiras a partir do tronco nas dire es longitudinal e ortogonal à fileira de plantas e, pelo método do monólito, as raízes puderam ser extraídas do solo e, uma vez separadas, foram digitalizadas com uso de computador e "scanner". Com uso do software Rootedge, foi possível a obten o dos comprimentos e diametros dos segmentos de raízes de todas as amostras, permitindo um mapeamento desses parametros nos perfis amostrados. Os resultados mostraram distribui es de raízes assimétricas em rela o ao tronco para os dois sistemas de irriga o localizada com possibilidade de maior atividade do sistema radicular para as plantas sob gotejamento (oito gotejadores de 4L.h-1 por planta) em rela o às plantas sob microaspers o (um emissor por planta de vaz o 70L.h-1). Os resultados enfatizaram o uso da fertirriga o como a maneira mais adequada de fertiliza o em irriga o localizada e permitiram definir regi es do sistema radicular para instala o adequada de sensores de água do solo.
A cultura da manga sob diferentes regimes de profundidades do len ol freático em condi es subúmidas
COELHO EUGêNIO FERREIRA,OLIVEIRA FRANCISCO DAS CHAGAS,NASCIMENTO CARLOS JOSé ARAúJO DO,VASCONCELOS LúCIO FLAVO LOPES
Revista Brasileira de Fruticultura , 2002,
Abstract: O conhecimento dos critérios agron micos de drenagem para a cultura da manga é fundamental na elabora o de sistemas de drenagem para áreas com essa cultura e permite antecipar o seu comportamento sob diferentes níveis de drenagem do solo . O trabalho teve por objetivo avaliar as condi es de aera o e umidade do perfil de um solo arenoso (areia franca) sob diferentes regimes de profundidades do len ol freático, para determina o de critérios de drenagem para a cultura da manga, cultivar Keitt. O experimento seguiu um delineamento inteiramente casualizado, com quatro tratamentos (regimes de profundidades do len ol freático às distancias do dreno de 3,5 m; 10,5 m; 17,5 m e sem presen a de len ol freático) e cinco repeti es. As profundidades do len ol freático e os teores de água no perfil do solo em cada tratamento foram monitorados durante os períodos chuvosos, em três anos consecutivos (1997-1999). N o houve diferen a significativa entre as produtividades da cultura nos tratamentos. As diferen as nas profundidades do len ol freático, nos tratamentos com drenagem, n o foram suficientes para diferenciar o estado da água no solo nesses tratamentos. O len ol freático, na profundidade média de 1,0 m, durante os cinco ou seis meses de período chuvoso, com recargas temporárias atingindo profundidades próximas da superfície do solo, seguidas de rebaixamento imediato do len ol freático, n o foi suficiente para afetar o desenvolvimento e a produtividade da manga.
Métodos para acelerar a germina o de sementes de Bacuri (Platonia insignis Mart.)
OLIVEIRA FRANCISCO DAS CHAGAS,ARAúJO EUGêNIO CELSO EMéRITO,VASCONCELOS LúCIO FLAVO LOPES,SOARES éDSON BASíLIO
Revista Brasileira de Fruticultura , 2002,
Abstract: Este trabalho teve o objetivo de avaliar métodos para acelerar a germina o de sementes de bacuri (Platonia insignis Mart.), e foi conduzido no laboratório de Fisiologia Vegetal e na Camara de Nebuliza o da Embrapa Meio-Norte, Teresina-PI. O delineamento utilizado foi o de blocos ao acaso, constituído por dez tratamentos e quatro repeti es, sendo a unidade experimental constituída por dez sementes. Foram testados os seguintes tratamentos: testemunha (T1); remo o do tegumento da semente (T2); remo o do meristema fundamental cortical por meio de cortes em planos perpendiculares ao plano dorsal/ventral, nos dois lados da semente, sem atingir o meristema fundamental medular (T3); T3 mais a remo o do meristema fundamental cortical por meio de cortes em planos paralelos ao plano dorsal/ventral, na regi o dorsal, sem atingir o meristema fundamental medular (T4); T3 e T4 mantidos em água a 40oC por vinte minutos (T5 e T6); T3 e T4 mantidos em etanol 80% por cinco minutos (T7 e T8); T3 e T4 mantidos em acetona 80% por cinco minutos (T9 e T10). As variáveis estudadas foram a percentagem de emergência da radícula aos 14; 21; 28 e 35 dias após a semeadura e o índice de velocidade de emergência da radícula (IVE), no 35o dia após a semeadura. As sementes submetidas aos tratamentos T2, T3, T4, T5 e T6 apresentaram 72,5%, 65,0%, 72,5%, 52,5% e 67,5% de emergência, respectivamente, aos 14 dias, sendo superiores (p<0,05) aos demais tratamentos. Todos os tratamentos foram superiores (p<0,05) à testemunha aos 21 dias (35,0%) e n o houve diferen a significativa entre os tratamentos com 28 e 35 dias. Os tratamentos T2, T3, T4, T5 e T6 apresentaram IVE de 0,59; 0,57; 0,61; 0,54 e 0,59, respectivamente, superando (p<0,05) os demais tratamentos, os quais n o diferiram da testemunha (0,36). Diante disto, recomenda-se, para acelerar a emergência de radículas, efetuar dois cortes laterais ao plano dorsal/ventral da semente, por se tratar de um método simples e mais econ mico, o que poderá possibilitar redu o no tempo e nos custos de forma o de mudas.
VARIABILIDADE DE CARACTERíSTICAS FíSICAS E QUíMICAS DE FRUTOS DE GERMOPLASMA DE BACURI DA REGI?O MEIO-NORTE DO BRASIL
SOUZA, VALDOMIRO AURéLIO BARBOSA DE;ARAúJO, EUGêNIO CELSO EMéRITO;VASCONCELOS, LúCIO FLAVO LOPES;LIMA, PAULO SARMANHO DA COSTA;
Revista Brasileira de Fruticultura , 2001, DOI: 10.1590/S0100-29452001000300047
Abstract: the objective of this study was to evaluate physical and chemical characteristics of bacury fruits collected from selected plants of occurrence in the mid-north region. the following fruit characteristics were analysed: length e width; average weight; average polp weight; length to width ratio; peel thickness; percentage of peel; percentage of polp; percentage of seed; number of seeds/fruit; number of partenocarpic section/fruit; total soluble solids content; titratable acidity, and total soluble solids content to titratable acidity ratio. fruits were collected from 26 selected plants mapped in nine locations in piauí and maranh?o states. physical and chemical fruit characterizatics were evaluated at the plant physiology laboratory of embrapa meio-norte, in teresina, pi, brazil. fruit samples used varied in size according to the availability of fruit production from each selected plant. the variance analysis indicated significant effects for collect local and selected plants for all characteristics analysed, except for the number of partenocarpic section/fruit for which did not have local effect. average fruit weight and average polp weight; average fruit weight and fruit width; average polp weight and fruit width; fruit length and peel thickness; fruit length and percentage of peel; peel thickness and percentage of peel; and average fruit weight and fruit length showed high values for phenotypic correlations (rp 3 0.85). repeatability estimates varied from 0.50 (% polp) to 0.98 (att) indicated large amount of variation for the characteristics analysed compared to permanent environment.
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