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Search Results: 1 - 10 of 66405 matches for " Ant?nio Marciano da;Rocha "
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Avalia??o técnica de um aspersor canh?o do tipo turbina
César, Júlio H. Fernandes;Silva, Antnio Marciano da;Rocha, Felizardo Adenilson;Mello, Carlos Rogério de;
Ciência e Agrotecnologia , 2004, DOI: 10.1590/S1413-70542004000400029
Abstract: this work intended to evaluate the technical performance of a gun sprinkler of the type turbine model "mercury" manufactured by società hidromecanica emiliana (sime) in italy and imported by the brazilian company metal lavras ltda. the study was developed with three nozzles (16, 20 and 22 mm), with service pressures of 250, 300, 350, 400, 450 and 500 kpa by the radial method test, with the purpose of verifying the influence of these parameters on distribution uniformity, application intensity, medium diameter of drops, reach radius and rotation uniformity. tables with values of average precipitation intensity, recommended spacing and values of uniformity coefficient were created, overcoming a deficiency demonstrated by manufacturer's catalog. it was verified that the medium diameter of drops increased with the decrease of the service pressure, and its behavior did not adapt to the classic model of gradual increase of the medium diameter of drops because several diameters were verified along of the wet radius. the potential equation was adjusted to the data of discharge versus pressure, with the nozzle of 16 mm being the most susceptible to the variations of service pressure. the water distribution profile followed the type "doughnut" and rectangular. the data of rotation uniformity demonstrated the efficiency of the rotation system of the turbine type. it was recommended the use of the tables produced, in substitution to the manufacturer's catalog.
Estudo petrográfico e metalográfico dos meteoritos Bocaiúva e Jo?o Pinheiro aliado à técnica de MEV/EDS
Pucheta, Flavia Noelia;Zucolotto, Maria Elizabeth;Marciano, Vitória Régia Péres da Rocha Oliveiros;Ferreira, César Mendon?a;Cassino, Flávio Sandro Lays;Gandini, Antnio Luciano;
Rem: Revista Escola de Minas , 2011, DOI: 10.1590/S0370-44672011000200004
Abstract: brazil has 58 cataloged meteorites for scientific studies; a low number compared to countries in europe and the united states. the samples studied belong to a collection of 17 meteorites from the mineralogy museum professor djalma guimar?es - mmpdg in belo horizonte, minas gerais. ten of those meteorites were found in brazil; among them are the bocaiúva and jo?o pinheiro meteorites. the bocaiúva meteorite, the third heaviest (64kg), was found around 1947 in the town of bocaiúva, located 384km from belo horizonte, in the state of minas gerais. besides the bocaiúva meteorite, there is also, in the mmpdg, another fragment cataloged as "bocaiúva meteorite", which is actually a fragment from a different meteoritic body, called jo?o pinheiro, yet to be cataloged. the mineralogical differences, especially regarding the silicate portions of the bocaiúva, as well as fluid and melted inclusions, leave no doubt that they belong to different meteorites. minerals such as kamacite, taenita, troilite, schreibersita and graphite are found in the jo?o pinheiro meteorite, while in bocaiúva are present forsterite, kamacite, taenita, troilite, schreibersite, pentlandita, magnetite, chromite, pigeonite, diopside, enstatite, plagioclase, apatite, calcite and goethite.
O efeito da época de irriga??o e de parcelamentos de aduba??o sobre a produtividade do cafeeiro em três safras consecutivas
Coelho, Gilberto;Silva, Antnio Marciano da;
Ciência e Agrotecnologia , 2005, DOI: 10.1590/S1413-70542005000200018
Abstract: the positive effects of irrigation on coffee crop productivity are reported in several scientific works. however, it is necessary to investigate the irrigation effect on coffee plant behavior, in consecutive harvests. therefore, the present study purposes to evaluate the irrigation seasons and splitting fertilizer effects on coffee plant biennial productivity cycle. an experiment was carried out in split plots, testing different fertilizer numbers applications: plot 1 (p1) has received 12 manual fertilizers applications; plots 2, 3 and 4 (p2, p3 and p4) have received, respectively, 12, 24 and 36 fertilizers applications by irrigation water. in subplots, 3 irrigations seasons were tested, working with 3 replications (blocks): 01/jun to 30/set (subplot a), 15/jul to 30/set (subplot b), 01/set to 30/set (subplot c) and a treatment for testifying without irrigation (subplot d). cloth and ground coffee productivity and total productivity, in kg ha-1, were evaluated by anova and mean tests. significant effects of fertilizer applications, on cloth coffee productivity, were verified by anova, with p1 split plot has provided the best productivity (3120 kg ha-1). irrigation seasons have showed significant effects on three parameters studied. significant statistical interaction was verified only among crops and irrigation seasons. those results demonstrate that irrigation does not have eliminated the coffee plant biennial productivity cycle. it is recommended to start irrigation from 01/jun, because this treatment has produced better results than others, in two of the three crops studied, besides the smallest coefficient of variation concerning productivity.
CONTRIBUI O DE SAFRINHAS EM SUCESS O à CULTURA DA SOJA EM PLANTIO DIRETO SOBRE A RESISTêNCIA à PENETRA O DO SOLO EFFECTS OF DOUBLE CROPPING WITH SOYBEAN ON SOIL PENETRATION RESISTANCE UNDER NO-TILLAGE
Antnio Pasqualetto,Liovando Marciano da Costa
Pesquisa Agropecuária Tropical , 2007, DOI: 10.5216/pat.v31i1.2527
Abstract: Objetivou-se avaliar a resistência à penetra o do solo em área com sete sucess es de culturas, envolvendo as seguintes culturas de safrinhas: milho, soja, milheto, girassol, sorgo, aveia e nabo forrageiro, com a cultura da soja, no sistema plantio direto, conduzidas durante três anos (1994-1996), na área experimental da Funda o de Ensino Superior de Rio Verde, no município de Rio Verde, Goiás. No último ano, na entressafra de culturas de safrinha e cultura de ver o mediu-se a resistência à penetra o no solo em diferentes camadas entre 0 e 30 cm de profundidade, utilizando-se penetrógrafo. Observou-se intera o significativa entre sucess es de culturas e profundidades no perfil do solos para a característica avaliada. As sucess es que incluem milheto e sorgo reduzem a resistência à penetra o do solo a 15 cm de profundidade, comparadas ao girassol. Nesta profundidade o solo ofereceu tendência à maior resistência à penetra o em todos os tratamentos avaliados. PALAVRAS-CHAVE: Física do solo; solos de cerrado; penetrometria. The objective of this study was objectified to evaluate the resistance to the penetration of the soil in area as seven successions of cultures, involving the double cropping cultures: corn, soybean, pearl millet, sunflower, sorghum, oat and turnip fodder, with the culture of the soybean, in no-tillage, driven for three years (1994-1996), in the Foundation experimental area of Higher education de Rio Verde, in the municipal district of Rio Verde, Goiás. In the last year, in the between cultures of double cropping it measured the resistance to the penetration in the soil in different layers between 0 and 30 depth cm, using penetrographer. Significant interaction was observed between successions of cultures and depths in the profile of the soils for the appraised characteristic. The successions that include pearl millet and sorghum reduce the penetration of the soil to 15 cm of depth bought to the sunflower. In this depth the soil offered tendency the largest resistance to the penetration in all the appraised treatments. KEY-WORDS: Physics of the soil; soil in the cerrado; metropenetrography.
INFLUêNCIA DE SUCESS O DE CULTURAS SOBRE CARACTERíSTICAS AGRON MICAS DO MILHO (Zea mays L.) EM PLANTIO DIRETO INFLUENCE OF CROP SEQUENCES ON AGRONOMIC CHARACTERISTICS OF CORN (Zea mays L.) UNDER NO-TILLAGE
Antnio Pasqualetto,Liovando Marciano da Costa
Pesquisa Agropecuária Tropical , 2007, DOI: 10.5216/pat.v31i1.2530
Abstract: Avaliaram-se características agron micas na cultura do milho em seis sucess es de culturas (milho-milho, soja-milho,girassol-milho, milheto-milho, sorgo-milho e guandu milho) em plantio direto, durante três anos, em Rio Verde, Goiás. Observou-se significancia, pelo teste F, para altura de planta, peso de 100 gr os e umidade dos gr os na colheita. Guandu, soja, girassol e milheto proporcionaram maior altura da planta de milho. N o foram observadas diferen as estatísticas entre as sucess es para produtividades de gr os e demais características avaliadas. PALAVRAS-CHAVE: Sucess o de culturas; milho; características agron micas. Evoluated agronomic characteristics of corn in six crop sequences (corn-corn, soybean-corn, sunflower-corn, pearl milletcorn, sorghum-corn and pigeon pea-corn) under no-tillage for three years, in Rio Verde, Goiás State. Significance was observed by the test F for plant height, 100 grain weight and grain moisture. Pigeon pea, soybean, sunflower and pearl millet, resulted in taller corn plants. No statistical differences were found between crop sequences for corn grain yield and other characteristics. KEY-WORDS: Crop sequences; corn; agronomic characteristics.
INFLUêNCIA DE CULTURAS DE SAFRINHAS EM SUCESS O à CULTURA DO MILHO (Zea mays L.) NO SISTEMA PLANTIO DIRETO SOBRE A RESISTêNCIA à PENETRA O DO SOLO INFLUENCE OF DOUBLE CROPPING IN SUCESSION TO THE CULTURE OF THE CORN (Zea mays L.) IN THE NO TILLAGE ON THE RESISTANCE TO THE PENETRATION OF THE SOIL
Antnio Pasqualetto,Liovando Marciano da Costa,Antnio Alberto da Silva,Carlos Sigueyuki Sediyama
Pesquisa Agropecuária Tropical , 2007, DOI: 10.5216/pat.v29i2.2837
Abstract: O objetivo desse trabalho foi avaliar a resistência à penetra o do solo em área com seis sucess es de culturas, envolvendo safrinhas com a cultura do milho, no sistema plantio direto, conduzidas durante três anos, em Rio Verde, Goiás. O experimento foi conduzido no ano de 1995. As culturas de safrinha utilizadas foram; milho (Zea mays L.), soja (Glycine max L.), girassol (Helianthus annus L.), milheto (Pennisetum typhoides), sorgo (Sorghum vulgare Pers) e guandu (Cajanus indicus Spreng). A sucess o de cada safrinha com a cultura do milho constituiu os tratamentos, num total de seis, que compunham as parcelas, dispostos em glebas independentes, enquanto as profundidades no solo de 7,5, 15,0, 22,5 e 30,0cm constituíram as subparcelas. Observou-se uma intera o significativa entre sucess es de culturas e profundidades no perfil do solos para a característica de resistência à penetra o da haste do penetrógrafo. N o foram observadas diferen as estatísticas entre as sucess es. Quanto à profundidade aos 30,0 cm, houve uma redu o significativa da resistência à penetra o do solo, sendo mais evidente quando sorgo e milheto foram cultivados como culturas de safrinha. PALAVRAS-CHAVE: Física do solo; solos do cerrado; penetrometria. The objective of this paper is to evaluate the resistance to soil penetration in an area with six successions of cultures, involving the double cropping cultures and corn, in no-tillage management, carried out for three years in Rio Verde, Goiás. The experiment was conducted in 1995. The used double croppings were: corn (Zea mays L.), soy (Glycine max L.), sunflower (Helianthus annus L.), pearl millet (Pennisetum typhoides), sorghum (Sorghum vulgare Pers) and guandu (Cajanus indicus Spreng). The succession of each double cropping with the culture of corn constituted the treatments, in a total of six, which composed the portions, disposed in independent gleeful, while the depths in the soil of 7,5, 15,0, 22,5 and 30,0 cm constituted the sub-portions. A significant interaction was observed between successions of cultures and depths in the profile of the soils. Statistical differences were not observed. As far as depth to 30 cm is concerned, there was a significant reduction of the resistance to the penetration of soil, even more evident when sorghum and pearl millet were cultivated as double cropping cultures. KEY-WORDS: Physics of the soil; soils of cerrado; peng.
OCORRêNCIA DE PLANTAS DANINHAS NA CULTURA DO MILHO (Zea mays L.) EM SUCESS O A CULTURAS DE SAFRINHA NO SISTEMA PLANTIO DIRETO WEEDS IN THE DOUBLE CROPPING WITH CORN (Zea mays L.) UNDER NO-TILLAGE
Antnio Pasqualetto,Liovando Marciano da Costa,Antnio Alberto da Silva,Carlos Sigueyuki Sediyama
Pesquisa Agropecuária Tropical , 2007, DOI: 10.5216/pat.v31i2.2480
Abstract: Objetivou-se avaliar a ocorrência de espécies daninhas na cultura do milho após diversas culturas de safrinha, no sistema plantio direto. As culturas de safrinha foram milho, soja, milheto, girassol, sorgo, aveia e guandu. As plantas daninhas foram avaliadas aos 30 dias após a semeadura, por meio de amostragens ao acaso na parcela, utilizando um quadro de 0,45 m2 (1,5 m x 0,3 m), colocado perpendicularmente às linhas de semeadura e recolhendo-se todo o material verde de plantas daninhas existentes na amostra, classificando-o por espécie vegetal, agrupando as principais monocotiled neas, principais dicotiled neas e outras plantas daninhas. Os resultados demonstraram maior ocorrência das espécies Digitaria horizontalis e Commelina benghalensis na cultura do milho, independentemente da sucess o estabelecida. C. benghalensis predominou na sucess o milho-milho, e D. horizontalis na sucess o soja-milho. A menor infesta o de plantas daninhas foi observada na área em que a cultura do girassol antecede a cultura do milho. Utilizando-se o milheto como cultura de safrinha, há maior ocorrência de espécies dicotiled neas na cultura do milho, especialmente a Euphorbia heterophylla. PALAVRAS-CHAVE: Sucess es de culturas; milho; plantas daninhas. It was observed to evaluate the occurrence of the weeds, after 3 years of cultivation with successions of double cropping cultures with the culture of the corn. The double cropping cultures were: corn, soybean, pearl millet, sunflower, sorghum, oat and pigeon pea. The weeds were appraised to the 30 days after the sowing, by means of sampling to the maybe in the portion, using a icture of 0.45 m2 (1.5 m x 0.3 m), placed in a perpendicular way to the plantation lines and being picked up the whole material existent green of weeds in the sample, classifying in for vegetable species, containing the main monocotiledonous, main mocotiledoneous and other weeds. The results demonstrated that there was larger frequency of the species there would Digitaria horizontalis and Commelina benghalensis, the first in the succession corn-corn and second in the succession soybean-corn. The smaller concentration of weeds happened in the succession sunflowercorn. The smallest occurrence of the weeds was observed in the area in that the culture of the sunflower precedes the culture of the corn. Being used the pearl millet in double cropping culture, there is bigger occurrence of species dicotiledoneous in the culture of the corn, especially Euphorbia heterophylla. KEY-WORDS: Successions of cultures; corn; weeds.
Para se entender melhor o contexto da visita do Presidente Ahmadinejad ao Brasil
ANTNIO JORGE RAMALHO DA ROCHA
Meridiano 47 : Boletim de Análise de Conjuntura em Rela??es Internacionais , 2009,
Abstract: O artigo trata da visita do Presidente do Ir , Ahmadinejad, ao Brasil. Nesse sentido, aborda a tentativa de Teer de aproximar-se de Brasília, com vistas a diminuir o isolamento do país na comunidade internacional
O significado dos recentes gastos militares do Brasil em perspectivaO significado dos recentes gastos militares do Brasil em perspectiva
ANTNIO JORGE RAMALHO DA ROCHA
Meridiano 47 : Boletim de Análise de Conjuntura em Rela??es Internacionais , 2009,
Abstract: O artigo trata do rearmamento do Brasil. Ele destaca a necessidade de o país modernizar as suas for as armadas.
O significado da elei o do Presidente Obama
ANTNIO JORGE RAMALHO DA ROCHA
Meridiano 47 : Boletim de Análise de Conjuntura em Rela??es Internacionais , 2009,
Abstract: o artigo trata da transi o de poder dos republicanos para os democratas. Analisa as possibilidades de recupera o do prestígio dos Estados Unidos perante o mundo.
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