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Search Results: 1 - 10 of 643845 matches for " Silva Ivandro de Fran?a da "
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Avalia??o quantitativa e qualitativa da fitomassa de leguminosas para uso como cobertura de solo
Nascimento, Jo?o Tavares;Silva, Ivandro de Frana da;
Ciência Rural , 2004, DOI: 10.1590/S0103-84782004000300047
Abstract: twelve species of tropical legumes (crotalaria juncea l, cajanus cajan l, cajanus cajan (l) millsp, calopogonium mucunoides l, canavalia ensiformis l, dolichos lab lab l, pueraria phaseoloides l, macroptilium atropurpureum l, leucaena leucocephala l, clitoria ternatea l, styzolobium aterrimum l, styzolobium cinereum piper and tracy) was evaluated for use as green manure or cover crops in an experiment in alagoinha-pb, brazil. the used experimental design was a ramdomized complete block design, with 12 treatments in plots of 20m2, with three repetitions .the largest biomass quantities were produced for leucaena leucocephala, cajanus cajan, styzolobium aterrimum, pueraria phaseoloides, canavalia ensiformis and clitoria ternatea, while crotalaria juncea, produced the smallest biomass. the biomass of pueraria phaseoloides, was shown with better quality for the incorporation.
Avalia o quantitativa e qualitativa da fitomassa de leguminosas para uso como cobertura de solo
Nascimento Jo?o Tavares,Silva Ivandro de Frana da
Ciência Rural , 2004,
Abstract: Para uso como adubo verde em um experimento em Alagoinha-PB, avaliaram-se doze espécies de leguminosas: crotalária (Crotalaria juncea L), guandu (Cajanus cajan L), guandu an o (Cajanus cajan (L) Millsp), calopog nio (Calopogonium mucunoides L), feij o-de-porco (Canavalia ensiformis L), lab-lab (Dolichos lab lab L), kudzu tropical (Pueraria phaseoloides L), siratro (Macroptilium atropurpureum L), leucena (Leucaena leucocephala L), cunh (Clitoria ternatea L), mucuna preta (Styzolobium aterrimum L), e mucuna cinza (Styzolobium cinereum Piper e Tracy), no DBC com 12 tratamentos, em parcelas de 20m2, com três repeti es. Constataram-se as maiores produ es de fitomassa para leucena, guandu, mucuna preta, kudzu tropical, feij o-de-porco e cunh , enquanto que para a crotalária, a menor produ o. A fitomassa do kudzu tropical mostrou-se com melhor qualidade para a incorpora o.
Efeito de leguminosas nos atributos físicos e carbono organico de um Luvissolo
Nascimento, Jo?o Tavares;Silva, Ivandro de Frana da;Santiago, Roberval Diniz;Silva Neto, Luiz de Frana da;
Revista Brasileira de Ciência do Solo , 2005, DOI: 10.1590/S0100-06832005000500018
Abstract: soil degradation under cultivation results mainly from the inadequate management and it reflects in low crop yields. with the purpose of evaluating the effect of legumes on physical attributes and organic carbon content of an alfisol, an experiment was conducted in the alagoinha county-pb, brazil, between 1997 and 1999, with the following species: crotalaria juncea l, cajanus cajan l, cajanus cajan (l) millsp, calopogonium mucunoides l, canavalia ensiforme l, dolichos lab lab l, pueraria phaseoloides l, macroptilium atropurpureum l, leucaena leucocephala l, clitoria ternatea l, styzolobium aterrimum l, styzolobium cinereum piper and tracy, besides a plot with spontaneous vegetation as control treatment. a randomized split plot design was used with thirteen treatments in the main plot (12 legumes + 1 control treatment) and three split-plot treatments were represented by the three soil sampling depths 0.00-0.10; 0.10-0.20; and 0.20-0.30 m, with three replications. under the experimental climate and soil conditions during the three years of study, it was observed that the cultivation of legumes in the plots did not affect the organic carbon content, density, total porosity, water-dispersible clay, and aggregate stability of the soil in comparison to the control treatment.
Avalia??o de métodos de determina??o de água disponível em solo cultivado com algod?o
Souza, Carlos Cleide de;Oliveira, Francisco Assis de;Silva, Ivandro de Frana da;Amorim Neto, Malaquias da Silva;
Pesquisa Agropecuária Brasileira , 2002, DOI: 10.1590/S0100-204X2002000300015
Abstract: the main objective of this work was to evaluate two methods of determination of soil available water (a direct method and other in laboratory) and the effect of three levels of available water (10, 25 and 40%) in cotton crop (gossypium hirsutum l. r. latifolium hutch). this work was developed in green house condition in the departamento de solos e engenharia rural/centro de ciências agrárias/universidade federal da paraíba, located in areia, pb, brazil. a completely randomized block was utilized in a 2 x 3 factorial arrangement, with three replications. the variance analysis showed that the values of the available water in soil using the direct method were significantly (p £ 0.05) bigger than the lab method. the management of irrigation in the cotton crop using 40% of available water determinated through the direct method showed the better results of evapotranspiration, leaf area, aboveground biomass. there was interaction of methods x levels of available water for all variables studied.
Avalia??o de métodos de determina??o de água disponível e manejo da irriga??o em terra roxa sob cultivo de algodoeiro herbáceo
Souza, Carlos Cleide de;Oliveira, Francisco Assis de;Silva, Ivandro de Frana da;Amorim Neto, Malaquias da Silva;
Revista Brasileira de Engenharia Agrícola e Ambiental , 2000, DOI: 10.1590/S1415-43662000000300006
Abstract: this study was conducted in greenhouse conditions at the dser/cca/ufpb, located in areia, pb, brazil. the main objective was to evaluate two methods of determination of available soil water, a direct method (dm) and a laboratory method (lm), and the effect of three levels of available water, 10, 25 and 40% as indicative of irrigation management in cotton crop (gossypium hirsutum l. r. latifolium hutch). a completely randomized block was utilized in a 2 x 3 factorial scheme, with three replications. the variance analysis showed that the values of the available soil water using the direct method were significantly (p < 0.01) higher than the laboratory method. the management of irrigation in the cotton crop using 40% of available water by dm, showed better results of evapotranspiration, leaf area and above ground biomass. interaction of methods versus levels of available water for all variables studied was also found.
Avalia o de métodos de determina o de água disponível em solo cultivado com algod o
Souza Carlos Cleide de,Oliveira Francisco Assis de,Silva Ivandro de Frana da,Amorim Neto Malaquias da Silva
Pesquisa Agropecuária Brasileira , 2002,
Abstract: O objetivo deste trabalho foi avaliar dois métodos de determina o de água disponível no solo (um direto e outro de laboratório), e o efeito de três níveis de água disponível (10%, 25% e 40%) na cultura do algodoeiro herbáceo (Gossypium hirsutum L. r. latifolium Hutch). O trabalho foi realizado em casa de vegeta o do Departamento de Solos e Engenharia Rural/Centro de Ciências Agrárias/Universidade Federal da Paraíba, Município de Areia, PB. O delineamento experimental adotado foi o de blocos ao acaso, com distribui o em esquema fatorial 2 x 3, com três repeti es. Conforme a análise de variancia, a faixa de água disponível no solo, encontrada mediante a utiliza o do método direto, supera significativamente (p £0,05) a obtida pelo método de laboratório. O manejo das irriga es do algodoeiro com base em 40% da água disponível, determinado pelo método direto, proporcionou os maiores resultados de evapotranspira o, de área foliar e acumula o de fitomassa na parte aérea da cultura. Observou-se ainda intera o métodos x níveis de água disponível em todas as variáveis estudadas.
Semeadura direta na produ??o do milho em agricultura de sequeiro na regi?o Nordeste do Brasil
Silva, Antonio Sousa;Silva, Ivandro de Frana da;Silva Neto, Luís de Frana da;Souza, Cícero de;
Ciência Rural , 2011, DOI: 10.1590/S0103-84782011000900011
Abstract: when efficiently introduced, no-tillage system benefices soil and crops. in brazil, no-tillage studies are concentrated in south and center-west regions, being necessary information about it in northeast region. the aim of this study was to evaluate the no-tillage influence on maize yield under rainfed agriculture in northeast brazil, in an experiment conducted during seven years. the crops of maize (zea mays) and pigeon pea (cajanus cajan) were used in three soil management systems: maize in conventional tillage (cc), maize in no-tillage (sd), maize in no-tillage plus pigeon pea sowed in the interrow (sg), with presence and absence of mineral n, p and k fertilization. soil samples were collected at the beginning and the end of the experiment to determine soil bulk density, soil particle density, total porosity, dry and wet mean weight aggregate diameters and aggregate stability index. it was also quantified soil cover rate and maize yield. the soil porosity and aggregate stability were lower after the study period. soil coverage increased significantly, about 96 % of the area under sd and sg systems, early in the culture development. mineral fertilization and no-tillage systems highly influenced the maize yield. the rainfall was the factor that caused greater variability on the results of this study.
Amostragem para avalia??o da fertilidade do solo em fun??o do instrumento de coleta das amostras e de tipos de preparo do solo
Oliveira, Fábio Henrique Tavares de;Arruda, Jandeilson Alves de;Silva, Ivandro de Frana da;Alves, Jailson do Carmo;
Revista Brasileira de Ciência do Solo , 2007, DOI: 10.1590/S0100-06832007000500014
Abstract: the measures of the average and variability of soil fertility indexes can vary with the sampling tool and soil tillage type. soil sampling methods must be developed that are more reliable to represent the real conditions of soil fertility. this study aimed at an evaluation of the effects of the cutting shovel and hand auger on measures of average and variability of the soil fertility index (a) under no-tillage (nt) and conventional tillage (ct), (b) to estimate the minimum number of simple samples to form a composite sample and (c) to test the hypothesis that the arithmetic average of simple samples is equal to the result of the chemical analysis of the composite sample. chromic luvisol samples were collected in a control experiment of soil tillage type, planted with corn. in a 81 m2 plot under nt 48 simple soil samples were collected, 24 with a cutting shovel (perpendicularly to the furrow and in-between two furrows) and 24 with auger hole, in controlled sampling (four samples collected in the planting furrow, 8 to 10 cm away from the furrow and 12 in-between the furrows), close to the points of sampling with the cutting shovel. the procedure was repeated in a second plot under ct. composite samples of different numbers of simple samples (4, 8, 12, 16 and 24 simple samples/composite samples), with three repetitions were prepared for each combination of soil tillage type - collection tool. the ph and the contents of p, k+ ca2+, mg2+ and organic matter (om) were determined in all simple and composite samples. the variability of the evaluated characteristics in samples collected with auger hole was greater than with the cutting shovel, independent of the soil tillage type. for both collection tools, the decreasing order of variability was: p > mg2+ > k + > ca2+ > om > ph. the medium fertility of a field under nt or under ct after the crop and before subsequent soil preparation can be evaluated with the auger hole, substituting the cutting shovel, if the composite samp
Aduba??o organica da batata com esterco bovino no município de Esperan?a - PB
Borchartt, Lucas;Silva, Ivandro de Frana da;Santana, Edivania de Oliveira;Souza, Cícero de;Ferreira, Leonardo Elias;
Revista Ciência Agron?mica , 2011, DOI: 10.1590/S1806-66902011000200030
Abstract: in the paraíba state the potato shows a low yield, due to the rain seasonality allied to the low soil fertility. this study aimed to evaluate the bovine manure efficiency in the organic fertilization of potato. the experiment was carried out in esperan?a county, in a regolithic neossoil. the design used was randomized blocks, with bovine manure application in quantities of 0; 3; 6; 9; 12; 15; 18; 21 and 24 t ha -1 and 10 t ha -1 of bovine manure + npk with percentages of 0; 12.5; 25; 37.5; 50; 62.5; 75; 87.5; and 100% of the formula 120-80-90 ( n-p2o5-k2o ), calculated by the soil analysis. the variables evaluated were: number and weight of tubers per plant, total yield and commercial; yield losses and dry matter of tubers. the use of bovine manure and bovine manure + npk provided an increase in weight of tubers per plant, total yield and commercial potato tubers. this way, it is observed that the bovine manure is a good alternative as organic fertilization to the potato producers of this county.
TEMPORAL VARIABILITY OF PLUVIAL PRECIPITATION AND YIELD OF HERBACEOUS COTTON IN DIFFERENT SYSTEMS OF SOIL MANAGEMENT AND NITROGEN FERTILIZATION VARIABILIDADE TEMPORAL DA PRECIPITA O PLUVIOMéTRICA E RENDIMENTO DO ALGODOEIRO HERBáCEO EM DIFERENTES SISTEMAS DE MANEJO DE SOLO E DE ADUBA O NITROGENADA
Antonio Clementino dos Santos,Albericio Pereira de Andrade,Ivandro de Frana da Silva,Gilvaneide Alves de Azeredo
Pesquisa Agropecuária Tropical , 2007, DOI: 10.5216/pat.v36i2.2148
Abstract: In order to analyze the effects caused by rain temporal variability on development of herbaceous cotton as a function of nitrogen fertilization and soil management system, experiments were carried out during four years in Alagoinha, Paraíba State, Brazil (1995, 1996, 1997, and 1999). It was used the cultivar CNPA 7H sowed in bed pits and in beds covered with plastic under four rates of nitrogen (0 kg ha-1, 30 kg ha-1, 60 kg ha-1 and 90 kg ha-1) in radomized blocks with three replications. Crop phenological stages, biomass accumulation, and yield and its components were analyzed. The annual rainfall average in the period was 1,028 mm with large variation in the total amount of precipitation among the years evaluated, and its distribution in each year. It is clearly obseved the rainy period from March through August. The vegetative and reproductive stages of the crop changed according to the rain distribution during the cottondevelopment phases. There was a large variation among soil management systems and nitrogen doses as a function of time. KEY-WORDS: Gossypium hirsutum L.; fertilization; phenological stage; biomass. O objetivo desta pesquisa foi avaliar os efeitos da variabilidade temporal da precipita o pluvial sobre o desenvolvimento do algodoeiro herbáceo, em fun o da aduba o nitrogenada e de sistemas de manejo do solo. Realizaram-se experimentos no município de Alagoinhas-PB, nos anos de 1995, 1996, 1997 e 1999. Utilizou-se a cultivar CNPA 7H, plantada em cova, em camalh o desnudo e em camalh o com plástico, sob quatro doses de nitrogênio (0 kg ha-1, 30 kg ha-1, 60 kg ha-1 e 90 kg ha-1). O delineamento experimental foi blocos casualizados com três repeti es. Nos experimentos, avaliaram-se os estágios fenológicos da cultura, a acumula o e o rendimento de biomassa, bem como os seus componentes. Verificou-se uma precipita o pluvial média anual de 1.028 mm, com grande varia o da quantidade total de precipita o entre os anos avaliados e de sua distribui o durante cada ano, sendo nítido o período chuvoso nos meses de mar o a agosto. Os estágios vegetativo e reprodutivo do algodoeiro variaram de acordo com a distribui o da precipita o pluvial durante as fases de desenvolvimento, tendo ocorrido grande varia o em rela o aos sistemas de manejo do solo e às doses de nitrogênio em fun o do tempo. PALAVRAS-CHAVE: Gossypium hirsutum; aduba o; estágios fenológicos; biomassa.
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