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Search Results: 1 - 10 of 4417 matches for " Willians Cesar Carrega "
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Effect of Infestation of Alabama argillacea (Lepidoptera: Noctuidae) at Different Ages of Cotton Plants in Yield  [PDF]
Marcos Doniseti Michelotto, Jacob Crosariol Netto, José Fernando Grigolli, Antonio Carlos Busoli, Willians Cesar Carrega, Everton Luis Finoto, Juliana Altafin Galli
American Journal of Plant Sciences (AJPS) , 2014, DOI: 10.4236/ajps.2014.510159
Abstract:

The cotton leafworm is an important defoliating pest of cotton in Brazil, and occurs in all regions where the crop is cultivated. The purpose of this study was to evaluate the effect of larval densities of A. argillacea after different infestation periods on the yield components of four cotton cultivars. The experiment was carried out in Pindorama, SP, Brazil, in the 2008/2009 growing season. The cultivars IAC-25, DeltaOPAL, Fibermax 966 and Fibermax 993 were artificially infested with A. argillacea larvae at three times (30, 60 and 90 DAE) and four densities (0, 2, 4, and 6 larvae per plant). The average boll weight (g), fiber percentage (%), 100-seed weight (g) and yield (kg·ha-1) were evaluated. With increasing infestation density of A. argillacea, the cotton yield of the cultivars decreased. The presence of larvae significantly reduced the weight of 100 seeds of cultivar Fibermax 966. Initial infestations reduced the boll weight of IAC-25 and DeltaOPAL, while cultivars Fibermax 966 and Fibermax 993 were most affected by late infestations. Early infestation compromised fiber percentage of cultivar DeltaOPAL and late infestations were most harmful to cultivar Fibermax 966. Early A. argillacea infestation reduced the yield of DeltaOPAL, while infestations 60 DAE caused the most damage to IAC-25, and the other cultivars were not affected by the moment of infestation.

Efeito da aplica o de fungicida sobre caracteres agron micos e severidade das doen as de final de ciclo na cultura da soja. = Effect of fungicide application on Agronomic characteristics and final cycle diseases severity in soybean.
Everton Luis Finoto,Willians Cesar Carrega,Tuneo Sediyama,José Anchieta Alves de Albuquerque
Agro@mbiente On-line , 2011,
Abstract: Nas últimas safras, um complexo de doen as, chamadas de doen as de final de ciclo da soja (DFC), vem provocando redu es consideráveis no rendimento da cultura. Atualmente, n o há variedades resistentes a todos os patógenos causadores das DFC. Objetivou-se no presente trabalho avaliar o efeito da aplica o de fungicida em diferentes estádios reprodutivos, nos caracteres agron micos e severidade das DFC em três cultivares de soja de diferentes grupos de matura o. O trabalho foi conduzido em área experimental da Universidade Federal de Vi osa. Foram realizados quatro tratamentos com fungicida sendotrês aplica es em estádios reprodutivos diferentes (R5, R5,5 e R6) e a testemunha sem aplica o. As cultivares utilizadas foram: BRSMG Lideran a, UFVS 2001 e UFVS 2003. Foi avaliado: altura da planta, altura da inser o da primeira vagem, número de nós por planta, número de vagens por planta, peso total da planta e peso de sementes. A severidade das DFC foi avaliada no estado R6 através de escala de notas. Os dados das avalia es foram submetidos aos testes de normalidade e homogeneidade constatando-se a desnecessidade de transforma es. Realizou-se as análises de variancia e as médias foram comparadas pelo teste de Tukey, a 5% de probabilidade de erro. Na avalia o da severidade das doen as, foi constatada a presen a dos seguintes patógenos: Septoria glycines, Cercospora kikuchii e Peronospora manshurica. Para a avalia o das características agron micas foi observado que a cultivar UFVS 2001 apresentou maiores alturas de planta. A cultivar UFVS 2003 apresentou maior númerode nós e também maior produtividade de gr os, seguida pela cultivar Lideran a. A aplica o de fungicida proporcionou o controle satisfatório de Septoria glycines no folíolo, quando realizada no estádio R5. A aplica o do fungicida proporcionou também aumento na produtividade de gr os, sendo os melhores resultados obtidos quando realizada no estádio R5 ou R5,5. = In recent seasons, a complex disease, called late season disease of soybean (DFC), has led to considerable reductions in crop yield. Currently there are no varieties resistant to all pathogens of DFC. This study aimed to determine the effects of the fungicide application in different reproductive stages, in the agronomic characteristics and severity of the DFC on three cultivars of soybean in different maturation groups. The present study was developed in experimental field in the Federal University of Vi osa. Four treatments with fungicide were applied in the stage R5, R5,5 and R6, and one additional treatment without anyapplication.
Phytosociology of weeds under different soil management systems in field reform of raw sugarcane. = Fitossociologia de plantas daninhas sob diferentes sistemas de manejo de solo em áreas de reforma de cana crua.
Maria Beatriz Bernardes Soares,Everton Luis Finoto,Denizart Bolonhezi,Willians Cesar Carrega
Agro@mbiente On-line , 2011,
Abstract: The aim of this study was the phytosociological survey of weeds in areas of reform of raw cane, kept fallow after the use of three soil management systems in two regions of S o Paulo. The study was conducted during 2007/08 crop year, in commercial production in the municipalities of Novais and Guaira. The last harvest of sugarcane was done in the first fortnight of July 2007. We used randomized block design, the treatments consisted of three soil tillage systems: conventional tillage, minimum tillage and no tillage. After treatments of tillage plots were maintained in a fallow period of 150 days. We carried out sampling in each plot by doing the identification, counting and collecting all the shoots of the weeds present. The data were interpreted statistically by ANOVA and Tukey’s test, then calculated the phytosociological index. No-tillage gave lower dry matter and fewer weeds than the other soil management systems in two growing regions. The Guaira region had a higher weed infestation that the region of Novais, where the species that stood out, presenting high IVR in all types of management was the Cyperus rotundus L. The importance of this species decreased with the use of more conservation managements. The similarity between tillage and conventional tillage was lower in both regions.
Weeds in raw sugar cane renovation area with different systems of management on soil and green manure succession = Plantas daninhas em área de reforma de cana crua com diferentes manejos do solo e adubos verdes em sucess o
Maria Beatriz Bernardes Soares,Everton Luis Finoto,Denizart Bolonhezi,Willians Cesar Carrega
Agro@mbiente On-line , 2012,
Abstract: The renewal of plantations is important to maintain high agricultural productivity of the culture of sugar cane and is performed after 5 cuts. In order to compare the residual effects of crop succession in different planting systems on the spontaneous occurrence of weeds in the area of reform of sugarcane, the experiment was done on Acrisol eutrophic soil, located in the city of Novais, S o Paulo, in sugar cane harvested without prior burning in the last five cuts. The randomized block design with treatments arranged in split plot and arranged in four replications was used. The main treatments consisted of three cropping systems, conventional tillage, minimum tillage, and no tillage. Secondary treatments consisted of two choices of green manure (sunnhemp and velvet bean) and a fallow plot. After 180 days of harvest of sugar cane was counted the number of weeds.m-2 and determined the dry mass of shoots, calculating their phytosociological index. Among the management systems of soil, the no tillage system showed a suppressive effect of weeds, resulting in fewer plants, less dry mass of plants and less variety of species, suppressing species that are considered important in the culture of sugar cane. The minimum tillage method revealed intermediate results and conventional tillage was most affected by weeds. Among the green manure planted in succession to sugar cane, the velvet bean is highlighted, and shows suppressive effect of the most important weeds in fields planted with conventional soil tillage. = A renova o dos canaviais é importante para manter elevada a produtividade agrícola da cultura e é realizada em média após cinco cortes, com o objetivo de comparar o efeito residual das culturas de sucess o nos diferentes sistemas plantio sobre a ocorrência espontanea de plantas daninhas em área de reforma de cana crua, instalou-se o experimento sobre ARGISSOLO VERMELHO-AMARELO Eutroférrico, localizado no município de Novais-SP, em canavial colhido sem queima prévia nos últimos cinco cortes. Utilizou-se delineamento experimental blocos casualizados, com os tratamentos arranjados em parcelas sub-divididas, com quatro repeti es. Os tratamentos principais consistiram dos três sistemas de cultivo; convencional, cultivo mínimo e plantio direto. Os tratamentos secundários foram constituídos de duas op es de adubos verdes (crotalária e mucuna) e uma parcela em pousio. Após 180 dias da colheita da cana-de-a úcar contou-se o número de plantas daninhas m-2e determinou-se a massa seca da parte aérea, calculando seus índices fitossociológicos. Dentre os sistemas de
Emergence of seedlings of wild peanut species
Willians Cesar Carrega,Marcos Doniseti Michelotto,Everton Luis Finoto,Alessandra Pereira Fávero
Biotemas , 2011,
Abstract: This research aimed to evaluate, after two periods of storage, the emergence of seedlings of wild peanut species, under the treatment of seeds with ethylene and manual peeling of the fruits. The trials were carried out in a laboratory of Apta, at Polo Regional Centro Norte, in Pindorama – Sao Paulo, Brazil. Seven seedling samples of fi ve species (Arachis stenosperma, A. kuhlmannii, A. monticola, A. gregoryi, and A. williamsii) were used in the trials. The seeds were peeled or not (removal of the pericarp), and they were treated or not with ethylene for breaking the dormancy after they underwent a storage under natural conditions for 130 (assay 1) and 500 days (assay 2) after harvesting (DAH). All accessions presented a higher emergence of seedlings when submitted to ethylene treatment, indicating the presence of dormancy in seeds, especially for 130 days of storage. The seeds of A. monticola presented a significant dormancy even after 500 days of storage. The wild species had different responses with regard to the emergence capacity of seedlings after the removal of pericarp, but at 130 days they presented, generally, a higher emergence without pericarp; however, due to the long period of storage, it seems they become sensitive to the peeling, germinating better with the pericarp.
Imobiliza??o da inulinase de Kluyveromyces marxianus para a hidrólise de extratos de Helianthus tuberosus L.
Gaspari, Jefferson Willians de;Gomes, Luiz Humberto;Tavares, Flavio Cesar Almeida;
Scientia Agricola , 1999, DOI: 10.1590/S0103-90161999000500015
Abstract: this experiment studied the immobilization of inulinase from kluyveromyces marxianus in different supports to bioconvert the inulin from helianthus tuberosus. inulin was extracted from h. tuberosus tubers, desproteinized and concentrated to 25% total reducing sugars. inulinase from k. marxianus was concentrated in a rotative evaporator and immobilized onto chitin (with and without glutaraldehyde), sodium alginate (2 and 4%), pectin, a dialysis membrane or controlled-porosity silicate. on chitin, with or without glutaraldehyde, the imobilization rate was 73 and 48 u g-1 respectively. however the hydrolysys of 1g l-1 inulin was very low in both treatments (2.4 % per hour). in sodium alginate gel of 2% and 4% concentration, the conversion was 12% and 26% per hour, respectively. immobilization onto pectin was not possible due to a high activity pectinase in the enzyme extract. binding of the enzyme onto dialysis membrane provided recovery of 50% total reducing sugars (42g) in 6h of operation. the controlled-porosity silicate showed an imobilization rate of 43 u g-1 silicate, hydrolyzing 43% of substrate per hour. this activity was, however, exhausted quickly during the process.
Imobiliza o da inulinase de Kluyveromyces marxianus para a hidrólise de extratos de Helianthus tuberosus L.
Gaspari Jefferson Willians de,Gomes Luiz Humberto,Tavares Flavio Cesar Almeida
Scientia Agricola , 1999,
Abstract: Este trabalho estudou a imobiliza o da inulinase de Kluyveromyces marxianus em diferentes suportes, com a finalidade de promover a bioconvers o da inulina de Helianthus tuberosus. A inulina de H. tuberosus foi extraída dos tubérculos, desproteinizada e concentrada a 25% de a úcares redutores totais (ART). A inulinase de K. marxianus foi concentrada em evaporador rotativo e imobilizada em quitina (com e sem glutaraldeído), alginato sódico (concentra es de 2 e 4%), pectina, membrana de diálise e sílica de porosidade controlada (SPC). Em quitina obteve-se taxas de imobiliza o de 73Unidades/g com glutaraldeído e 48 U/g sem glutaraldeído, mas a hidrólise foi baixa em ambos os tratamentos, o equivalente a 2,4% por hora. Em gel de alginato sódico, nas concentra es de 2 e 4%, converteram-se, respectivamente, 12% e 26%, em 1h. A imobiliza o em pectina foi impossibilitada devido à presen a de pectinase no extrato enzimático. A conten o da enzima com o substrato em membrana de diálise proporcionou uma recupera o de 50% do ART em 6h. A SPC apresentou taxa de imobiliza o de 43 U/g sílica, proporcionando a hidrólise de 43% em 1h, entretanto sua atividade foi se exaurindo rapidamente durante o processo devido à inativa o natural da enzima e a conforma o dos poros da SPC.
La Orden del Caballero Bondi
Barreto,Willians;
Interciencia , 2009,
Abstract: the direct and indirect relationship between the british physicist originally from austria, sir hermann bondi, and venezuelan physics are presented. special emphasis is made of his most remarkable human qualities, nobility and humbleness, besides his important contribution to general relativity and to the european science agencies. self-declared as a staunch disciple of popperian philosophy, bondi defended the "hard and dirty" physics against the "immaculate and beautiful" physics. attention is focused on two cornerstones of bondi?s work, followed thoroughly by luis herrera and disciples in venezuela.
Une carte de la réserve d'eau du sol utilisée comme indicateur climatique (France)
Pierre CARREGA
Mappemonde , 1987,
Abstract: Une carte de la réserve d'eau du sol, alimentée par les pluies et vidée par l'évapotranspiration, fait appara tre de grandes différences climatiques en France.
Risque de feu et habitat dispersé dans le Sud de la France
Pierre Carrega
Finisterra - Revista Portuguesa de Geografia , 1992,
Abstract:
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