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Search Results: 1 - 10 of 65854 matches for " Carlos Alberto;Braccini "
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Incidência de microorganismos em sementes de café robusta durante o armazenamento
BRACCINI ALESSANDRO DE LUCCA E,SCAPIM CARLOS ALBERTO,BRACCINI MARIA DO CARMO LANA,ANDRADE CARLOS ALBERTO DE BASTOS
Bragantia , 1999,
Abstract: Foi realizado um trabalho com o objetivo de isolar e identificar os microrganismos presentes em sementes de café robusta (Coffea canephora Pierre ex Froehner) no decorrer do armazenamento. Para tanto, sementes de café do cultivar Conillon, acondicionadas em diferentes embalagens (saco de polietileno transparente, saco de papel kraft e saco de algod o) e com graus de umidade iniciais distintos (25 e 35%) foram submetidas a cinco períodos de armazenamento (0, 3, 6, 9 e 12 meses), em condi es controladas. Após cada um desses períodos, as sementes foram avaliadas, em laboratório, quanto à sanidade (método do papel-filtro), germina o e grau de umidade. Foram isolados e identificados cinco gêneros dife-rentes de fungos infestando as sementes de café robusta, a saber: Fusarium semitectum, Colletotrichum spp., Alternaria spp., Aspergillus spp. e Penicillium spp. Observou-se predominancia de Fusarium semitectum e de Alternaria spp., no início do armazenamento das sementes, com incidência variando de 63-73% e 7-11% respectivamente. No decorrer do armazenamento, houve grande eleva o na incidência dos fungos de armazenamento dos gêneros Aspergillus spp. e Penicillium spp. nas sementes acondicionadas em diferentes embalagens. A incidência dos microrganismos mostrou grande varia o, em fun o do tipo de embalagem utilizado durante o armazenamento. O aumento na incidência dos microrganismos esteve associado com a redu o na germina o das sementes de café. O fungo Fusarium semitectum manteve-se em níveis elevados até por 12 meses nas sementes acondicionadas em embalagens de papel kraft e algod o. A embalagem de polietileno, associada ao grau de umidade inicial mais elevado, foi mais favorável na conserva o das sementes de café robusta.
Avalia??o da qualidade fisiológica de sementes de soja, após o processo de hidrata??o-desidrata??o e envelhecimento acelerado
Braccini, Alessandro de Lucca e;Reis, Múcio Silva;Sediyama, Carlos Sigueyuki;Scapim, Carlos Alberto;Braccini, Maria do Carmo Lana;
Pesquisa Agropecuária Brasileira , 1999, DOI: 10.1590/S0100-204X1999000600018
Abstract: a work was carried out with the purpose of evaluating the physiological quality of osmoconditioned soybean (glycine max (l.) merrill) seeds of ufv-10, iac-8 and doko rc varieties, in terms of response to stress induced by the accelerated aging test. seeds were osmoconditioned in peg 6000, with an osmotic potential of -0.8 mpa and 20oc of temperature, for four days. after that, seeds were dried back to the initial moisture content and submitted to the accelerated aging test for the following periods: 0, 24, 48 and 72 hours. two controls were used: untreated seeds and seeds soaked in water. after several determined accelerated aging periods, seeds were evaluated by the standard germination test, seedling length and dry biomass of seedlings. in greenhouse the speed of emergence-index and the final emergence in sand seedbed were determined. soybean seeds hydration-dehydration treatment in peg 6000 solution improved seed performance in relation to germination and vigor. the extent of the accelerated aging period affected seed performance in all parameters evaluated. however, peg 6000 treatment was satisfactory in maintaining the seed quality during the accelerated aging periods. the soybean seed water soaking affected negatively the physiological seed quality. the soybean varieties showed differential response to the hydration-dehydration treatments and to the accelerated aging periods.
Produtividade, crescimento e parti??o de matéria seca em duas cultivares de feij?o
Andrade, Carlos Alberto de Bastos;Scapim, Carlos Alberto;Braccini, Alessandro de Lucca e;Martorelli, Danilo Takara;
Acta Scientiarum. Agronomy , 2009, DOI: 10.4025/actasciagron.v31i4.6397
Abstract: growth and yield of ouro negro and brs mg talism? cultivars bean grains were characterized by field experiments, in field conditions, at the coimbra experimental station, state of minas gerais, brazil, federal university of vi?osa, minas gerais state, brazil. bean vegetative growth and grain yield of two cultivars were evaluated. samples at 12, 22, 36, 51, 65 and 76 days after emergence were collected to determine foliar area, biomass of different aerial components, foliar area index, absolute growth and net assimilation rates. grain yield and its components (number of plants per area, number of pods per plant, number of grains per pod and average mass of one hundred grains) were determined at 80 days after emergence (harvest). vegetative growth of the two cultivars was similar, although the ouro negro cultivar had higher accumulation rates of total dry matter, absolute growth rate, foliar area index and net assimilation rate. relative growth rate was higher in brs mg talism? cultivar.
Produtividade, crescimento e parti o de matéria seca em duas cultivares de feij o = Yield, growth and dry matter partition in two common bean cultivars
Carlos Alberto de Bastos Andrade,Carlos Alberto Scapim,Alessandro de Lucca e Braccini,Danilo Takara Martorelli
Acta Scientiarum : Agronomy , 2009,
Abstract: Com o objetivo de caracterizar o crescimento e a produtividade de gr os, das cultivares ‘Ouro Negro’ e ‘BRS MG Talism ’, em condi es de campo, na Esta o Experimental de Coimbra, Estado de Minas Gerais, pertencente à Universidade Federal de Vi osa (UFV), experimentos de campo foram conduzidos em que se avaliaram o crescimento vegetativo e a produtividade de gr os das duas cultivares. Foram efetuadas amostragens aos 12, 22, 36, 51, 65 e 76 dias após emergência (DAE), sendo determinadas a área foliar e a biomassa dos diferentescomponentes da parte aérea, além do índice de área foliar e das taxas de crescimento absoluto e assimilatórias líquidas. Aos 80 DAE (colheita), foram determinados a produtividade de gr os e os seus componentes (número de plantas por área, número de vagens por planta, número de gr os por vagens e massa média de 100 gr os). O crescimento vegetativo de ambas as cultivares foi semelhante, mas a cultivar ‘Ouro Negro’ apresentou os maiores valores de acúmulo de matériaseca total, taxa de crescimento absoluto, índice de área foliar e taxa assimilatória líquida. A taxa de crescimento relativo foi maior na cultivar ‘BRS MG Talism ’. Growth and yield of Ouro Negro and BRS MG Talism cultivars bean grains were characterized by field experiments, in field conditions, at the Coimbra Experimental Station, state of Minas Gerais, Brazil, Federal University of Vi osa, Minas Gerais State, Brazil. Bean vegetative growth and grain yield of two cultivars were evaluated. Samples at 12, 22, 36, 51, 65 and 76 days after emergence were collected to determine foliar area, biomass of different aerial components, foliar area index, absolute growth and net assimilation rates. Grain yield and its components (number of plants per area, number of pods per plant, number of grains per pod and average mass of one hundred grains) were determined at 80 days after emergence (harvest). Vegetative growth of the two cultivars was similar, although the Ouro Negro cultivar had higher accumulation rates of total dry matter, absolute growth rate, foliar area index and net assimilation rate. Relative growth rate was higher in BRS MG Talism cultivar.
Pre-Inoculation with Bradyrhizobium spp. in Industrially Treated Soybean Seeds  [PDF]
Fernanda Brunetta Godinho Anghinoni, Alessandro Lucca Braccini, Carlos Alberto Scapim, Guilherme Anghinoni, Glaucia Cristina Ferri, Andréia Kazumi Suzukawa, Telmo Antonio Tonin
Agricultural Sciences (AS) , 2017, DOI: 10.4236/as.2017.87044
Abstract: The objective of this study was to compare the effect of anticipated and traditional inoculation of Bradyrhizobium spp. in industrially treated soybean seeds. The experiment was conducted in a randomized complete block design, with 10 treatments and 4 replications. Different combinations of insecticides and fungicides of industrial treatment of seeds, traditional inoculation and long-term (LT) inoculation, as well as different pre-inoculation periods performed at 0, 5 and 10 days before soybean sowing were evaluated. A treatment containing only nitrogen mineral fertilization and also a control treatment were included. The characteristics number of nodules per plant, seeds Nitrogen content, number of pods per plant, mass of thousand seeds and grain yield were evaluated. Results indicated that LT pre-inoculation combined with fludioxonil and thiamedoxan allowed seed storage up to 10 days without affecting soybean yield components.
Sowing seasons and quality of soybean seeds
ávila, Marizangela Rizzatti;Braccini, Alessandro de Lucca e;Motta, Ivo de Sá;Scapim, Carlos Alberto;Braccini, Maria do Carmo Lana;
Scientia Agricola , 2003, DOI: 10.1590/S0103-90162003000200007
Abstract: considering the difficulties of producing high quality soybean [glycine max (l.) merrill] seeds during the traditional cropping period in some areas of the state of paraná, brazil, a research project was carried out with the objective of evaluating the influence of sowing dates on the physiological and sanitary quality of seeds, during the 1998/99 and 1999/00 cropping seasons, in maringá, pr, brazil. the experiment consisted of five cultivar competition assays, arranged in a completely randomized block design, with each assay sown at different dates (10/15, 10/30, 11/15, 11/30 and 12/15) for each cropping season. the evaluated cultivars were brs 132 (early), brs 133 (semi-early), br 16 (semi-early), brs 134 (intermediate) and ft- estrela (late). seeds obtained at the sowing dates were evaluated in the laboratory by germination, accelerated aging, and health tests. sowing in november resulted in seeds with superior physiological and health quality. cultivar brs 133 showed the greatest stability in seed production with better quality for the different sowing dates. cultivars brs 134 and brs 133, which were sown during the period from 10/15 to 11/30, produced seeds that had higher percentages of normal seedlings in the germination and accelerated aging tests. advancing or delaying sowing dates had adverse effects on soybean seed production with regard to their sanitary quality.
Incidência de microorganismos em sementes de café robusta durante o armazenamento
BRACCINI, ALESSANDRO DE LUCCA E;SCAPIM, CARLOS ALBERTO;BRACCINI, MARIA DO CARMO LANA;ANDRADE, CARLOS ALBERTO DE BASTOS;VIDIGAL FILHO, PEDRO SOARES;
Bragantia , 1999, DOI: 10.1590/S0006-87051999000200010
Abstract: this work aims to isolate and to identify the microorganisms associated with robusta coffee (coffea canephora pierre ex froehner) seeds during the storage period. thus, coffee seeds cv. conillon put into different packing bags (transparent plastic, kraft paper and cloth bags) and having different initial moisture contents (25 and 35%, wet basis) were submitted to five storage periods (0, 3, 6, 9 and 12 months), in controlled conditions. after each storage period seeds were evaluated in laboratory by the following tests: blotter test, standard germination test, and moisture content determination. five different fungi genera were isolated and identified as infestation of robusta coffee seeds: fusarium semitectum, colletotrichum spp., alternaria spp., aspergillus spp., and penicillium spp., fusarium semitectum (63-73%) and alternaria spp. (7-11%) were predominant at the beginning of the seed storage. during the storage period was observed great increase of storage fungi (aspergillus spp. and penicillium spp.) incidence in seeds packed in different bags. the seed infestation level showed great variation in relation to the type of packing, during the storage. the increase of fungal incidence was associated to the reduction of coffee seed germination. fusarium semitectum was observed after 12 months in seeds stored in kraft paper and cloth bags. plastic bags associated to higher initial moisture content were more efficient in preserving robusta coffee seeds.
Proposta de modelagem n?o-linear do desempenho germinativo de sementes de milho híbrido
Gazola, Sebasti?o;Scapim, Carlos Alberto;Guedes, Terezinha Aparecida;Braccini, Alessandro de Lucca e;
Ciência Rural , 2011, DOI: 10.1590/S0103-84782011005000022
Abstract: this research was developed with the goal to adjust a nonlinear regression model to estimate seed germination performance of three commercial seed lots of hybrid maize oc 705, subjected to accelerated aging test at a temperature of 43oc. the logistic model y(t)=c/(1+exp (b (t-m))) was used to fit the data. measures of bias box and parametric intrinsic bends were used for the diagnosis of the model. the proposed model fits properly to seed germination percentage data of hybrid corn seeds for oc 705, for all seed lots. based on estimates of the parameters and fit quality, the seed lot three was identified as being the best for marketing, by presenting less reduction in seed germination power over time.
Teste de comprimento de plantulas sob estresse hídrico na avalia??o do potencial fisiológico das sementes de milho
ávila, Marizangela Rizzatti;Braccini, Alessandro de Lucca e;Scapim, Carlos Alberto;
Revista Brasileira de Sementes , 2007, DOI: 10.1590/S0101-31222007000200016
Abstract: the present study was carried out with the aim of evaluating the efficiency of the seedling length test under water stress in the evaluation of the physiological potential of corn seeds and verifying its relation with seedling emergence in the field. for this reason, corn seeds from five commercial lots were evaluated by means of the germination test (first count and final count), accelerated aging, modified cold, electrical conductivity, seedling emergence in the field and seedling length test under water stress, using different levels of osmotic potential (0; -0.1; -0.3; -0.6 and -0.9mpa) in manitol solution. there was a significant and positive correletionship between the seedling length test under water stress and emergence in the field and the seedling length test under water stress to -0.9mpa was the best to evaluate the physiological potential of corn seeds.
Germina??o de sementes e crescimento de plantulas de cultivares de milho-pipoca submetidas ao estresse hídrico e salino
Moterle, Lia Mara;Lopes, Pablo de Carvalho;Braccini, Alessandro de Lucca e;Scapim, Carlos Alberto;
Revista Brasileira de Sementes , 2006, DOI: 10.1590/S0101-31222006000300024
Abstract: the water availability and the water movement though the seeds are very important to seed germination and seedlings emergence, and these factors are influenced by soil water potential, soil texture and soil-seed contact surface. knowing that soil salinity limits the growth of several plants, the purpose of this study was to evaluate the effect of water and salinity stress on seed germination and seedling growth of three popcorn cultivars (iac 112, zélia e brs-angela). the seeds were sown in germination paper substrate imbibed in potassium chloride (kcl) solutions using five levels of osmotic potential: 0.0 (control); -0.1; -0.3; -0.6 e -0.9mpa. the percentage of normal seedlings at the first and final counting of the germination test, as well as root and shoot length and dry biomass of seedlings were used to evaluate seed physiological quality. the results indicated that the reduction of the osmotic potential reduced the popcorn seed performance. there was a differential behavior between the popcorn cultivars to the salinity stress tolerance promoted by the use of kcl. the seeds of brs-angela cultivar showed better germination and seedling growth than the others, when submitted to the same level of kcl osmotic potential.
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