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Tratamento inseticida e qualidade de sementes de milho durante o armazenamento
Smiderle, Oscar José;Cicero, Silvio Moure;
Scientia Agricola , 1999, DOI: 10.1590/S0103-90161999000500028
Abstract: to study the effects of insecticides (deltamethrin, chlorpyrifos, phosphin, and diatomaceous earth) on the insect control of stored corn seeds during 12 months, this research was performed to find an alternative product, using a randomized design. seeds of the hybrid ag 303 were treated with either isolated or combined deltamethrin and chlorpyrifos, phosphin and diatomaceous earth, and they were further arranged into multifoliated paper bags and stored for twelve months (may/1997 through april/1998) under normal environmental conditions. seeds were submitted to an infested seed exam, mass of 100 seeds, germination test, cold test, accelerated aging, electric conductivity test, emergence of seedlings in field and rate of seedling emergence, seven times in bimonthly intervals. interpretation of the results showed that: deltamethrin and chlorpyrifos insecticides (alone or combined), phosphin and diatomaceous earth promoted the control in a similar manner, of pest-insects occuring during storage without causing toxicity to corn seeds. the physiological quality of corn seeds was effectively preserved by the addition of chemical insecticides and diatomaceous earth.
Rendimento e Qualidade de Sementes de Feij o-caupi em Fun o de Doses de Nitrogênio. = Cowpea yield and seed quality as a function of nitrogen application.
Oscar José Smiderle,Dalton Roberto Schwengber
Agro@mbiente On-line , 2008,
Abstract: O trabalho objetivou avaliar o efeito de quatro doses de nitrogênio aplicadas no solo sobre o rendimento produtivo e a qualidade fisiológica de sementes do feij o-caupi, cv. BRS Mazag o. O experimento foi conduzido na fazenda Jabuti, em Boa Vista, de janeiro a mar o/2003, sob irriga o por piv central. O delineamento utilizado foi o de blocos casualizados, com quatro tratamentos, constituídos das doses de nitrogênio (0; 20; 40; e 60 kg ha-1, utilizando uréia como fonte), aplicadas manualmente, em quatro repeti es. Para as avalia es foram utilizadas parcelas de seis metros lineares por seis fileiras de plantas, semeadas mecanicamente, espa adas de 0,45 m, com área útil de 3,6 m2. Para avaliar a qualidade fisiológica das sementes foi conduzido um experimento em laboratório com delineamento inteiramente casualizado, com quatro repeti es de 50 sementes cada. Os resultados indicam que n o houve efeito do nitrogênio aplicado sobre o número de gr os por vagem, enquanto o número de vagens e a massa de gr os aumentaram com as doses de nitrogênio. O nitrogênio aplicado ao solo proporcionou a produ o de sementes mais vigorosas, ocorrendo aumento linear da emergência das sementes em campo com eleva o de suas doses, passando a emergência média de 88% para 94%. A produtividade máxima de gr os (1.497 kg ha-1) foi obtida com a aplica o de 60 kg ha-1 de nitrogênio. A germina o das sementes n o aumentou em fun o da eleva o das doses de nitrogênio, apresentando uma taxa média de 91%. = An experiment was carried out to evaluate the effect of levels of nitrogen application on productive yield and physiological quality of cowpea seeds, cv. Mazag o. The experiment took place at Jabuti farm, in Brazil, from January to March/2003, under a central pivot irrigation system. The experimental design was completely randomized blocks, with four treatments consisting on nitrogen levels (0; 20; 40 and 60 kg ha-1, utilizing urea as N source) applied manually, with four replications. Each plot was 6 m long, with six lines of plants 0,45 m apart one from the other; the plants were mechanically sowed; the measuring area of the plot was 3,6 m2. The physiological quality of the seeds was assessed through an experiment conducted in laboratory conditions, in an entirely randomized design, with 4 replicates of 50 seeds each. The results indicate that there was no effect of applied N on number of grain per pod, whereas the number of pods and grain mass increased with N doses. N applied to soil provided a production of more vigorous seeds, occurring a linear increase in field seedling em
Tratamento inseticida e qualidade de sementes de milho durante o armazenamento
Smiderle Oscar José,Cicero Silvio Moure
Scientia Agricola , 1999,
Abstract: A presente pesquisa objetivou verificar os efeitos dos inseticidas deltametrina, clorpirifos, fosfina e da terra diatomácea no controle de insetos em sementes de milho, armazenadas durante 12 meses, visando oferecer alternativas de produtos inseticidas, utilizando delineamento inteiramente casualizado. As sementes do híbrido AG 303, tratadas com deltametrina e clorpirifos, aplicados na forma isolada ou em combina o, fosfina e terra diatomácea, foram acondicionadas em sacos de papel multifoliado e armazenadas por doze meses (maio/1997 a abril/1998) em condi es normais de ambiente. Em intervalos bimestrais, sete épocas no total, as sementes foram submetidas às seguintes determina es: exame de sementes infestadas, massa de 100 sementes, teste de germina o, teste de frio, envelhecimento acelerado, condutividade elétrica, emergência de plantulas em campo e velocidade de emergência de plantulas. A análise dos dados e interpreta o dos resultados permitiram concluir que: os inseticidas deltametrina e clorpirifos (isolados ou associados), a terra diatomácea e a fosfina promovem, de maneira similar, o controle de insetos-praga que ocorrem no armazenamento e n o causam toxicidade às sementes; a qualidade fisiológica das sementes é efetivamente preservada pelos tratamentos com inseticidas químicos e terra diatomácea.
Avalia??o de cultivares de girassol em savana de Roraima
Smiderle, Oscar José;Mour?o Jr, Moisés;Gianluppi, Daniel;
Acta Amazonica , 2005, DOI: 10.1590/S0044-59672005000300004
Abstract: sunflower (helianthus annuus l.) can be cultivated at different times of the year. hence, this oilseed crop stands out among the viable crops to be explored in the savanna area of roraima. however, cultivars can perform differently depending on the region they are grown. accounting on this, a study was carried out to evaluate the effect of sowing time for this crop in boa vista, roraima, utilizing six cultivars (agrobel 910; agrobel 920; cargill 11; embrapa 122; morgan 742; and rumbosol 91) in a split-plot scheme, in a randomized complete blocks design, with two plots (sowing time: january 20, with supplementation of water, and july 19). the sub-plots consisted of four rows, measuring 6 m each, distanciated 0.90 m; the distance between plants inside the row was 0,30 m. the cultivars cargill 11, rumbosol 91 and agrobel 910 were the most productive for cultivation in the savanna ecosystem in roraima. the sowing of sunflower in january was more appropriate than july.
épocas de colheita e qualidade fisiológica das sementes de arroz irrigado cultivar BRS 7 TAIM, em Roraima
Smiderle, Oscar José;Pereira, Paulo Roberto Valle da Silva;
Revista Brasileira de Sementes , 2008, DOI: 10.1590/S0101-31222008000100010
Abstract: harvesting time is one of most important factors which influence rice seed characteristics for the purpose of planting or milling. with the objective to determine the proper period of harvesting of irrigated rice (oryza sativa l.) the seeds of brs 7 taim cultivar were harvested at at 15, 22, 29, 36, 43 and 50 days after flowering, dryed, processed for cleaning purpose and evaluated in relation to moisture, productivity, dry weight of 100 seeds, undamaged rice yield, viability and storability. seeds harvested at 15 and 22 days after flowering showed low performance exhibiting deficiency in all variables studied, besides high initial humidity. seeds harvested at 29 days showed hight quality, but yield was lower than those of later periods. those obtained from harvest at 50 days showed good performance, with exception for undamaged rice yield. the best harvesting period considering taim cultivar is between 38 an 42 days after flowering, when seeds present high rates of quality, yield, dry weight, undamaged rice yield, physiological quality and storability.
Supera??o da dormência em sementes de paricarana (Bowdichia virgilioides Kunth.)
Smiderle, Oscar José;Schwengber, Luís Augusto Melo;
Revista Brasileira de Sementes , 2011, DOI: 10.1590/S0101-31222011000300003
Abstract: dormancy is a phenomenon in which seeds of a species do not germinate, even when they are viable and environmental conditions are suitable. the objective of this study was to assess the effects on seeds of different periods of immersion in boiling water, with or without posterior immersion in sodium hypochlorite, on the alleviation of paricarana (bowdichia virgilioides kunth.) seed dormancy. seeds were previously homogenized and separated according to size and color, with red-colored seeds being used. the treatments applied were: t1 = immersion in water at 100 °c for one second; t2 = immersion in water at 100 °c for 10 seconds; t3 = t2 + posterior immersion in 2.5% sodium hypochlorite for 1 minute; t4 = immersion in water at 100 °c for 20 seconds; t5 = t4 + immersion in 2.5% sodium hypochlorite for 1 minute. each treatment consisted of four replicates of 50 seeds. the highest emergence scores were obtained with seed immersion in water at 100 °c for 10 seconds, with or without the posterior use of sodium hypochlorite. this is the recommended procedure for breaking the seed tegument dormancy of paricarana (b. virgilioides). immersion of paricarana seeds in sodium hypochlorite for one minute, after seed immersion in water, facilitates imbibition and reduces seed deterioration.
Dormência em sementes de paricarana (Bowdichia virgilioides Kunth - Fabaceae - Papilionidae)
Smiderle, Oscar José;Sousa, Rita de Cássia Pompeu de;
Revista Brasileira de Sementes , 2003, DOI: 10.1590/S0101-31222003000400007
Abstract: this study was carried out at the seed laboratory of embrapa roraima, with the objective to study the alleviation of seed dormancy of the paricarana tree (bowdichia virgilioides). the experimental design was a completely randomized design with four replications of 50 seeds each. the treatments were: mechanic scarification with water sandpaper; sulfuric acid - pa (5 and 10 minutes), ethanol (5 and 10 minutes) and control. the seeds were placed in plastic boxes on moist paper and incubated at 25oc in a germinator. the parameters obtained were germination percentage, hard seed percentage, germination rate and percentage of normal seedlings at 30 days after sowing. the germinated seeds were counted daily for 30 days. chemical scarification with sulfuric acid for 5 minutes was shown to be the most appropriate method for seed alleviation of this species.
Dormência em sementes de paricarana (Bowdichia virgilioides Kunth - Fabaceae - Papilionidae)
Smiderle, Oscar José;Sousa, Rita de Cássia Pompeu de;
Revista Brasileira de Sementes , 2003, DOI: 10.1590/S0101-31222003000100012
Abstract: this study was carried out at the seed laboratory of embrapa roraima, with the objective to study the alleviation of seed dormancy in the paricarana tree (bowdichia virgilioides). the experimental design was a randomized complete block design with four replications of 50 seeds each. the treatments were: mechanical scarification with water sandpaper; sulfuric acid - pa (5 and 10 minutes), ethanol (5 and 10 minutes) and the control. the seeds were placed in plastic boxes on moistened paper and incubated at 25oc in a germinator. the parameters obtained were germination percentage, hard seed percentage, germination rate, percentage of normal seedlings at 30 days after sowing. the germinated seeds were counted daily during 30 days. chemical scarification with sulfuric acid for 5 minutes was shown to be the most appropriate method for seed alleviation of this species.
HARVEST TIME AND PHYSIOLOGIC QUALITY OF SEEDS IN IRRIGATED RICE (Oryza sativa cv. BRS RORAIMA) éPOCA DE COLHEITA E QUALIDADE FISIOLóGICA DE SEMENTES EM ARROZ IRRIGADO (Oryza sativa cv. BRS RORAIMA)
Oscar José Smiderle,Carlos Tadeu dos Santos Dias
Pesquisa Agropecuária Tropical , 2008, DOI: 10.5216/pat.v38i3.3487
Abstract: Harvest time is one of most important factors influencing rice seed characteristics for purpose of either planting or milling. With the objective to determine a proper harvesting time, irrigated rice seeds of cultivar BRS Roraima were harvested at 15, 22, 29, 36, 43 and 50 days after flowering (DAF), and assessed according to humidity, viability, dry mass of 1,000 seeds, whole grain yield, productivity and storability. Seeds harvested 29 DAF showed high quality and its productivity was equivalent to the subsequent periods. Seeds harvested 50 DAF showed good performance, except for whole grain yield. Harvests 15 and 22 DAF were unsuitable, reducing the physiologic quality of seeds, mill efficiency and high initial humidity. The adequate harvest time for cultivar BRS Roraima is between 29 and 43 DAF, when seeds present higher yield, dry mass, whole grain yield, physiologic quality and storability. KEY-WORDS: Physiologic quality; whole grain; humidity. A época de colheita é um dos fatores mais importantes que influenciam as características da semente de arroz, seja para semeadura ou para consumo. Com o objetivo de determinar a época adequada de colheita de arroz irrigado, para a cultivar BRS Roraima, sementes foram colhidas aos 15, 22, 29, 36, 43 e 50 dias após o florescimento (DAF) e avaliadas quanto à umidade, viabilidade, massa seca de 1.000 sementes, rendimento de gr os inteiros, produtividade e armazenabilidade. As sementes colhidas aos 29 DAF tiveram alta qualidade e a produtividade foi equivalente à dos períodos subseqüentes. Aquelas provenientes da colheita aos 50 DAF exibiram bom desempenho, exceto em rendimento de gr os inteiros. Colheitas realizadas aos 15 e 22 DAF s o impróprias, reduzindo a qualidade fisiológica das sementes, o rendimento de engenho e a alta umidade inicial. A época adequada de colheita para a cultivar BRS Roraima está entre 29 e 43 DAF, quando suas sementes apresentam maior produtividade, massa seca, rendimento de gr os inteiros, qualidade fisiológica e armazenabilidade. PALAVRAS-CHAVE: Qualidade fisiológica; gr os inteiros, umidade.
Supera o da dormência em sementes de pata-de-vaca (Bauhinia angulata Vell). = Overcoming dormancy of pata-de-vaca (Bauhinia angulata Vell) seeds.
Oscar José Smiderle,Francisco Joaci de Freitas Luz
Agro@mbiente On-line , 2010,
Abstract: O trabalho foi realizado no Laboratório de Análise de Sementes da Embrapa Roraima, com o objetivo de estudar métodos pré-germinativos em laboratório para a supera o da dormência de sementes de pata-de-vaca. O delineamento experimental foi o inteiramente ao acaso com sete tratamentos e 4 repeti es de 50 sementes. Os tratamentos pré-germinativos foram: escarifica o com imers o em ácido sulfúrico (PA) por 5, 10 e 15 minutos; imers o em álcool etílico por 5, 10 e 15 minutos; e testemunha, sem tratamento prévio nas sementes. As sementes foram incubadas a 25oC no interior de caixas plásticas, tipo ‘gerbox’, contendo como substrato papel ‘germitest’ umedecido. Diariamente, até 89 dias após a semeadura, foi feita avalia o da embebi o e da germina o; a partir dos dados de germina o foi estimada a velocidade de germina o. Os resultados demonstraram que os tratamentos pré-germinativos promoveram acréscimo de pelo menos 50% na germina odas sementes de pata-de-vaca, sendo que a escarifica o com ácido sulfúrico (15 minutos), revelou ser o método mais efetivo para a supera o da dormência desta espécie. A utiliza o de álcool (10 minutos) pode ser uma boa alternativa para promover a germina o de sementes de pata-de-vaca.= - This study was carried out at Seed laboratory of Embrapa Roraima, with the objective to study the overcoming dormancy of pata-de-vaca (Bauhinia angulata) seeds. The experimental design was a completely randomized design with seven treatments and four replicates of 50 seeds each. The pre-germinations treatments were: sulfuric acid - PA (5, 10 and 15 minutes), ethylene alcohol (5, 10 and 15 minutes), and control. The seeds were disposed in plastic boxes over humidified paper and incubated at 25oC in a germinator. The parameters evaluated were germination, imbibition, speed of germination, normal seedlings at 89 days after sowing. The germinated seeds were counted daily during 89 days. The results showed that with pregerminations treatments there was an increase of 50% in germination of seeds Pata de vaca tree. Chemical scarification with sulfuric acid for 15 minutes demonstrated to be the most appropriate method for suppuration of this species dormancy. The utilization of ethylene alcohol (10 minutes) might be a good alternative to promote germination of seeds of Bauhinia angulata trees.
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