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Search Results: 1 - 10 of 333573 matches for " Alessandro de Lucca e;Martorelli "
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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.
Qualidade fisiológica e produtividade das sementes de milho tratadas com micronutrientes e cultivadas no período de safrinha = Physiological quality and yield of micronutrient-treated corn seed grown in the late season crop
Marizangela Rizzatti ávila,Alessandro de Lucca e Braccini,Carlos Alberto Scapim,Danilo Takara Martorelli
Acta Scientiarum : Agronomy , 2006,
Abstract: A aplica o de micronutrientes visando aumentar a produtividade tem apresentado resultados significativos, principalmente em regi es que adotam elevados níveis de tecnologia e manejo nas culturas. Com o objetivo de verificar o efeito da aplica o do fertilizante Stimulus PG. (20,0% de Zn; 3,0% de B; 1,0% de Mg e 1,0% de Mo), via tratamento de sementes, na produtividade e na qualidade fisiológica das sementes de milho produzidas no período de safrinha conduziu-se um experimento utilizando-se sementes de cinco híbridos comerciais de milho (AG-9010, BALU-184, AS-32, CD-304 e FORT), as quais foram tratadas com Stimulus PG. (200 g para cada 100 kg de sementes). O experimento foi instalado no delineamento em blocos completos casualizados, com 4repeti es e 2 tratamentos arranjados no esquema de parcelas subdivididas, em que as sementes tratadas e n o-tratadas constituíram as subparcelas e os híbridos de milho, as parcelas. Por meio do rendimento das sementes nas unidades experimentais, foram calculadas as produtividades em kg ha-1 e a massa de mil sementes. A qualidade fisiológica das sementes foi avaliada por meio dos testes de germina o (primeira contagem e contagem final), envelhecimento acelerado, frio modificado e condutividade elétrica. Por meio dos resultados obtidos, verificou-se que n o houve efeito significativodo tratamento com micronutrientes na produtividade e na massa de mil sementes de todos os híbridos testados. No entanto, houve aumento na germina o e no vigor das sementes produzidas nas subparcelas que receberam tratamento de sementes com micronutrientes, sendo estes resultados variáveis em fun o do híbrido avaliado e do teste empregado. The use of micronutrients in order to increase yield has shown significant results, mainly in regions which adopt high levels of technology and management on cultures. Thus, the experiment was carried out aiming to verify the effects of the application of the fertilizer Stimulus PG. (20.0% of Zn; 3.0% of B; 1% of Mg and 1.0% of Mo), via seed treatment, on the yield and physiological quality of corn seeds grown in the late season crop (fall/winter). Seeds of fivecommercial corn hybrids were used (AG-9010, BALU-184, AS-32, CD-304 and FORT) and treated with Stimulus PG. (200g dose for each 100 kg seeds) before sowing. The experiment was set in a randomized complete block design containing four repetitions and two treatments arranged in sublots. The treated and non-treated seeds constituted the sublots and the corn hybrids, the plots. The productivity (given by kg ha-1 and the weigh of 1000 seeds) was calcula
Testes de laboratório em sementes de canola e a correla??o com a emergência das plantulas em campo
ávila, Marizangela Rizzatti;Braccini, Alessandro de Lucca e;Scapim, Carlos Alberto;Martorelli, Danilo Takara;Albrecht, Leandro Paiola;
Revista Brasileira de Sementes , 2005, DOI: 10.1590/S0101-31222005000100008
Abstract: the establishment of patterns for the evaluation of canola physiological seed quality is extremely useful for obtaining a good stand in the field. thus, with the objective of comparing the efficiency of different tests for the evaluation of canola physiological seed quality and to verify their relationships with seedling emergence in the field, four seed lots of canola were evaluated by the standard germination test, first count germination, electrical conductivity, accelerated aging, modified cold test, seedling emergence on sand seedbed, speed of emergence seedbed and speed of emergence-index in sand, seedling emergence in field, weight of a thousand seeds and the health test. among the tests carried out in the laboratory, the germination test and first counting of the germination, electrical conductivity and accelerated aging are considered the most efficient to differentiate field emergence performance of canola seed lots. the speed of emergence-index and the speed of emergence in sand seedbed are not suitable to evaluate canola seed quality.
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.
Efeito de diferentes coberturas vegetais e sistemas de preparo do solo na produ o da cultura da soja = Effect of different vegetal coverings and soil tillage systems on soybean crop production
Reny Adilmar Prestes Lopes,Raimundo Pinheiro Neto,Alessandro de Lucca e Braccini,Eduardo Godoy de Souza
Acta Scientiarum : Agronomy , 2007,
Abstract: Este trabalho avaliou o desempenho da soja sob a influência de cobertura vegetal e de manejo do solo em um Latossolo Vermelho distrófico. Utilizaram-se aveia, nabo, ervilhaca, ervilha, milheto e tremo o. Avaliaram-se altura e densidade de plantas, altura de inser o de vagens, número de vagens, produtividade, massa de mil gr os, teor de água, densidade e resistência do solo à penetra o. O sistema semeadura direta teve maior altura de inser o de vagens, quantidade de vagens, altura de plantas, teor de água e densidade do solo. Maiores valores de resistência do solo à penetra o foram verificados no preparo convencional, porém obteve-se maior produtividade. As coberturas e os sistemas de preparo influenciaram na produtividade das plantas de soja. As coberturas vegetaispromoveram melhorias no solo com redu o da compacta o em algumas camadas do solo. O consórcio aveia/ervilhaca mostrou-se uma técnica de manejo inadequada para as condi es às quais o solo foi submetido. O consórcio aveia/milheto mostrou ser uma op o viável de cobertura de solo antecessora à soja. A semeadura direta mostrou ser técnica demanejo adequado para o tipo de solo estudado. This study evaluated the performance of the soybean under the influence of vegetal covering and soil management in Red Latosol dystrofic. Oats, turnip, hairy vetch, pea, millet and lupine were used. The study evaluated height and density of plants, height of insertion in string beans, number of string beans, productivity, athousand grain mass, water contend, bulk density and soil resistance to penetration. The no-tillage system had greater height of insertion of string beans, amount of string beans, height of plants, water contend and soil bulk density. Greater values of soil resistance topenetration were verified in the tillage, though higher productivity was observed. The coverings and the soil tillage systems influenced the productivity of soybean plants. The vegetal coverings promoted improvement of the ground with reduction of the compactationin some layers of the soil. The oats/millet association is a viable option of soil covering predecessor of soybean. The no-tillage practice showed to be the adequate management technique for the type of soil studied.
Sowing seasons and quality of soybean seeds
ávila Marizangela Rizzatti,Braccini Alessandro de Lucca e,Motta Ivo de,Scapim Carlos Alberto
Scientia Agricola , 2003,
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.
Avalia??o de linhagens de cafeeiros quanto à tolerancia ao alumínio pelo método do papel-solu??o
BRACCINI, MARIA DO CARMO LANA;MARTINEZ, HERMINIA EMILIA PRIETO;BRACCINI, ALESSANDRO DE LUCCA E;
Bragantia , 2000, DOI: 10.1590/S0006-87052000000200014
Abstract: two experimental trials have been carried out in germination chambers to check, at the seedling stage, coffee plant reaction to the presence of aluminum; the first has been set up to determine the al concentration that would best differentiate the genotypes under study while, in the second, twenty-six genetic materials have been tested at the al concentration previously defined, as to their reactions to the stress. in the first experiment, seeds of two genotypes (ufv 2237 and ufv 3880) were germinated in the presence of increasing al levels (0, 25, 35 and 65 mg.l-1), using the solution-paper method, and lengths of primary roots measured after 40 days. the best differentiation was achieved at 35 mg.l-1 al concentration, in which ufv 2237 revealed to be more sensitive than ufv 3880. in the second, also using the solution-paper method and a 45 mg.l-1 aluminum level, lengths of primary roots were measured after 42 days. the results allowed the classification of the twenty-six coffee genotypes into four different groups, based on primary root length percentage reductions, through al reaction comparisons, for each genotype, in the presence and absence of stress. the high genetic diversity present strongly indicates the future success, in the selection for this character, in plant breeding programs.
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.
Morfo-anatomia do fruto e semente de amarelinho (Tecoma stans (L.) Kunth - Bignoniaceae)
Renó, Laércio Ribeiro;Moscheta, Ismar Sebasti?o;Braccini, Alessandro de Lucca e;
Revista Brasileira de Sementes , 2007, DOI: 10.1590/S0101-31222007000300003
Abstract: the little knowledge on the biology of the species tecoma stans (l.) kunth (bignoniaceae), known by its yellow trumpet flower and the importance that the same is acquiring mainly because of its aggressive characteristic have motivated the present work. anatomical aspects of the fruit and seed can be used in taxonomy, as well as in studies related to the ecology of the species. the objective was to describe and to illustrate the morphology and anatomy of the fruit and seeds of the trumpet flower. fruits from different plants were collected in the municipal districts of jacarezinho and maringá, north of the state of paraná. permanent and semipermanent slides were made. the morphological and anatomical analyses allowed the following observations: dry fruit, dehiscent, of the loculicidal capsule type; 2-carpel and 2-locular ovary with a longitudinal medium septa and anatropous and unitegmy ovules; line of dehiscence present since the beginning of the fruit development, when the continuous layer of fibers is interrupted by a strip of parenchyma cells; winged seed, not albuminous, with coriaceous wrapper that covers the embryo. this is straight, with short hypocotyl-radicular axis and no evident plumule. the wing of the seed is membranous and hyaline.
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