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Search Results: 1 - 10 of 2149 matches for " Silvio Moure; "
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X-Ray analysis to assess mechanical damage in sweet corn seeds
Gomes Junior, Francisco Guilhien;Cicero, Silvio Moure;
Revista Brasileira de Sementes , 2012, DOI: 10.1590/S0101-31222012000100010
Abstract: the x-ray test is a precise, fast and non-destructive method to detect mechanical damage in seeds. in the present study, the efficiency of x-ray analysis in identifying the extent of mechanical damage in sweet corn seeds and its relationship with germination and vigor was evaluated. hybrid 'swb 551' (sh2) seeds with round (r) and flat (f) shapes were classified as large (l), medium (m1, m2 and m3) and small (s), using sieves with round and oblong screens. after artificial exposure to different levels of damage (0, 1, 3, 5 and 7 impacts), seeds were x-rayed (15 kv, 5 min) and submitted to germination (25 °c/5 days) and cold (10 °c/7 days) tests. digital images of normal and abnormal seedlings and ungerminated seeds from germination and cold tests were jointly analyzed with the seed x-ray images. results showed that damage affecting the embryonic axis resulted in abnormal seedlings or dead seeds in the germination and cold tests. the x-ray analysis is efficient for identifying mechanical damage in sweet corn seeds, allowing damage severity to be associated with losses in germination and vigor.
Análise de imagens na avalia??o da qualidade de sementes de milho localizadas em diferentes posi??es na espiga
Mondo, Vitor Henrique Vaz;Cicero, Silvio Moure;
Revista Brasileira de Sementes , 2005, DOI: 10.1590/S0101-31222005000100002
Abstract: the possibility of using the image analysis technique for assessing the quality of seeds is very promising, it is a precision method that enables one to examine in detail the damaged or altered region, its location and extent. as it is a non-destructive method, the seeds being analyzed can be submitted to physiologic tests and thus, allow the relations of cause and effect to be established. thus, the objective of this research was to study the effects of the positions of maize seeds on ears on quality, using the image analysis technique. for this purpose, ears of the cultivar dkb 212 were shelled so that the seeds from the proximal, intermediate and distal positions could be isolated. the seeds coming from the referred positions were physically characterized and assessed with regard to vigor and sanitary condition. simultaneously, the seeds were radiographed, photographed (ventral and dorsal faces) and destined for germination first count test; the normal and abnormal seedlings and dead seeds were also photographed. all the images obtained were made available on the computer in such a way that they could be examined simultaneously and thus make a complete diagnosis for each seed. the determinations performed indicated that the seeds in the proximal and intermediate positions presented a similar quality and were superior to those of the distal position; spherical seeds with embryonic axes presenting torsions, but that were not altered, were not of a reduced quality, however, the alterations in the embryonic axes (dark, undefined stains), present in a larger quantity in the distal region of the ear, were responsible for the loss of seed quality.
Avalia??o do relacionamento entre danos mecanicos e vigor, em sementes de milho, por meio da análise de imagens
Cicero, Silvio Moure;Banzatto Junior, Hodair Luiz;
Revista Brasileira de Sementes , 2003, DOI: 10.1590/S0101-31222003000100006
Abstract: image analysis is a very promising technique to determine mechanical damage in seeds. this precise method examines seeds individually using enlarged images in which damaged areas as well as their exact location and extension can be found and examined in detail. since this is a non-destructive method, analyzed seeds can be submitted to physiological tests to establish the relationship between mechanical damage and quality loss. the objective of the present investigation was to study the effects of mechanical damage on corn/maize seed vigor using image analysis. fifty seeds from co 32, ag 6690 and attack cultivars were visually selected to form a sample of whole seeds with varying degrees of mechanical damage. the seeds were x-rayed, photographed (ventral and dorsal sides) and submitted to a cold test. photographs were repeated after the cold test. images were transferred to a computer so that pre and post cold test images could be examined simultaneously on the monitor to determine the possible relationship between cause and effect. results indicated that the method under study permits association of mechanical damage with eventual losses caused to corn/maize seed vigor.
Qualidades física e fisiológica de sementes de amendoim submetidas a doses de gesso agrícola combinadas a épocas e modos de aplica??o: II. área sem calagem
Spinola, Maria Cristina Mingues;Cicero, Silvio Moure;
Revista Brasileira de Sementes , 2002, DOI: 10.1590/S0101-31222002000100032
Abstract: this work was carried out with peanut seeds, cv.'tatu', in a randomized block design with three replications with aimed in the evaluate physical and physiological qualities of peanut seed from plants cultivated with various phosphogypsum sources, combined with application time and method no limed area. the treatments were of phosphogypsum rates (zero, 400, 800, 1200kg/ha), application times at sowing or flowering and application method (total area or in furrows). sowing fertilization consisted of phosphorus (80kg/ha of p2o5) and potassium (30kg/ha of k2o). seed quality was evaluated by weight of 100 seeds, germination, vigor (first germination counting, accelerated aging, eletric conductivity and field seedling emergence) tests and evaluation of macronutrient levels in seeds. phosphogypsum, independently of rate, application time and application method, was benefical for the seed quality. the phosphogypsum application at total area was uppermost benefical for the seed quality at application in furrows. the phosphogypsum sources in function application method influence the seed content of n, k and mg. the fertilization with p and k highed the seed contents of n and p.
Caracteriza??o morfológica de embri?es por imagens de raios x e rela??o com a massa e a qualidade fisiológica de sementes de Tecoma stans L. Juss. ex Kunth (Bignoniaceae)
Socolowski, Fábio;Cicero, Silvio Moure;
Revista Brasileira de Sementes , 2008, DOI: 10.1590/S0101-31222008000200025
Abstract: the images obtained by x-ray have been used to analyze seed quality since the 1950s and recently have gained prominence because it is a fast, accurate and non-destructive method. thus the objective of this study was to evaluate the morphological characteristics of the embryo structure of tecoma stans l. juss. ex kunth seeds with different mass, making use of x-ray images and correlating these images with seed germination and seedling morphological aspects. to obtain embryo images, seven classes of seed mass were used with thirty seeds in each class that were x-rayed . the embryos of each class of seed mass were separated according to their morphological characteristics in four categories (embryos without defect, embryos with small defect, deformed embryos and seeds without embryo). the seeds were placed to germinate (radicle protrusion) and after ten days the normal seedling number was observed in each class of seed mass. most of the seeds in the 1st and 2nd classes of seed mass, that were lighter, had seeds with embryo deformity or seeds without embryo. almost all or all the seeds with the highest mass (classes 3rd to 7th) had seeds with embryos without defect. almost all the seeds with embryos without defect germinated, buts not all gave origin to normal seedlings.
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.
Sensitivity of seed to desiccation in cupuassu (Theobroma grandiflorum (Willd. ex Spreng.) K. Schum. - sterculiaceae
Cruz, Eniel David;Cicero, Silvio Moure;
Scientia Agricola , 2008, DOI: 10.1590/S0103-90162008000500017
Abstract: the response of seeds to reduction in moisture content will determine whether they can be stored by conventional methods. the objective of this study was to verify the effect of desiccation on the germination and vigor of cupuassu (theobroma grandiflorum (willd. ex spreng.) k. schum.) seeds, a tropical fruit species. the following seed moisture contents (smc) were tested: 57.1%, 53.7%, 49.8%, 46.5%, 41.4%, 35.4%, 28.3%, 23.2%, 17.4%, 15.5% and 14.6%. desiccation of seeds to as low as 41.4% (smc) did not affect emergence, germination or vigor. however, reductions in speed of emergence were observed below 41.4%. when smc was equal or lower than 35.4% a reduction in seed quality was observed. loss of seed quality was increased when moisture content was equal or lower than 28.3%, and at 14.5% smc all cupuassu seeds were dead. the observed sensitivity of cupuassu seeds to reductions in moisture content suggests that storage conditions maintaining smc higher than 41% are necessary for good seed vigor of this species.
Teste de frio na avalia??o do vigor de sementes de feij?o
Miguel, Marcelo Hissnauer;Cicero, Silvio Moure;
Scientia Agricola , 1999, DOI: 10.1590/S0103-90161999000500027
Abstract: to assess the efficiency of cold test for bean seed vigor determination, two cultivars were evaluated by three different methodologies under two temperatures (10oc and 15oc) and three cold period (3, 5 and 7 days) regimes. the results were compared to the routine seed quality tests, such as the standard germination test, first germination count, accelerated aging, electrical conductivity and emergence in the field. tests were conducted in two seasons, four months apart. the results obtained using the various assays were compared by tukey's test. correlation analysis between the cold test methods and other vigor tests were carried out. paper rolls without soil for a period of three to five days at 10oc and 15oc correlated better with the standard vigor tests, especially the first germination count and field emergence. to assess the efficiency of cold test for bean seed vigor determination, two cultivars were evaluated by three different methodologies under two temperatures (10oc and 15oc) and three cold period (3, 5 and 7 days) regimes. the results were compared to the routine seed quality tests, such as the standard germination test, first germination count, accelerated aging, electrical conductivity and emergence in the field. tests were conducted in two seasons, four months apart. the results obtained using the various assays were compared by tukey's test. correlation analysis between the cold test methods and other vigor tests were carried out. paper rolls without soil for a period of three to five days at 10oc and 15oc correlated better with the standard vigor tests, especially the first germination count and field emergence.
Teste de frio na avalia o do vigor de sementes de feij o
Miguel Marcelo Hissnauer,Cicero Silvio Moure
Scientia Agricola , 1999,
Abstract: O presente trabalho teve como objetivo estudar o comportamento de sementes de feij o submetidas a diferentes metodologias do teste de frio, comparativamente a outros testes de vigor tradicionalmente utilizados na avalia o da qualidade fisiológica dessas sementes. As metodologias do teste de frio utilizadas foram: caixa plástica com terra, rolo de papel com terra e rolo de papel sem terra, nas temperaturas de 10oC e de 15oC e períodos de exposi o, de três, cinco e sete dias. Paralelamente foram conduzidos teste padr o de germina o, primeira contagem de germina o, envelhecimento acelerado, condutividade elétrica e emergência de plantulas em campo. As diferentes metodologias do teste de frio foram comparadas pelo teste de Tukey e, posteriormente, foram estabelecidas correla es com os demais testes de vigor. A análise dos dados e a interpreta o dos resultados permitiram concluir que a metodologia do rolo de papel sem terra, nos períodos de três e cinco dias à 10oC e à 15oC, proporcionou melhor correla o com a primeira contagem de germina o e emergência de plantulas em campo.
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.
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