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Search Results: 1 - 10 of 162501 matches for " Jo?o Almir;Silva "
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Peliculiza??o e tratamento químico de sementes de algodoeiro (Gossypium hirsutum L.)
Lima, Liana Baptista de;Silva, Priscila Alves da;Guimar?es, Renato Mendes;Oliveira, Joo Almir;
Ciência e Agrotecnologia , 2006, DOI: 10.1590/S1413-70542006000600007
Abstract: physiological and healthy quality of cotton seeds (gossypium hirsutum l.) are decisive factor to establish an ideal stand in the field. the chemical seed treatment is necessary to preserve the healthy quality and to obtain a better development performance of the seeds in the field. actually, researches on chemical treatment are liberally conducted, which film-coating technique has been used to get better adherence of these chemical products on the seeds. in this study, the physiological and healthy quality of two seed lots of delta opal and two seeds lots of sure grow, chemically treated and covered with 2 types of commercial films, ag201 and tgbp1080, were evaluated. the cotton seeds were treated with a mixture of the fungicides carboxin+thiram and the insecticide imidacloprid, in dosages of 2,5ml/kg+2,5ml/kg and 5ml/kg+5ml/kg. in both treatments, with 2ml/kg of the films were added. the treatments were evaluated by germination test, emergence test, speed of emergence, cold test and seed healthy test. the treatment of 5ml/kg of the fungicides (carboxin + thiran and insecticide (imidaclopride) was efficient in controlling fungus on the seeds. the film-coating does not allow to reduce the dosage in chemical treatment of seeds and also does not affect the germination, the emergence and the speed of emergence in high quality seeds.
Sweet pepper seed responses to inoculation with microorganisms and coating with micronutrients, aminoacids and plant growth regulators
Diniz, Kênia Almeida;Silva, Paulo de Albuquerque;Oliveira, Joo Almir;Evangelista, José Renato Emiliorelli;
Scientia Agricola , 2009, DOI: 10.1590/S0103-90162009000300002
Abstract: small sized seeds, such as the horticultural species, have limited quantities of reserves that can be balanced by coating then with essential nutrients for their initial development. in addition, inoculation of the seeds with microorganisms may protect the plants against phytopathogens, thus enhancing their growth. the present work had the objective of evaluate the physiological quality and seedling development of sweet pepper seeds and seedlings coated with several kind of films. seeds were first coated with polymers and then with antagonistic microorganisms (trichoderma viride, trichoderma polysporhum, trichoderma stromaticum, beauveria bassiana, metarhizium anisopliae), mycorrhizas, aminoacids, micronutrients and plant growth regulators. evaluation was performed for percentage of germination and for seedling emergence, speed of emergence index, number of plants, dry mass of the aerial and root parts and height of the seedlings. inoculation with trichoderma viride increased the percentage and rate of the seedlings emergence inoculation with trichoderma viride, metarhizium anisopliae and mycorrhizas promote better seedling development; seed microbiolization with microorganisms trichoderma viride, t. polysporhum, t. stromaticum, beauveria bassiana, metarhizium anisopliae. mycorrhizas mixture negatively affected seeds and seedling quality. seed covering with plant growht regulator, at a 5 ml kg-1 dose increased the roots dry matter.
Germina o e vigor de tanchagem e de melissa
Renata da Silva Brant,Carlos Juliano Brant Albuquerque,Joo Almir Oliveira,Carlos Machado Santos
Pesquisa Aplicada & Agrotecnologia , 2010, DOI: 10.5777/450
Abstract: El primer ensayo se realizó para evaluar la mejor sustancia para la germinación de Plantago lanceolata Hook. en una incubadora. Se utilizó remojar las semillas en las siguientes soluciones de ácido giberélico: 0,01% y 0,02% de tiuram a 0,01% y 0.02%, y de nitrato de potasio a 0,2% y 0,4%, con total de siete tratamientos considerando el testimonio y con cuatro repeticiones, en DIC. Estos se pusieron a germinar en la incubadora a una temperatura constante de 20 °C. Hubo lecturas diarias durante 21 días. El peso de 1000 semilla fue 2.085 gramos. El ácido giberélico causó el mayor incremento en IVG hasta 15 días. Los valores más altos de porcentaje de germinación a siete días se registraron en las semillas tratadas con ácido giberélico y a los 21 días no hubo diferencias entre el control, el ácido giberélico (0,01% y 0,02%), el tiuram (0,01%) y nitrato de potasio (0,2%). El segundo experimento tuvo como objetivo evaluar el efecto de la temperatura y GA3 sobre la germinación y el vigor de Melissa officinalis L. Fueran evaluadas cinco temperaturas (15, 20, 25, 30 o C y alterna 20-30 °C) en presencia y ausencia deGA3. Los experimentos se realizaron en “gerbox” en papel blot bosque húmedo. Los recuentos se realizaron durante diez días. Se utilizó DIC en dise o factorial 5x2 con cuatro repeticiones y 50 semillas por tratamiento. No hubo diferencias en las respuestas de IVG y el primer conteo de la germinación de la melissa entre las temperaturas. Posteriormente, la presencia de GA3 aumento lo IVG de las semillas. The first work was executed with the objective to evaluate the better solution in the Plantago lanceolata Hook. germination. The seeds were soaked with gibberelic acid (0.01% and 0.02%), thiourea (0.01% and 0.02%) and potassium nitrate (0.2% and 0.4%), plus a control treatment with 4 repetitions, disposed in CRD. The experiments were conduced on gerbox with a constant temperature of 20oC. The evaluations were done every day until 21 days. The 1,000 seeds weight was 2.085 grams. The gibberellic acid provided the higher increase of GSI until 15 days. The higher values for germination percentage at seven days were verified in seeds soaked with gibberellic acid in two concentrations and at 21 days there were no differences between the best treatments: control, gibberellic acid (0.01% and 0.02%), thiourea (0.01%) and potassium nitrate (0.2%). In the second experiment, the objective was to evaluate the effects of the temperature and GA3 on germination and vigor of Melissa officinalis L. seeds. It was tested five temperatures (15, 20, 25, 30oC and alternate 20-
Desempenho de sementes de piment?o revestidas com diferentes materiais
Oliveira, Joo Almir;Pereira, Carlos Eduardo;Guimar?es, Renato Mendes;Vieira, Antonio Rodrigues;Silva, Joo Bosco Carvalho da;
Revista Brasileira de Sementes , 2003, DOI: 10.1590/S0101-31222003000400006
Abstract: the technique of covering seeds has been used mainly for the species which have small seeds, such as vegetables, forage, forest and ornamental species, because besides increasing the size of the seeds for direct sowing, it is possible to add other elements which are necessary for the good development of the plant in its early stages. in this context the objective of the present study was to covered green-pepper seeds in different types of materials and to evaluate their behavior during storage. seeds treated and not treated with rovrin at the dosage of 200g/100kg were submitted to pre-conditioning for the imbibing of seeds in kno3 in -1,1mpa solution, in an aired system for 5 days. after drying the seeds were covered in a mixture of sand + microcellulose and another of limestone + microcellulose. the covered seeds and those not covered were dried and packed in paper envelopes (permeable pack) and in aluminum envelopes (impermeable pack) and stored at room temperature in the seeds analysis laboratory at ufla. the seed quality was evaluated once every four months, for a period of 20 months, using the following parameters: water content, germination test, accelerated aging, controlled deterioration and emergency in soil + sand. from the results, it was possible to conclude that the covering of seeds slows but does not affect the germination rate of the green pepper seeds before storage, but the covered seeds deteriorate faster than the seeds not covered, when stored in permeable packs. the nature of the materials used did not affect the quality of the green pepper seeds stored in impermeable packs.
Efeito de diferentes materiais de peletiza??o na deteriora??o de sementes de tomate durante o armazenamento
Oliveira, Joo Almir;Pereira, Carlos Eduardo;Guimar?es, Renato Mendes;Vieira, Antonio Rodrigues;Silva, Joo Bosco Carvalho da;
Revista Brasileira de Sementes , 2003, DOI: 10.1590/S0101-31222003000400004
Abstract: the pelleting of vegetable seeds is a very common technique, mainly for the species which have small seeds. one of its functions is to increase the seed size for direct sowing. the present study verified the pelleting of tomato seeds with different types of materials and to evaluated the performance during seed storage. the materials used as pelleting coats were sand + microcellulose and limestone + microcellulose, with and without rovrin fungicide (200g/100kg of seeds). raw seeds were covered, and treated with or without fungicides. then, seeds were dried and put in paper envelopes (permeable) and in aluminum foil (impermeable) and stored at room temperature at the universidade federal de lavras seed lab. the evaluation of seed quality was done once every four months, for 24 months, using the following determinations: germination test, accelerated aging and emergence on soil + sand. covered seeds presented slower germinatnion than the raw seeds. seeds covered with limestone + microcellulose deteriorated faster than the ones with sand + microcellulose and seeds treated with fungicides in association with the pelletting materials lost their quality faster during the storage. seeds covered with sand + microcellulose and without fungicide maintained their quality for the 24 months of storage, regardless of the packing used.
Análise fisiológica e ultra-estrutural durante o desenvolvimento e a secagem de sementes de soja
Silva, Paulo de Albuquerque;Diniz, Kênia Almeida;Oliveira, Joo Almir;Pinho, édila Vilela de Rezende Von;
Revista Brasileira de Sementes , 2007, DOI: 10.1590/S0101-31222007000200003
Abstract: during development and drying, a number of protection mechanisms act on the maintenance of seed physiological quality. some of these mechanisms maintain the integrity of the cells, which is fundamental to the perfect functioning of cell metabolism. the study of the ultra-structure enables visualization of damage caused by drying in the absence of protection mechanisms. in this research, damage occurred during the soybean seed development and drying was studied by means of scanning electron microscopy (sem). in addition, seeds were also evaluated regarding the physiological quality. thus, seeds in different developmental stages were collected and submitted to different drying temperatures and treatments. evaluations were made concerning the seed physiological quality by means of the germination test, cold test, emergence test under controlled conditions and electrical conductivity test. the damages were visualized by means of scanning electron microscopy utilizing the leo evo40 microscope. the results showed that the soybean seeds become desiccation tolerant when they possess around 30% water content. drying of seeds with moisture content above 30% caused reduction in cellular volume, disorganization of the cell walls and decrease in seed physiological quality. higher germination values were observed in seeds with 30% moisture content in the field, whereas higher values of vigor were observed in seeds with 40% of moisture content in the field.
Secagem e armazenamento de sementes de sorgo com alto e baixo teor de tanino
Oliveira, Joo Almir;Silva, Tanismare Tatiana de Almeida;Pinho, édila Vilela de Resende Von;Abreu, Luciana Aparecida de Souza;
Revista Brasileira de Sementes , 2011, DOI: 10.1590/S0101-31222011000400012
Abstract: water content in harvested seed and the drying temperature are fundamental for ensuring seed physiological quality, especially in sorghum, which may show secondary dormancy when dried at high temperatures. the objective of this study was to evaluate the physiological quality of sorghum seeds, with high and low tannin contents, stored after drying at different temperatures. seeds of the br 305(2.28 g tannin/100 g) and br 310 (0.52 g tannin/100 g) cultivars were collected with a water content of 18-20% and dried in the shade and in artificial dryers at temperatures of 35 °c, 45 °c and 35/45 °c until water content was 12%. after drying, the seeds were stored in a cold, dry chamber for 0, 3 and 6 months. for each storage period the seeds were evaluated with germination, tetrazolium, electric conductivity, emergence velocity index, cold, scanning electron microscopy and enzyme profile tests. tannin concentration was also measured. high tannin seeds showed 88.5% germination when dried at 45 °c and stored for 6 months. dormancy increased in both batches for seeds dried at 35 °c and with increased tannin concentration at six months storage.
Desempenho durante o armazenamento de sementes de pepino submetidas a diferentes métodos de secagem
Nakada, Pamela Gomes;Oliveira, Joo Almir;Melo, Larissa Correia de;Silva, Adriano Alves da;Silva, Priscila Alves da;Perina, Fabiano José;
Revista Brasileira de Sementes , 2010, DOI: 10.1590/S0101-31222010000300005
Abstract: the drying of seeds of cucumber is a compulsory stage in his improvement, as well as the storage to conquer competitive markets and better opportunities of prices. so the objective with this work valued the physiologic and biochemical performance during the drying and storage of seeds of cucumber. cultivating used was the hybrid of cucumber ?mega marketed by the agristar ltda. the seeds were washed and dried at room temperature 25 oc, 35 oc and 45 oc, following the storage in conditions ambient. the physiologic quality was valued through the germination test, first counting, conductivity electric and seedlings emergence. also there was done sanitary analysis, evaluation of the activity of enzymes from the superoxide dismutase, catalase, esterase, lipoxigenase, isocitrato liase and lea protein, and finally the analysis of images through ray x. the drying of seeds of cucumber, in ambient temperature, and to 35 oc turns in seeds of better quality. lea takes place reduction of the quality of the seeds and of the activity of the protein from six months of storage independent of the method of drying.
Polpa de caju em ra??es para frangos de corte na fase final: desempenho e características de carca?a
Ramos, Lidiana de Siqueira Nunes;Lopes, Joo Batista;Figueirêdo, Agustinho Valente de;Freitas, Almir Chalegre de;Farias, Leonardo Atta;Santos, Lucilene da Silva;Silva, Hunaldo Oliveira;
Revista Brasileira de Zootecnia , 2006, DOI: 10.1590/S1516-35982006000300024
Abstract: this research was developed to evaluate the performance, carcass characteristic and economical viability of broilers fed diets with increasing levels of dehydrated cashew pulp. three hundred and sixty ross breed broilers of both sexes averaging 22 days old were allotted to randomized blocks design with four treatments, constituted of dehydrated cashew pulp levels (0, 5, 10, and 15%) and five replications. at 42 days old, four birds (two males and two females) were slaughtered by weight and sex per experimental unit to evaluate the main carcass characteristics. the 15% level of dehydrated cashew pulp in the growing diets did not affect feed intake, weight gain and main carcass characteristics of broiler. no effects of increasing levels on feed gain ratio and economical analyses (gross revenue and average gross margin) were noticed. the use of dehydrated cashew pulp in the broiler diets depends on the diet prices.
Comportamento de seis variedades de pomelo (Citrus paradisi Macfad.) cultivadas sob irriga??o na regi?o semi-árida de Pernambuco
Lederman, Ildo Eliezer;Bezerra, Joo Emmanoel Fernandes;Alves, Marta Assun??o;Coelho, Ygor da Silva;Cunha Sobrinho, Almir Pinto da;
Revista Brasileira de Fruticultura , 2005, DOI: 10.1590/S0100-29452005000200015
Abstract: the use of irrigation at the semi-arid region of northeast brazil has made feasible several commercial fruit trees crops such as grapevines, mango, guava, coconut, banana and others, like grapefruit, which actually is being studied. a collection formed by six grapefruit varieties showing a pink-red pulp color (marsh foster, star ruby, rio red and red blush) and a creamy color (triumph and marsh foster nucelar) and consisting of five plants/plot was installed in 1993 at the ibimirim experimental station, located in the moxotó river valley at the semi-arid region of pernambuco - northeast brazil, under irrigation. evaluations carried out during three years (from 2000 to 2002) have shown high yield variability among the varieties; with 'star ruby' reaching an average of 31.0 kg/tree and 'nucelar marsh foster' yielding as much as 135,0 kg/tree. mean fruit weight also varied, from 285.5g (red blush) to 401.6g in 'triumph' variety. fruit composition and quality measured through the total soluble solids (tss), acidity (ta) and sst/ta ratio contents have shown high variations among grapefruit varieties studied.
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