oalib

Publish in OALib Journal

ISSN: 2333-9721

APC: Only $99

Submit

Any time

3 ( 1 )

2020 ( 18 )

2019 ( 123 )

2018 ( 185 )

Custom range...

Search Results: 1 - 10 of 105747 matches for " Barros Antonio Carlos Souza Albuquerque "
All listed articles are free for downloading (OA Articles)
Page 1 /105747
Display every page Item
Cálcio e silício na produ??o e qualidade de sementes de soja
Harter, Fabio Schaun;Barros, Antonio Carlos Souza Albuquerque;
Revista Brasileira de Sementes , 2011, DOI: 10.1590/S0101-31222011000100006
Abstract: the use of natural products in plant protection constitutes an important tool for the farmers to organic production. the study aimed to evaluate the efficiency of the calcium and silicon in the production and quality of soybean seeds. we used seeds of organic soybeans (glycine max l.) cultivar br36, from such cooperative in the 2004/2005 harvest. the experimental design used was randomized blocks with five treatments (calcium 40, calcium 50, silicon 40, silicon 50 and control). the treatments were compared by duncan test at 5% probability. the variables of yield components were: number of pods per plant, seed number per pod, productivity and yield. the physiological quality of seeds was determined by tests: germination, first count germination, cold test, electrical conductivity and accelerated aging. conclude that soybean plants treated with calcium and silicon produce seeds of higher physiological quality; treatments with application of ca and si reduce the seed yield per unit area.
A secagem de sementes
Garcia, Danton Camacho;Barros, Antonio Carlos Souza Albuquerque;Peske, Silmar Teichert;Menezes, Nilson Lemos de;
Ciência Rural , 2004, DOI: 10.1590/S0103-84782004000200045
Abstract: the drying operation of the seeds is fundamental in the production system because it reduces the tenor of water to allow its physiologic quality preservation during the storage and makes possible the anticipation of the crop avoiding losses of several cause. in the choice of the drying method, the amount seeds factor is limited and, when we need to dry larger amounts the use of artificial drying is indispensable, whose operation costs are related, mainly, with volume, drying speed and temperature of the air. it becomes important that the operators are aware of the drying conditions that they get to provide to the seeds, aiming to maximize the possible benefits or, on the other hand, to minimize to the maximum the inevitable and irreversible losses that happen from the moment that the seeds reach its maximum quality, still in the field.
Diferentes épocas de colheita e qualidade fisiológica de sementes de cevada
Tunes, Lilian Madruga de;Barros, Antonio Carlos Souza Albuquerque;Badinelli, Pablo Gerzson;Garcia, Danton Camacho;
Revista Brasileira de Sementes , 2010, DOI: 10.1590/S0101-31222010000200005
Abstract: the objective of this study was to evaluate the effect of different harvesting periods on the physiological quality of barley seeds. seeds of cultivars mn 721 and scarlett were used. the seeds were harvested at 118, 129 and 140 days after sowing. the humidity at the time of sampling was 25%, 18% and 13% in the first, second and third harvests respectively for the cultivar mn 721, and for the cultivar scarlett it was 26%, 19% and 13%, respectively for the same periods. the seeds were oven-dried by forced air circulation down to 13% moisture content and then stored in a cold room (t 17 oc and rh 45-50%). before analysis, the seed was subjected to pre-cooling of 5 to 10 oc for seven days to break dormancy. the seeds were evaluated by the standard germination tests, first count of germination, seedling length (shoot and root), dry weight (shoot and root), tetrazolium and accelerated ageing for each cultivar at the different harvest times after breaking dormancy. after harvesting, barley cultivars show a high level of dormancy. depending on the cultivar, dormancy is most pronounced when seeds are harvested with a humidity content around 13%. the barley seeds with better physiological quality were obtained with moisture contents of 26% (118 days after sowing) and 18% (129 days after sowing) for the scarlett and mn 721 cultivars, respectively.
Efeito da qualidade fisiológica das sementes e da densidade de semeadura sobre o rendimento de gr?os e qualidade industrial em arroz
H?fs, Alberto;Schuch, Luis Osmar Braga;Peske, Silmar Teichert;Barros, Antonio Carlos Souza Albuquerque;
Revista Brasileira de Sementes , 2004, DOI: 10.1590/S0101-31222004000200008
Abstract: an experiment was conducted in the centro agropecuário da palma, at the universidade federal de pelotas (cap/ufpel) with the objective of evaluating the effect of rice seed physiological quality and seeding rate upon grain yield and grain integrity percentage. it was tested in a factorial combination in two crop years (2000/2001 and 2001/2002), two physiological quality levels and different seeding rates. seed lots of the cultivar irga 417 were obtained from official seed growers of rio grande do sul state, brazil. seeding rates were 80, 140 and 200 kg per hectare in 2000/2001 and 80 and 150 kg in 2001/2002. the use of high physiological quality level seed lots propitiated yield increases of 8,2% and 9,0% in 2000/2001 and 2001/2002, corresponding to 622 kg ha-1 and 660 kg ha-1, respectivelly. otherwise, different seeding rates did not affect grain yield.the use of lots of low seed physiological quality caused uneven maturation, reduction in 1000 grain weight. on the other hand, grain integrity percentage and index of harvesting were not affected. the variation in the seeding rate did not affect maturation uniformity, grain integrity yield and weight of 1000 grains.
Reflexos do mecanismo de a??o de herbicidas na qualidade fisiológica de sementes e na atividade enzimática em plantulas de arroz
Machado, Rodrigo Ferreira;Barros, Antonio Carlos Souza Albuquerque;Zimmer, Paulo Dejalma;Amaral, Ademir dos Santos;
Revista Brasileira de Sementes , 2006, DOI: 10.1590/S0101-31222006000300022
Abstract: the present work had the objective of evaluating the residual effect of the herbicides in the physiologic quality and in the enzymatic activity in rice seeds. four herbicides were tested (clomazone, quinclorac, propanil, byspiribac-sodium) in two application times and four rice cultivars (arrank, brs-pelota, br-irga 410 and br-irga 417). to evaluate the physiologic quality of the seeds the germination test, cold test and electric conductivity were accomplished. for the enzymatic activity it was evaluated the following enzymes: esterase, glutamate oxaloacetate transaminase, malate dehydrogenase, glutamate dehydrogenase, phosphoglucose isomerase and the acid phosphatase. the herbicides of different mechanisms of action in post emergence application, can modify rice physiologic performance. the enzymatic expression varies as a function of the genotype and it is not dependent of the herbicide residual effect.
Emergência e crescimento de plantulas de arroz em resposta à qualidade fisiológica de sementes
H?fs, Alberto;Schuch, Luis Osmar Braga;Peske, Silmar Teichert;Barros, Antonio Carlos Souza Albuquerque;
Revista Brasileira de Sementes , 2004, DOI: 10.1590/S0101-31222004000100014
Abstract: this study was conducted in the experimental area of the plant pathology department of the agronomy faculty "eliseu maciel" of the federal university of pelotas, in 2001 and 2002 with the objective of evaluating the effect of using seeds with different vigor levels on emergence and initial seedling growth. seeds of two vigor levels were tested, and the higher vigor had more than 95% germination and the lower vigor level germination was between 80 and 85%. those lots were obtained from officially documented seed growers of rio grande do sul state, brazil. the use of low vigor seeds caused a reduction in field emergence, delayed and unequal emergence and continued to act after emergence on isolated plants, affecting biomass dry weight and foliar area. thus it was an advantage to use seeds of higher vigor level due to the production of plants with a big initial size, that consequently, propitiated bigger growth crop rate. differences in crop growth rate decreased during the growing period because of the bigger relative growing rate shown by plants from low vigor seeds, although there was no variation in the rate of liquid assimilation. this behavior led to a reduction in the initial differences of biomass yield by isolated plants of irrigated rice, derived from seeds of different vigor levels.
Qualidade fisiológica de sementes de urucum armazenadas em diferentes ambientes e embalagens
Corlett, Francisco Marinaldo Fernandes;Barros, Antonio Carlos Souza Albuquerque;Villela, Francisco Amaral;
Revista Brasileira de Sementes , 2007, DOI: 10.1590/S0101-31222007000200021
Abstract: urucum (bixa orellana l.) is a species of great commercial interest, from whose main product, the seed, is extracted the bixina and norbixina coloring, of great interest in national and international markets. the objective of this study was to evaluate urucum seed physiological quality of the cultivar bico de pato, stored for period of 12 months in four environments (environmental condition, cold chamber, refrigerator and freezer) and packed in bags (trifoliated envelopes of aluminum-polyethylene-paper, plastic packing in vacuum, black polyethylene). after moisture determination, the seeds were scarified mechanically. they were evaluated at 90, 180, 270, 360th days of storage and submitted to the germination, first counting of germination and germination speed index tests. it was possible to conclude that urucum seeds with 7,0% moisture, packed in vacuum maintained physiological quality for 270 days and that the storage in freezer and refrigerator, in aluminum and plastic bags in vacuum, provided better physiological seed quality.
Envelhecimento acelerado como teste de vigor para sementes de arroz
Tunes,Lilian Madruga de; Tavares,Lizandro Ciciliano; Barros,Antonio Carlos Souza Albuquerque;
Revista de Ciências Agrárias , 2012,
Abstract: the objectives of this study were to examine the methodology of the accelerated aging test and verify the possibility of using nacl as an option for control of water uptake by seeds during the test. five lots of seed were tested for germination (g), seedling emergence (se)??, index of emergence speed (ies) and accelerated aging (aa). the periods of exposure used were 24, 48, 72, 96 and 120h, with and without saline solution (nacl). the use of unsaturated and saturated solution of nacl decreased water uptake by rice seeds during accelerated aging. the use of these solutions decreased deterioration rate and the results were less drastic and more uniform. the periods of exposure of 48h with unsaturated solution and 24 with saturated nacl solution must be used because they promote a better stratification of seed lots of rice. accelerated aging is considered an excellent option as a vigor test when compared to seedling emergence and index of emergence speed because the shortest time of acquisition and efficient results.
Envelhecimento acelerado como teste de vigor para sementes de arroz Accelerated aging as test of vigor for rice seeds
Lilian Madruga de Tunes,Lizandro Ciciliano Tavares,Antonio Carlos Souza Albuquerque Barros
Revista de Ciências Agrárias , 2012,
Abstract: O presente trabalho teve por objetivo analisar a metodologia do teste de envelhecimento acelerado, bem como verificar a possibilidade do uso de Cloreto de Sódio (NaCl) como op o para controle da absor o de água pelas sementes durante a realiza o do teste. Foram utilizados cinco lotes de sementes, submetidos aos testes de germina o (G), emergência de plantulas (EP), índice de velocidade de emergência (IVE) e envelhecimento acelerado (EA), empregando-se os períodos de exposi o de 24, 48, 72, 96 e 120h, com e sem solu o salina (NaCl). A utiliza o de solu o n o saturada e saturada de NaCl diminui a absor o de água pelas sementes de arroz durante o teste de envelhecimento acelerado, acarretando uma menor taxa de deteriora o e resultados menos drásticos e mais uniformes. As op es 48h com solu o n o saturada (SNS) e 24h com solu o saturada de NaCl (SSS) devem ser utilizadas porque promovem uma melhor estratifica o dos lotes de sementes de arroz. O EA é considerado uma ótima op o como teste de vigor quando comparado a EP e IVE, pelo menor tempo de aquisi o e eficiência dos resultados. The objectives of this study were to examine the methodology of the accelerated aging test and verify the possibility of using NaCl as an option for control of water uptake by seeds during the test. Five lots of seed were tested for germination (G), seedling emergence (SE) , index of emergence speed (IES) and accelerated aging (AA). The periods of exposure used were 24, 48, 72, 96 and 120h, with and without saline solution (NaCl). The use of unsaturated and saturated solution of NaCl decreased water uptake by rice seeds during accelerated aging. The use of these solutions decreased deterioration rate and the results were less drastic and more uniform. The periods of exposure of 48h with unsaturated solution and 24 with saturated NaCl solution must be used because they promote a better stratification of seed lots of rice. Accelerated aging is considered an excellent option as a vigor test when compared to seedling emergence and index of emergence speed because the shortest time of acquisition and efficient results.
A secagem de sementes
Garcia Danton Camacho,Barros Antonio Carlos Souza Albuquerque,Peske Silmar Teichert,Menezes Nilson Lemos de
Ciência Rural , 2004,
Abstract: A opera o de secagem das sementes é fundamental no sistema de produ o, pois, além de reduzir o teor de água, para permitir a preserva o de sua qualidade fisiológica durante o armazenamento, possibilita a antecipa o da colheita evitando perdas de natureza diversa. Na escolha do método de secagem, o fator quantidade de sementes é limitante e, quando necessitamos secar grandes quantidades, é imprescindível a utiliza o de secagem artificial, cujos custos de opera o est o relacionados, principalmente, com volume, velocidade de secagem e temperatura do ar. Torna-se importante que os operadores tenham consciência das condi es de secagem que conseguem proporcionar às sementes, buscando maximizar os benefícios possíveis ou, por outro lado, minimizar ao máximo as inevitáveis e irreversíveis perdas que ocorrem a partir do momento que as sementes atingem sua máxima qualidade, ainda no campo.
Page 1 /105747
Display every page Item


Home
Copyright © 2008-2017 Open Access Library. All rights reserved.