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| Registros recuperados: 309 | |
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| Monteiro,Antonio Carlos; Barbosa,Claudio Camargo; Correia,Antônia do Carmo Barcelos; Pereira,Gener Tadeu. |
| O objetivo deste trabalho foi avaliar o crescimento e a esporulação de dois isolados (JAB 02 e JAB 45) de Verticillium lecanii (Zimm.) Viégas, submetidos a diferentes valores de pH (4, 5, 6, 7, 8, 9) inicial do meio de cultivo sólido, de temperatura (19, 22, 25, 28 e 31ºC) e fotoperíodo (0, 12 e 24 horas). Após 20 dias de cultivo, não se observou efeito do pH inicial do meio no crescimento e esporulação dos isolados, exceto no pH 4,0 que reduziu o crescimento. A ausência de iluminação proporcionou a melhor condição para o crescimento de JAB 02 (32,70 mm) e JAB 45 (32,67 mm). Não houve efeito do fotoperíodo na produção de esporos. As melhores temperaturas para o crescimento de JAB 02 foram 19, 22 e 25ºC e para JAB 45 foram 19 e 25ºC. Este último isolado... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Fungo entomopatogênico; PH; Temperatura; Fotoperíodo; Controle de pragas. |
| Ano: 2004 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-204X2004000600007 |
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| FUSCALDO,FEDERICO; BEDMAR,FRANCISCO; MONTERUBBIANESI,GLORIA. |
| An oat bioassay was conducted in pots under greenhouse conditions to determine the persistence of atrazine, metribuzin and simazine herbicides in soils of the southeast of Buenos Aires Province, Argentina. Atrazine rates of 0, 0.58, 1.16 and 2.32 mug g-1 of active ingredient (a.i.), metribuzin rates of 0, 0.14, 0.28 and 0.56 mug g-1 of a.i., and simazine rates of 0, 0.72, 1.45 and 2.9 mug g-1 of a.i. dry soil weight were applied to pots containing soils from Balcarce and San Cayetano sites. Organic matter (OM) content and pH of Balcarce soil were 5.5% and 5.8%, while for San Cayetano soil were 2.9% and 6.7%, respectively. Relative dry weight (RDW) of oat shoots was calculated as percentage of control. Considering a 20% RDW reduction of oat shoots,... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Oat; Organic matter; PH; Herbicide rates; Bioassay. |
| Ano: 1999 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-204X1999001100009 |
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| Ali,H.H.; Tanveer,A.; Nadeem,M.A.; Asghar,H.N.; Javaid,M.M.. |
| Rhynchosia capitata is becoming an increasing problem in summer crops, such as cotton, soybean, pearl millet and mungbean in many Asian countries. Laboratory and greenhouse studies have been conducted to determine the effects of several environmental factors on seed germination patterns and seedling emergence of R. capitata. We investigated whether the diverse ecological factors such as temperature, light, salinity, moisture stress, pH, and soil depth affected germination and seedling emergence of R. capitata. Germination increased as temperature increased from 25ºC and significantly reduced at 45ºC. Presence or absence of light did not influence germination. Germination of R. capitata was sensitive to increased salt and moisture stress, as well as to seed... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Moisture stress; PH; Salinity; Seedling emergence; Burial depth. |
| Ano: 2013 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-83582013000200002 |
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| Maciel,C.D.G.; Guerra,N.; Oliveira Neto,A.M.; Poletine,J.P.; Bastos,S.L.W.; Dias,N.M.S.. |
| Objetivou-se neste estudo avaliar a tensão superficial estática, o pH e a produção da espuma de misturas em tanque de glyphosate + chlorimuron-ethyl, associadas ou não com adjuvantes. Dois trabalhos foram realizados, sendo a primeira etapa desenvolvida em delineamento inteiramente casualizado com seis tratamentos e 20 repetições, representados por soluções dos herbicidas glyphosate (540,0 g e.a. ha-1) e chlorimuron-ethyl (7,5 g ha-1), isolados e em mistura em tanque nas formulações: Polaris®; Roundup Ready®; Classic®; Polaris® + Classic®; Roundup Ready® + Classic® e testemunha (água). Na segunda etapa foram estudados em DIC 70 tratamentos e 20 repetições, em fatorial 2 x 5 x 7, constituído por duas misturas de glyphosate com chlorimuron-ethyl (Polaris® +... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: PH; Espuma; Herbicida; Estabilidade. |
| Ano: 2010 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-83582010000300025 |
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| Ghaderi-Far,F; Gherekhloo,J.; Alimagham,M.. |
| Laboratory and greenhouse experiments were conducted to determine the effects of drought and salinity stress, temperature, pH and planting depth on yellow sweet clover (Melilotus officinalis) germination and emergence. Base, optimum and ceiling germination temperatures were estimated as 0, 18.47 and 34.60 ºC, respectively. Seed germination was sensitive to drought stress and completely inhibited at a potential of -1 MPa, but it was tolerant to salinity. Salinity stress up to 90 mM had no effect over the M. officinalis seed germination, but the germination decreased by increasing the salt concentration. The drought and salinity required for 50% inhibition of maximum germination were 207 mM and -0.49 MPa, respectively. High percentage of seed germination... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Germination; PH; Salinity stress; Soil depth; Temperature; Water stress. |
| Ano: 2010 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-83582010000300002 |
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| Yamashita,O.M.; Guimarães,S.C.; Silva,J.L.; Carvalho,M.A.C.; Camargo,M.F.. |
| O conhecimento de informações básicas sobre a biologia de plantas daninhas pode contribuir significativamente para o desenvolvimento de estratégias para seu manejo. Emilia sonchifolia é uma espécie de ampla disseminação em todo o território brasileiro e apresenta moderada agressividade, sendo encontrada em áreas agrícolas, terrenos baldios e áreas urbanas. O presente trabalho teve como objetivo avaliar a germinação das sementes de E. sonchifolia em diferentes condições ambientais. Foram realizados quatro experimentos: combinação de quatro temperaturas (20, 25, 30 e 35 ºC) em duas condições de luz (ausência e presença); sete níveis de restrição hídrica proporcionada por PEG6000 (0,0; -0,1; -0,2; -0,4; -0,6; -0,8; e -1,0 MPa); seis níveis de estresse salino... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Falsa-serralha; Temperatura; Restrição hídrica; Salinidade; PH. |
| Ano: 2009 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-83582009000400005 |
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| Souza Filho,Antonio P. S.; Dutra,Saturnino; Silva,Maria A. M. M.; Teixeira Neto,José F.. |
| As flutuações na germinação de sementes no campo são governadas por um conjunto de fatores ambientais. No presente trabalho são analisados os efeitos do pH, da salinidade e do alumínio sobre a germinação de sementes, e da profundidade de semeadura sobre a taxa de emergência de plântulas das invasoras de pastagens mata-pasto (Cassia tora) e malva (Urena lobata). À exceção dos estudos de profundidade de semeadura, que foram realizados em casa de vegetação, os demais foram realizados em laboratório. A germinação e a taxa de emergência de plântulas foram monitoradas em períodos de 15 e 20 dias, respectivamente. Os resultados obtidos mostraram que o pH na faixa de 3 a 11 e a concentração de alumínio de 0 a 2,0 meq/100 ml não afetaram a germinação das sementes... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: PH; Salinidade; Alumínio; Plantas daninhas; Pastagens. |
| Ano: 1998 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-83581998000100007 |
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| AAMIR,M.; KHAN,E.A.; BALOCH,M.S.; ASLAM,M.. |
| ABSTRACT: Lathyrus aphaca is an aggressive dicotyledonous weed. The effect of different agroecological components/factors on the germination ecology of this weed was explored under a glasshouse and laboratory condition in 2014. The germination response of L. aphaca was lower at high temperature while maximum seed germination was found at 15/12 oC (day/night). Light significantly stimulated L. aphaca germination; nevertheless, substantial germination occurred under dark conditions. More than 86-90% of L. aphaca seeds germinated at pH level of 6.2-7.5. A significant quantity of seed germinated at 250 mM NaCl. There was no germination at -1 MPa. When the temperature was lower than 20/15 oC (day/night) initiation time of germination and germination index (GI)... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Osmotic stress; Weed seeds; Salt stress; Temperature; PH; Light. |
| Ano: 2019 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-83582019000100253 |
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| Derakhshan,A.; Gherekhloo,J.. |
| Specific knowledge about the dormancy, germination, and emergence patterns of weed species aids the development of integrated management strategies. Laboratory studies were conducted to determine the effect of several environmental factors on seed germination and seedling emergence of Cyperus difformis. Germination of freshly harvested seeds was inhibited by darkness; however, when seeds were subsequently transferred to complete light they germinated readily. Our results showed that 2 wk of cold stratification overcome the light requirement for germination. Seeds of C. difformis were able to germinate over a broad range of temperatures (25/15, 30/20, 35/25, and 40/30 ºC day/night). The response of germination rate to temperature was described as a... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Osmotic potential; Salinity stress; PH; Soil depth; Temperature. |
| Ano: 2013 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-83582013000400008 |
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| Erasmo,Eduardo A. L.; Bianco,Silvano; Pitelli,Robinson A.; Berringeli,Paulo. |
| A distribuição e desenvolvimento de plantas, a exemplo daquelas que infestam as áreas agrícolas, é influenciada por diversos fatores, a como aqueles ligados às caraterísticas do solo, naturais ou impostas pelo homem. Assim, o presente trabalho de pesquisa foi desenvolvido em condições de casa-de-vegetação com o objetivo de estudar o efeito de níveis crescentes de calagem no crescimento e estado nutricional de Senna obtusifolia, planta daninha comum em ecossistemas agrícolas. O delineamento experimental adotado foi o inteiramente casualizado, com seis tratamentos e quatro repetições. Os tratamentos constituíram-se em quantidades de calcário dolomítico calcinado com 38% de CaO e 20% de MgO, com um poder de neutralização total (PRNT) de 104%: 0, 2, 4, 6, 8 e... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Calagem; Nutrição; PH; Senna obtusifolia. |
| Ano: 2000 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-83582000000200007 |
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| DADDARIO,J.F.F.; BENTIVEGNA,D.J.; TUCAT,G.; FERNÁNDEZ,O.A.. |
| ABSTRACT Common teasel is a widespread, invasive species that has been introduced in Buenos Aires province, Argentina, where it alters the species composition of protected areas and native grasslands. A better understanding of seed germination behavior is essential for predicting its invasion potential in new areas and would be useful for developing effective management strategies. This research, conducted under laboratory conditions, evaluated the influence of several environmental factors such as pH, constant temperature, osmotic stress, salt stress and dry storage, on germination and rate of germination of common teasel seed. Between-year variation in germination responses was also examined. Seed germination was not affected by different pH levels.... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Invasive weed; Dry storage; Osmotic stress; PH; Salt concentration; Temperature. |
| Ano: 2017 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-83582017000100263 |
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| Sadeghloo,A.; Asghari,J.; Ghaderi-Far,F.. |
| Abutilon theophrasti and Barnyardgrass (Echinochloa crus-galli) are major weeds that affect cropping systems worldwide. Laboratory and greenhouse studies were conducted to determine the effects of temperature, pH, water and salinity stress, and planting depth on seed germination and seedling emergence of Velvetleaf and Barnyardgrass. For Velvetleaf, the base, optimum and ceiling germination temperatures were estimated as 5, 35 and 48 ºC, respectively. Seed germination was sensitive to drought stress and completely inhibited by a potential of -0.6 MPa, but it was tolerant to salinity. Salinity stress up to 45 mM had no effect on the germination of Velvetleaf, but germination decreased with increasing salt concentration. Drought and salinity levels for 50%... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: PH; Planting depth; Seed germination; Temperature; Weed. |
| Ano: 2013 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-83582013000200003 |
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| Komiyama,CM; Mendes,AA; Takahashi,SE; Moreira,J; Garcia,RG; Sanfelice,C; Borba,HS; Leonel,FR; Almeida Paz,ICL; Balog,A. |
| This study aimed at evaluating the effect of different fasting periods and water spray during lairage on the quality of chicken meat. A number of 300 male Ross broilers were reared up to 42 days of age, and submitted to four pre-slaughter fasting periods (4, 8, 12, and 16 hours) and sprayed with water or not during lairage. Deboned breast meat was submitted to the following analysis: pH, color, drip loss, water retention capacity, cooking loss, and shear force. There was a significant effect (p < 0.05) of fasting period on meat luminosity was significantly different, with the highest value obtained for 4-hour fasting, whereas no difference was found among the other fasting periods. Meat pH values were different among fasting periods when birds received... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Broilers; Color; Meat; PH. |
| Ano: 2008 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-635X2008000300008 |
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| Queiroz,FA de; Carvalho,MM de; Sugui,JK; Nunes,J; Felipe,L; Santos,EC dos; Tonhati,H; Boiago,MM; Hata,ME; Tholon,P; Queiroz,SA de. |
| Tinamou (Rhynchotus rufescens) is a native bird of the Brazilian fauna and has great potential to become a domesticated species. From this perspective, the objective of this study was to evaluate the carcass and main parts yield and to assess meat quality of that bird. Two trials, one studying stocking density and the other litter materials, lasting 60 days each, were conducted. The studied traits were evaluated in two birds/replicate/treatment. Performance was evaluated by the least square method. The results showed that bird age at slaughter significantly influenced carcass and breast yields (p<0.05). Mean carcass, breast, thighs+drumstick and wing yields were 86.50±2.78%, 32.84±1.50%, 27.71±1.44%, and 13.21±0.94%, respectively. Shear force, pH, water... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Carcass yield; Lightness; PH; Shear force; Water holding capacity. |
| Ano: 2013 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-635X2013000200006 |
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| Kralik,Z; Kralik,G; Grčević,M; Kralik,I; Gantner,V. |
| ABSTRACT The objective of this study was to compare the internal and external quality of conventional and designer eggs. In total, 120 Tetra SL laying hens were randomly allotted to two treatments (K and P groups), with 12 replicates of five hens each. The control group (K) was fed a standard layer diet, producing conventional eggs, and the P group was fed a modified diet supplemented with 5% of an oil mixture, 0.5 mg organic selenium/kg, 200 mg lutein/kg and 200 mg vitamin E/kg, producing designer eggs. Treatments did not influence (p>0.05) egg weight or egg component weights. Designer eggs presented higher albumen proportion and lower eggshell proportion than conventional eggs (p<0.01). Relative to egg quality parameters, designer eggs presented... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Designer eggs; Haugh units; Laying hens; PH; TBARS.. |
| Ano: 2018 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-635X2018000100119 |
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| Denadai,JC; Mendes,AA; Garcia,RG; Almeida,ICL; Moreira,J; Takita,TS; Pavan,AC; Garcia,EA. |
| O objetivo de estudo foi o de avaliar o efeito do jejum de ração e água antes do abate sobre o rendimento de carcaça e cortes, perda de peso vivo, conteúdo do papo, intestino e moela, matéria seca das fezes, bem como volume globular médio e proteína total plasmática do soro. Foram utilizados 600 pintos machos da linhagem Ross, criados até 42 dias de idade, quando foram submetidos a três períodos de jejum (zero, quatro ou oito horas). A duração do período de jejum afetou (p<0,05) a perda de peso vivo, o rendimento de carcaça, carne de pernas, pés, conteúdo do papo e intestino. Aumentando-se o período de jejum até 4 horas, aumentou-se a perda de peso vivo e o rendimento de carcaça e patas, mas diminuiu-se o rendimento de pernas e o conteúdo do papo e do... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Carcaça; Jejum; Maciez; Peito; PH. |
| Ano: 2002 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-635X2002000200002 |
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| Registros recuperados: 309 | |
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