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| Registros recuperados: 1.831 | |
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| Almeida,Dieimisson P.; Ferreira,Marcelo da C.; Santos,Renata T. da S.; Griesang,Fabiano; Santos,Eduardo de S. dos; Timossi,Paulo C.. |
| ABSTRACT The herbicide glyphosate is sprayed with varying application volumes that result in different concentrations used in the spray solutions. Thus, this study aimed to evaluate the effect of glyphosate concentrations on the potential risk of droplet drift, surface tension of spray solution, and contact angle of droplets on surfaces. Three experiments were conducted in a completely randomized design. Drift potential was evaluated by median volumetric diameter (MVD), percentage volume of droplets with diameter smaller than 100 μm (%V<100 μm), and coefficient of uniformity (Span), with 12 replications. The surface tension of spray solutions and contact angle of droplets were evaluated on Urochloa ruziziensis leaves, paraffin film, and glass, with four... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Surface tension; Contact angle; Droplets; MVD; Congo grass. |
| Ano: 2020 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-69162020000100069 |
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| Gandia,Rômulo M.; Gomes,Francisco C.; Corrêa,Andréa A. R.; Rodrigues,Maykmiller C.; Marin,Diego B.. |
| ABSTRACT The need for treated water is essential for life. With the constant increase in population, the most common way to purify surface water is through conventional water treatment plants (WTPs). The high volume of residue (sludge) generated in this process is most often returned to the catchment site, negatively affecting the ecosystem. The sludge of WTPs is similar to soil because it is composed of inorganic solids. Adobe is a construction material made from water and soil without the burning process, so it is considered sustainable, recyclable, and energy-efficient and can be stabilized with various materials. Therefore, the objective of this work is to develop adobes using the sludge of WTPs and to analyse their physical, mechanical and thermal... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Wastewater treatment plants; Building materials; Sustainability; Composite materials; Waste in construction. |
| Ano: 2019 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-69162019000600684 |
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| Costa,Bruno R. S.; Oldoni,Henrique; Silva,Wendell A.; Martins,Roberto L.; Bassoi,Luís H.. |
| ABSTRACT Variation in the spatial distribution of leaf chlorophyll content associated with the progression of the phenological cycle of crops may occur in cultivated areas as a result of the variability of environmental conditions and of the intrinsic properties of the plants. The objective of the present study was to model the trend in variation and assess the temporal stability of index of chlorophyll a, b, and total chlorophyll (Chla, Chlb, and Chlt, respectively), and to characterize the spatial distribution of Chlt index in grapevine cv. ‘Chardonnay’. The assessments consisted of in situ measurements made with a portable meter in a commercial vineyard located in the municipality of Espírito Santo do Pinhal, state of São Paulo, Brazil, in the period... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Vitis vinifera L.; Photosynthetic pigments; Portable meter. |
| Ano: 2019 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-69162019000800074 |
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| Barbieri,João D.; Dallacort,Rivanildo; Faria Junior,Cleonir A.; Freitas,Paulo S. L. de; Carvalho,Marco A. C. de. |
| ABSTRACT: The objective of this study was to define the best irrigation level in a sprinkler system, submitted to nitrogen doses in covering in the municipality of Tangará da Serra - MT, for two cultivars of peanut (Arachis hypogaea L.). The experiment was carried out in the experimental field of the State University of Mato Grosso (UNEMAT), located geographically in latitude 14°39′S; Longitude 57°25′W, at 440 meters of altitude. The climate is classified as tropical humid megathermal (Aw), with annual average rainfall of 1,830 mm and average temperature of the air 24.4°C. The soil is classified as Dystroferric Red Latosol. The experimental design was in randomized blocks where 4 levels (30, 70, 110 and 150% of the... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Evapotranspiration; Correlation; Productivity. |
| Ano: 2017 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-69162017000601126 |
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| Oliveira,Guilherme M. P. de; Gandolfo,Marco A.; Oliveira,Rone B. de; Oliveira,Stella M. P. de; Martins,Vinicius A.. |
| ABSTRACT The possibility of synthetic auxin applications in crops increases the risk of injury to sensitive plants. The aim of this study was to quantify the drift of herbicides sprayed in a wind tunnel and the injury in cotton plants. The experimental design was a completely randomized design with five treatments and four replications. The tested spray solutions were dicamba (0.250 L c.p. ha−1), glyphosate (0.625 L c.p. ha−1), 2,4-D (0.250 L c.p. ha−1), glyphosate + 2,4-D (0.625 L c.p. ha−1 + 0.250 L c.p. ha−1), and glyphosate + dicamba (0.625 L c.p. ha−1 + 0.250 L c.p. ha−1). Drift was quantified in a wind tunnel, collected at distances of 5, 10, and 15 m in relation to the spray tip. Cotton plants were placed in the same wind tunnel and the injury was... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Dicamba glyphosate herbicide mixture application technology 2; 4-D. |
| Ano: 2019 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-69162019000100075 |
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| Terminiello,Antonino M.; Balbuena,Roberto H.; Draghi,Laura M.; Claverie,Jorge A.; Palancar,Telmo C.; Jorajuría,Daniel. |
| Os solos submetidos a sistemas de produção que não incluem o preparo do solo, estão condicionados, em sua sustentabilidade, a um manejo que priorize o acompanhamento da compactação que o tráfego de máquinas provoca. Foram realizados ensaios de campo com o objetivo de avaliar a reologia de um solo Typic Hapludert, submetido ao tráfego de veículos em dois sistemas de preparo do solo (preparo convencional - LC, e semeadura direta - SD). Os subtratamentos foram quatro intensidades de tráfego (0; 80; 160 e 240 Mg km ha-1). As variáveis experimentais dependentes foram: índice de cone (IC) e densidade aparente a seco (DA). Para 160 e 240 Mg km ha-1, encontraram-se diferenças estatísticas significativas no IC em relação à testemunha. Para o LC, com as maiores... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Compactação induzida; Intensidade de tráfego; Semeadura direta. |
| Ano: 2004 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-69162004000100018 |
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| Costa,Lilian L.; Silva,Henrique J. P. Soares da; Almeida,Dieimisson P.; Ferreira,Marcelo da C.; Pontes,Nadson de C.. |
| ABSTRACT Biological insecticides can be another pest control method used in integrated pest management; hence there is a demand for scientific information about these products to understand the appropriate application technique. The aim of this study was to evaluate the spray spectra data by different nozzle types using biological insecticide isolated and with adjuvants, as well the surface tension of these spray solutions. For droplet spectra data, a particle size analyzer was used and for surface tension of the spray solution, the method of pendant drop was used. Among the nozzles tested, ADI 11002 provided greater droplets median diameter volume, a lower percentage of droplets with diameters less than 100 μm and also the highest coefficient of... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Coefficient of uniformity; Volumetric median diameter; Application technology; Tensiometer. |
| Ano: 2017 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-69162017000200292 |
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| Custódio,Anselmo A. de P.; Gomes,Natalino M.; Lima,Luiz A.. |
| Foi estudado o efeito da irrigação sobre a classificação do café grão cru, quanto ao tipo, formato do grão e sua granulometria, nas cinco primeiras safras, em lavoura irrigada por pivô- central, aplicando-se cinco lâminas de irrigação em função do balanço entre a evaporação do tanque classe A (ECA) e precipitação (P), além de tratamento-testemunha (não-irrigado). A cultivar plantada foi a Rubi, em março de 1999, no espaçamento de 3,5 m entre linhas e 0,8 m entre plantas. Não foi observado efeito significativo da irrigação sobre os aspectos estudados: tipo (defeitos intrínsecos), formato (grãos chatos e moca) e granulometria dos grãos (peneiras). Contudo, entre as classes de defeito, os grãos verdes e ardidos foram os que apresentaram os maiores percentuais... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Coffea arabica L.; Defeitos intrínsecos; Granulometria dos grãos. |
| Ano: 2007 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-69162007000400012 |
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| Lorin,Higor E. F.; Costa,Mônica S. S. de M.; Chiarelotto,Maico; Santos,Francielly T. dos; Costa,Luiz A. de M.. |
| ABSTRACT The recovery of waste from the broiler production chain (BPC) is consistent with the principles of a circular economy. Besides turning waste into organic compost, its use as substrate for the production of vegetable seedlings further increases its economic value. However, it is necessary to adapt its characteristics to enable its use as substrate. To this end, the addition of boiler remnant charcoal wastes (BCW), another type of waste generated in the BPC, to the organic compost resulting from the composting of BPC waste with different bulking agents (BAs) was studied. The addition of BCW to agro-industrial compost reduced the electrical conductivity (EC) of substrates. Multiple linear regression showed that, of the 13 variables (physical,... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Electrical conductivity; Circular economy; Easiness of removal of clod from tray; Seedling quality index; Salinity. |
| Ano: 2019 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-69162019000600753 |
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| Garcia,Luiz C.; Weirich Neto,Pedro H.; Justino,Altair; Eurich,Joelcio; Souza,Nátali M.. |
| ABSTRACT The aim of this study was to analyze the influence of space between the base and intermediate base on quality of seed distribution with a horizontal seed plate. The experiment was carried out in 2012 at the Laboratory of Agricultural Mechanization of the State University of Ponta Grossa - PR, Brazil, using a sowing simulation device. The experimental design was completely randomized design with four treatments and seven replications. Treatments consisted of spaces (0, 1, 2, and 3 mm) between the base and intermediate base. Replications were defined by 250 spacing between seeds. Corn (Zea mays L.), soybean (Glycine max L. Merrill), and sorghum (Sorghum bicolor Moench) seeds were tested. The analyzed variables were faulty, multiple and acceptable... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Horizontal seed plate; Glycine max; Seeder-fertilizer machine; Sorghum bicolor; Zea mays. |
| Ano: 2017 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-69162017000100128 |
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| Xie,Shengshi; Wang,Chunguang; Deng,Weigang. |
| ABSTRACT For the purpose of achieving the distribution of the potato-soil mixture and the appropriate parameters of the swing separating sieve, we conducted experiments using the 4SW-170 potato digger. The experiments consisted of two parts. In each part, the experimental factors were crank rotational speed, sieve inclination and machine forward speed. The difference is that the first part involved a single factor test, which selected the coverage of the potato-soil mixture as the evaluation indicator. In contrast, the second part involved an orthogonal test, which selected the obvious rate and damage rate as evaluation indexes. In the first part, it was observed that the coverage of the potato-soil mixture on the separating sieve reduced gradually with... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Swing separating sieve; Coverage of potato-soil mixture; Parameter optimization; Experimental studies. |
| Ano: 2019 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-69162019000400548 |
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| Milani,Adhemar P.; Bidóia,Vitor S.; Perecin,Dilermando. |
| Este trabalho foi desenvolvido com o propósito de estudar o comportamento granulométrico de grãos de soja em função da variação do teor de água. A pesquisa foi realizada com seis variedades, sendo duas transgênicas e quatro comuns, com os teores de água de 10%, 12%, 15%, 20% b.s. A granulometria foi determinada utilizando-se de seis subamostras de 120 grãos para cada teor de água, e as suas dimensões (comprimento, largura e espessura) obtidas por meio de paquímetro digital. Os resultados indicaram que cada variedade de soja comportou-se de maneira diferenciada e que as comuns tiveram comportamento granulométrico diferenciado das transgênicas. |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Granulometria; Teor de água; Variedades de soja. |
| Ano: 2009 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-69162009000400015 |
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| Deus,Fábio P. de; Faria,Manoel A. de; Oliveira,Ednaldo L. de; Castro Neto,Pedro. |
| The aim of this research was to evaluate the effects of different irrigation depths and potassium dosages, of Jatropha seed oil content and yield. The experimental design used was randomized blocks, in split-plots, with four replicates. The treatments were four water depths (plots) and four potassium dosages (subplots) applied through irrigation water. The water depths were applied based on the percentage of accumulated evaporation of a Class A (ECA) tank and of rainfall, as following: L0 = without irrigation, L40, L80 and L120, representing 40, 80 and 120% of the balance, respectively. The potassium dosages were K30, K60, K90 and K120 (30, 60, 90 and 120kg ha-1 of potassium, respectively). The oil extraction of samples was done through chemical extraction... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Chemical extraction; Biodiesel; Oilseed; Drip irrigation. |
| Ano: 2012 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-69162012000600010 |
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| Baracho,Marta S.; Nääs,Irenilza De A.; Gigli,Ana C. S.. |
| Este trabalho visou a quantificar as características de resposta produtiva de pintos de corte provenientes de duas linhagens comerciais, em incubatório de regime de estágio múltiplo. Para tal, foram monitorados três lotes de ovos férteis em incubatório comercial, verificando o impacto das seguintes variáveis ambientais: temperatura, velocidade do ar, umidade relativa, concentração de dióxido de carbono e presença de fungos. O acompanhamento de pintos provenientes de duas linhagens comerciais distintas (Cobb® e Avian®) foi feito em três lotes, quando também foram coletados dados de perdas. A análise de componentes principais foi empregada para associar as variáveis de ambiente, produção e perdas, observando a magnitude dos vetores. Os resultados mostraram... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Avicultura; Incubação; Ambiência. |
| Ano: 2010 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-69162010000400001 |
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| Celuppi,Rafael; Scapinello,Jaqueline; Andrade,Felipe G. D.; Revello,Jaime H. P.; Magro,Jacir Dal. |
| Energy consumption in the world has been growing every year. The industrial sector represents 27.32% of the world energy demand. Heating systems that use solar energy may contribute with a percentage of the total energy required by industries. This work aimed to study the use of vacuum solar collectors for water pre-heating in boilers. We used four collectors installed according to NBR 15,569; water flow through the tubes was 0.058 L/s, and temperature in the inlet and outlet pipes was measured. Results showed that instantaneous radiation, and inlet fluid and room temperatures are variables that influence the process, reaching water maximum temperature in the solar collector outlet of 97.9 °C, and efficiency of approximately 65% for most experiments. For... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Solar collector; Water heating; Energy efficiency. |
| Ano: 2014 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-69162014000300009 |
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| Costa,Edilson; Leal,Paulo A. M.; Benett,Cleiton G. S.; Benett,Katiane S. S.; Salamene,Luiz C. P.. |
| The seedlings production is an essential part for vegetables production. Thus, this study aimed to evaluate the environment, the substrates and the containers in the development of tomato seedlings, cv. Santa crus Kada Gigante, in Aquidauana -MS, Brazil region, from October to November, 2008. Polystyrene trays with 72; 128 and 200 cells, filled with four substrates (soil; Plantmax®; coconut fiber and vermiculite) were tested in three protected environments (greenhouse; screened with Sombrite® and screened with Aluminet®). The experimental design was completely randomized, factorial scheme 3x4 (three trays x four substrates), with four replications, being analyzed individual variance analysis and joint analysis for the environments. The environment with... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Solanum lycopersicum; Protected cultivation; Propagation. |
| Ano: 2012 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-69162012000500002 |
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| Márques,Luis. |
| Os primeiros tratores agrícolas utilizavam como elementos de locomoção rodas metálicas com garras. Diante da impossibilidade de circular por estradas, os danos provocados sobre os caminhos e o recalque em solo desagregado tornaram necessária a busca de outros materiais para os rodados dos tratores. Os rodados pneumáticos, ao se deformarem, adaptam-se melhor às irregularidades do terreno, aumentando a capacidade trativa e a comodidade para o operador. A diminuição da lastragem, substituída por cargas dinâmicas induzidas por transferência de peso, melhora ainda mais o desempenho das rodas no solo, convertendo-as em verdadeiros pontos de apoio. Apesar de toda evolução experimentada pelos rodados, os mesmo oferecem diversas opções técnicas que nem sempre são... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Pneus agrícolas; Eficiência em tração; Patinagem. |
| Ano: 2008 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-69162008000300019 |
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| Registros recuperados: 1.831 | |
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