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| Registros recuperados: 24 | |
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| Cunha,João P. A. R. da; Reis,Elton F. dos; Assunção,Heli H. T. de; Landim,Thiago N.. |
| ABSTRACT Knowledge of droplet spectra generated by spray nozzle tips is important to ensure the quality of applications of plant protection products. However, there are different methods for this evaluation, which can cause difficulty in interpreting the results. This study aimed to evaluate the droplet spectra produced by the flat fan spray tip AD 11002 operated under different pressures and using different techniques and equipment. The volume median diameter (VMD), percentage of spray volume in droplets smaller than 100 µm diameter and relative spam (RS), considering pressures of 200, 300, and 400 kPa were determined using two direct measurement equipment (Spraytec and Shadow Sizer), based on laser diffraction and image analysis, respectively, and a... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Application technology; Droplet size; Water-sensitive paper; Laser diffraction. |
| Ano: 2019 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-69162019000400476 |
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| Cunha,João P. A. R. da; Alvarenga,Cleyton B. de; Rinaldi,Paula C. N.; Marques,Matheus G.; Zampiroli,Renan. |
| ABSTRACT The use of remotely piloted aircrafts (RPAs) to apply plant protection products has grown a lot in agriculture worldwide. However, little research data are available regarding the efficiency and safety of this method, especially in Brazil. Thus, this review aimed to present the current scenario of scientific research involving RPAs in the application of pesticides. Several factors interfere with the quality of this type of application. Among them are height and flight speed, droplet generator elements, application rate, and spray solution properties. In general, applications have been performed between 1.0 m and 3.0 m of height and 1.0 m s-1 and 7.0 m s-1 of speed. As for the droplet generator element, there is still no clarity as to the ideal... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Application technology; Drones; Pesticides; Spraying. |
| Ano: 2021 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-69162021000200245 |
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| Cunha,João P. A. R. da; Teixeira,Mauri M.; Fernandes,Haroldo C.. |
| As pontas de pulverização são os componentes mais importantes dos pulverizadores na aplicação de agrotóxicos. Dessa forma, este trabalho teve como objetivo avaliar o espectro de gotas de pontas de pulverização hidráulicas de jato plano (standard e antideriva) e de jato cônico vazio, disponíveis no mercado, submetidas a diferentes pressões da calda. Em ambiente controlado, avaliou-se o espectro de gotas, por meio de um analisador a laser de gotas em tempo real, nas pressões de 200; 300 e 400 kPa para as pontas de jato plano, e de 400; 500 e 600 kPa para as pontas de jato cônico. Os resultados permitiram concluir que: o espectro de gotas foi influenciado pela vazão nominal das pontas e pela pressão da calda; o potencial de deriva das pontas de jato plano... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Tecnologia de aplicação; Agrotóxicos; Pulverizadores. |
| Ano: 2007 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-69162007000200002 |
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| Cunha,João P. A. R. da; Barizon,Robson R. M.; Ferracini,Vera L.; Assalin,Marcia R.; Antuniassi,Ulisses R.. |
| ABSTRACT Pesticide drift is an issue in modern farming, mainly for crops under constant spraying as soybeans. This study aimed at assessing drift and pest control for aerial applications in soybean crops. Hydraulic nozzles and rotary atomizers, regulated to a wide spectrum of droplet sizes, sprayed thiamethoxam plus lambda-cyhalothrin using an agricultural aircraft Ipanema 202A at volume rate of 20 L ha−1. Treatments consisted of testing two devices: a rotary cage atomizer (Micronair AU 5000) with blade angles of 65° for larger droplets, and with angle of 55° for smaller ones; and a set of adjustable nozzles (Stol model) with deflector angle of 90° for smaller droplets, and with angle of 30° for larger ones. Drift was evaluated through quantification of... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Agricultural aviation; Crop protection; Exodrift; Glycine max. |
| Ano: 2017 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-69162017000300493 |
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| Cunha,João P. A. R. da; Martins,Daniel H.; Cunha,Walter G. da. |
| Potato is an important crop plant throughout the world. Harvesting is a fundamental step in its production system. Maybe, it is the most complex and expensive operation. Thus, the objective of this work was to compare the cost of the mechanized and semi-mechanized harvest, the operational capacity and the production losses during the potato harvest process. The work was accomplished in a commercial farming, cultivated under pivot system, in the municipal district of Perdizes - MG, Brazil. A completely randomized design with two treatments was used: mechanized and semi-mechanized harvest. The mechanized harvest used a self-propelled harvester. In the semi-automated harvest, a digger mounted on tractor was used and the potato was manually harvested. It was... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Mechanical harvest; Field efficiency; Operational cost; Solanum tuberosum. |
| Ano: 2011 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-69162011000400020 |
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| Cunha,João P. A. R. da; Palma,Roxanna P.; Oliveira,Arthur C. de; Marques,Matheus G.; Alvarenga,Cleyton B. de. |
| ABSTRACT The hardness and pH of the spray water can interfere with the weed control effectiveness with herbicides, but it is not clear the magnitude of this interference, mainly associating different levels of pH and hardness to different glyphosate formulations. This study aimed to evaluate the influence of hardness and pH, in association, of the water used in the application of two glyphosate formulations on the weed control effectiveness. The experiment was conducted in duplicate, in areas with a predominance of Digitaria horizontalis, under a randomized block design with a 4×4×2+1 factorial scheme, composed of four water hardness levels (70, 110, 230, and 430 ppm CaCO3), four pH levels (3.5, 4.5, 5.5, and 6.5), two glyphosate formulations (ammonium... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Herbicide; Water quality; Spraying; Application technology. |
| Ano: 2020 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-69162020000400555 |
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| França,Jorge A. L.; Cunha,João P. A. R. da; Antuniassi,Ulisses R.. |
| ABSTRACT The aim of this study was to evaluate the spectrum and the velocity of droplets produced by nozzles with and without air induction, under different pressures and flow rates. The experiment was conducted in a completely randomized design with five replications, in a factorial 2 x 3 x 3 (two spray nozzles, three flow rates and three operating pressures). The spray nozzles with and without air induction of the Hypro manufacturer (GA and VP) were evaluated, with nominal flow rates of 0.76; 1.14 and 1.51 L min-1 and pressures of 200, 300 and 400 kPa. The spectrum and velocity of the droplets were determined directly, using a Visisize Portable P15 (Oxford Lasers, Imaging Division). The pressure increases further reduction of the VMD and the relative... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Spray drift; Droplet size; Application technology of pesticides. |
| Ano: 2018 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-69162018000200232 |
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| Cunha,João P. A. R. da; França,Jorge A. L.; Alvarenga,Cleyton B. de; Alves,Guilherme S.; Antuniassi,Ulisses R.. |
| ABSTRACT For the successful application of phytosanitary products, it is essential to understand the spraying process well. The present work aims to evaluate the spectrum and speed of the droplets produced by different spray nozzle models with air induction, working under different operating conditions. The experiment was conducted using an entirely randomized design with five repetitions in a 3 × 3 × 3 factor scheme that incorporates three nozzle models (ADIA, AIXR, and GA), three nominal flows (0.76, 1.14, and 1.51 L min−1), and three operating pressures (200, 300, and 400 kPa). The spectrum and speed of the droplets were determined directly using a real-time droplet analyzer based on high-resolution image analysis. The spray nozzle model interfered with... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Spray tip; Droplet spectrum; Sprayer; Application technology. |
| Ano: 2020 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-69162020000600711 |
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| Assunção,Heli H. T. de; Silva,Sérgio M.; Alves,Guilherme S.; Zandonadi,Cesar H. S.; Cunha,João P. A. R. da. |
| ABSTRACT Electrostatic spray can bring benefits to the pesticide application such as the reduction of application rate and the increase of deposits on targets. Therefore, this study aimed to evaluate the effect of electrostatic spraying using lower application rates and different adjuvants on soybean spray deposition and chemical control of powdery mildew (Microsphaera diffusa Cooke & Peck). The field experiment was conducted in duplicate. A randomized complete block design with four replications in a 2 × 2 × 2 + 1 factorial scheme was used. The factors were two application rates, with and without droplet electrification, two spray solution compositions, and one additional treatment. Deposition on upper and lower leaves, spray loss to the soil, and... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Application rate; Droplet electrification; Application technology; Microsphaera diffusa. |
| Ano: 2019 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-69162019000600721 |
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| Reis,Elton F. dos; Queiroz,Daniel M. de; Cunha,João P. A. R. da; Alves,Sueli M. F.. |
| Os avanços da tecnologia de aplicação aérea de agroquímicos têm-se dado na direção de redução do volume de calda, o que pode ocasionar má distribuição e consequente deposição irregular. O presente trabalho teve como objetivo avaliar a qualidade da aplicação de calda de pulverização em aplicação aérea, na cultura da soja (Glycine Max L.). Para a aplicação, foi utilizada uma aeronave agrícola experimental, aplicando um volume de calda de 20 L ha-1 . Para a determinação dos volumes depositados nas folhas do terço superior, médio e inferior das plantas de soja, foi utilizado corante alimentício azul brilhante adicionado à calda de pulverização. Estas folhas foram lavadas, e o volume determinado por espectrofotometria. Para a obtenção do espectro de gotas,... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Tecnologia de aplicação; Aviação agrícola; Controle estatístico. |
| Ano: 2010 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-69162010000500017 |
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| Landim,Thiago N.; Cunha,João P. A. R. da; Alves,Guilherme S.; Marques,Matheus G.; Silva,Sérgio M.. |
| ABSTRACT Adjuvants are tools to maximize pesticide spray quality. This study aimed to evaluate the interaction effects between adjuvants and the fungicide azoxystrobin + benzovindiflupyr on the physicochemical characteristics, droplet evaporation time, and spray droplet size. The experiment was carried out using a 2×6 factorial scheme, in which the first factor was the absence or presence of the fungicide mixture (water or water + fungicide) and the second factor was the presence of different adjuvants (water and five adjuvants). The parameters evaluated were surface tension, pH, viscosity, electrical conductivity, droplet evaporation time, volume median diameter, percentage of droplets smaller than 100 μm, and relative amplitude of the droplet spectrum.... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Spray solution additives; Droplet spectrum; Surfactants; Application technology. |
| Ano: 2019 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-69162019000500600 |
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| Assunção,Heli H. T. de; Cunha,João P. A. R. da; Silva,Sérgio M.; Alves,Guilherme S.; Lemes,Ernane M.. |
| ABSTRACT It is a well-known fact that the application of pesticides can be improved using an electrostatic spray due to the reduction of the application rate and increase in deposition on plant targets. However, little information exists on the use of such technology in maize crops. Thus, this study is aimed to evaluate the spray deposition on maize resulting from spray application using an electrostatic sprayer in combination with low application rates and different spray compositions. A field experiment was conducted in a randomized block having a 2×2×2 factorial design with two application rates (95 and 52 L ha-1), with or without the spray electrification, and with or without the synthetic adjuvant. The droplet electrification ability, interference of... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Zea mays; Application rate; Electrified droplet; Spray technology; Spray deposition. |
| Ano: 2020 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-69162020000400503 |
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| Cunha,João P. A. R. da; Moura,Eudes A. C.; Silva Júnior,Jair L. da; Zago,Flávio A.; Juliatti,Fernando C.. |
| O controle químico eficiente da ferrugem asiática da soja depende da correta seleção da ponta de pulverização. Este trabalho teve o objetivo de avaliar o efeito da utilização de diferentes pontas de pulverização na aplicação de fungicida para o controle da ferrugem da soja. O ensaio foi conduzido no delineamento em blocos ao acaso, com quatro repetições, em esquema fatorial (4 x 2) + 1: quatro tipos de ponta de pulverização (jato plano defletor duplo, jato plano duplo com pré-orifício e jato cônico vazio com e sem indução de ar), dois volumes de aplicação (150 e 200 L ha-1) e um tratamento adicional que não recebeu fungicida. Realizou-se a semeadura direta da cultivar de soja M-SOY 8008 (ciclo precoce), avaliando-se, após a aplicação do fungicida... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Tecnologia de aplicação; Glycine max L.; Phakopsora pachyrhizi. |
| Ano: 2008 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-69162008000200009 |
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| Registros recuperados: 24 | |
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