Cleyton Batista de Alvarenga

Cleyton Batista de Alvarenga
Universidade Federal de Uberlândia (UFU) | UFU

Doctor of Engineering Agricultural

About

61
Publications
5,075
Reads
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149
Citations
Citations since 2016
25 Research Items
114 Citations
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201620172018201920202021202205101520
201620172018201920202021202205101520
Introduction
Agricultural machinery and mechanization Application technology for pesticide products, fertilizers and soil improvers
Additional affiliations
July 2013 - present
Universidade Federal de Uberlândia (UFU)
Position
  • Researcher
Education
March 2009 - April 2012
Universidade Federal de Viçosa (UFV)
Field of study
  • Pesticide application technology

Publications

Publications (61)
Article
Full-text available
Chemical control is essential for efficient pest management in coffee crops. Application technologies should safely deliver insecticides to the target whilst protecting the environment, insecticide applicators, and consumers. To achieve these goals, application volumes, hydraulic nozzles, and application techniques should be evaluated. This study a...
Article
Full-text available
Bean crop is attacked by several phytophagous insects, affecting its production and causing losses to farmers. Among the insects considered as bean crop pests, aphids can cause economic damage by continuously sucking the plant sap throughout crop development. Thus, this study aimed to evaluate the control of Aphis craccivora on bean crop with insec...
Article
Full-text available
É crescente o uso de sistemas remotos para aplicação de agrotóxicos, entretanto, observa-se a carência de estudos relacionados ao tema. O presente trabalho teve como objetivo desenvolver e avaliar uma aeronave remotamente pilotada (RPA) para a aplicação de agrotóxicos. Inicialmente, projetou-se a RPA, e construiu-se com poliestireno extrudado de 5...
Article
Full-text available
Water magnetization and geoprocessing are increasingly utilized tools in weed management. Our objective was to study the influence of water magnetization on herbicide efficiency and to verify whether there is a relationship between control scores and the normalized difference vegetation index (NDVI). In the laboratory experiment, water was subjecte...
Conference Paper
Full-text available
Nesse artigo é feito um estudo de modelos de aprendizado profundo para auxiliar os agricultores na melhor tomada de decisão da colheita dos cafeeiros. Este é um problema pouco explorado na literatura e se torna muito difícil por conta dos frutos amadurecerem de maneira desuniforme na planta. Nesse sentido, coletamos milhares de imagens de cafeeiros...
Article
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A velocidade de trabalho é um dos fatores que pode influenciar a distribuição longitudinal de plântulas, o estande final e a produtividade da lavoura. Objetivou-se com este trabalho avaliar, em condições de campo, o desempenho de uma semeadora-adubadora no estabelecimento inicial da cultura do milho, em quatro velocidades de trabalho e dois mecanis...
Article
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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 applicati...
Article
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The correct deposition of spray along the canopy is important for the phytosanitary control in coffee plants; however, the structure of the plant makes this distribution difficult. This study aimed to evaluate the deposition of a tracer on leaves and fruits in coffee cultivation, with respect to the application rate and type of hydraulic nozzle, as...
Article
Full-text available
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 randomi...
Article
Full-text available
Coffee production faces challenges due to the susceptibility of the crop to insects. Owing to the coffee leaf miner Leucoptera coffeella, which is one of the main insect pests, the technology for the application of phytosanitary measures becomes the main challenge for coffee growers. This study aimed to evaluate the effectiveness of coffee leaf min...
Article
Full-text available
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 use...
Article
Full-text available
The aim of the current study is to develop an electronic system capable of automatically replacing hydraulic spray nozzles, based on psychrometric air conditions such as temperature and relative air humidity, in order to help improving the efficiency of application technologies. The system comprised one microcontroller, two solenoid valves, one tem...
Article
Full-text available
Adverse weather conditions, or mechanical problems and decrease in the application rate, may increase the storage time of the spray solution in the sprayer tank. This study aimed to assess the effect of the phytosanitary spray solution storage on the germination of Beauveria bassiana conidia, with or without agricultural adjuvants. A completely ran...
Article
Full-text available
O Brasil é o maior produtor e exportador mundial de café e vem enfrentando dificuldades em razão da suscetibilidade da cultura à ocorrência de insetos. Objetivou-se, com este trabalho, avaliar parâmetros da aplicação utilizando a pulverização hidropneumática com o uso de diferentes volumes de calda e pontas de pulverização, na presença e ausência d...
Article
Full-text available
ABSTRACT Stenoma catenifer is considered the main pest of avocado, making impossible to commercialize the infested fruits. This study was conducted with the objective of evaluating the potential of Heterorhabditis amazonensis MC01 in the field control of avocado borer, as well as the nematode release method. Two treatments were tested, namely: rele...
Article
Full-text available
Biological control is a viable alternative to chemical control; however, some methods of releasing control agents still need to be improved in order to attract the attention of producers and to reduce costs. Therefore, this work was conducted to evaluate the effects of hydraulic spray nozzles on the viability and infectivity of entomopathogenic nem...
Article
Full-text available
O cultivo de alface no sistema orgânico é crescente no Brasil. No entanto, para ser cultivada no sistema orgânico, faz-se necessário utilizar sementes provenientes de sistema orgânico conforme exigências da legislação brasileira. Atualmente, são escassas pesquisas referentes ao desempenho agronômico e à qualidade fisiológica de sementes de alface n...
Article
Full-text available
Leaf miner is a major coffee tree pest that causes severe losses. Most farmers perform chemical control in an attempt to reduce damage to the crop. Thus, the current study aims to analyze spraying efficiency and control effectiveness according to the management plan adopted in a coffee farm in the Cerrado of Minas Gerais. The application used Arbus...
Article
Full-text available
Os fabricantes de pontas de pulverização constantemente disponibilizam novos modelos no mercado na tentativa de aumentar a eficiência das aplicações, entretanto muitas vezes seu comportamento é desconhecido em relação ao espectro das gotas produzidas. Sendo assim, este trabalho foi conduzido com o objetivo de avaliar o espectro de gotas proporciona...
Article
A potência disponível na barra de tração e na tomada de potência juntamente com a reserva de torque são algumas das principais características a serem analisadas nos tratores agrícolas. Neste sentido, conduziu-se o presente trabalho com o objetivo de avaliar os parâmetros relacionados à potência e ao torque dos tratores agrícolas de pneus comercial...
Article
Full-text available
During pesticide spraying, the psychrometric conditions of the air may cause evaporation of the droplets along their trajectory from the nozzle to the target. Thus, this study aimed to evaluate the effect of air psychrometric conditions and operating pressure on the droplet spectrum of air-assisted boom sprayers. The test was performed using a prot...
Article
Objetivou-se com este trabalho desenvolver um sistema automático de controle da vazão de ar de um pulverizador pneumático Berthoud, modelo AF 427, de acordo com as condições meteorológicas no momento da pulverização. Desenvolveu-se um diafragma automatizado posicionado na entrada de ar do ventilador, e avaliou-se a eficiência desse sistema quanto à...
Article
Full-text available
Objetivou-se com este trabalho, estudar a influência da morfometria da planta na pulverização de agrotóxicos, utilizando-se um pulverizador hidropneumático automatizado. O trabalho foi conduzido em laranjal da variedade Pêra Rio e o índice volumétrico foi adotado em função da copa e histórico da área, sendo adotado 50 mL m3. As velocidades de traba...
Article
Full-text available
A pulverização eletrostática consiste no carregamento das gotas com cargas elétricas, criando-se um campo elétrico capaz de aumentar a atração das gotas pelas plantas. Objetivou-se com este trabalho desenvolver um dispositivo eletrostático para pulverizador pneumático costal, utilizando uma fonte de alta tensão e baixo custo. Utilizou-se uma bobina...
Article
Full-text available
The objective of this study was to evaluate the effect of pressure deficit on spraying parameters for the tip JA-2 at different target heights, and discuss its implications on the evaporation of spray droplets. To study the spray parameters, water-sensitive papers were fixed to a wood frame measuring 0.5 x 1.5 meters and 2.5 meters high, and a hydr...
Article
Full-text available
The knapsack sprayer is a very popular equipment, due to its low acquisition cost and wide applicability. In recent years, electric backpack sprayers, which increase the operator's comfort and improve the spraying operation quality, have come up. This study aimed at evaluating an electric backpack sprayer, by using four flat spraying nozzles (XR 11...
Article
Full-text available
When the electrostatic spraying is used correctly, it provides advantages over conventional systems, however many factors can affect the system efficiency. Therefore, the objective of this study was to evaluate the charge/mass ratio (Q/M) at different spraying distances (0, 1, 2, 3, 4 and 5 m), and the liquid deposition efficiency on the target. Ev...
Article
Full-text available
The study was conducted to evaluate the parameters of the spraying in tree crops. The efficiency and droplet deposition on the target is important to raise the profitability of timber production, reducing environmental risks to health from the applicator, increasing effectiveness in combating pests and diseases. The aim of this study was to evaluat...
Article
Full-text available
Adjuvants are products added to spray solution in order to attend the pesticides application. However, their effects in the technical parameters of the spray are not yet fully understood. The objective was to evaluate the effects of addition of five adjuvants (A, B, C, D and E) and five dilutions (D1 = 30; D2 = 40; D3 = 50; D4 = 60 e D5 = 70 mL per...
Article
Full-text available
The principle of fractionation and droplets size are crucial for the success of pest control. This study aimed at developing and evaluating an automated system to control the spraying droplet spectrum according to the vapor pressure deficit in the air. The automatic control system consisted of a temperature and relative humidity sensor, a microcont...
Article
Full-text available
O trabalho foi desenvolvido visando avaliar os parâmetros da pulverização em culturas arbóreas. A eficiência e a deposição de gotas sobre o alvo são importantes para elevar a rentabilidade na produção de madeira, diminuindo os riscos ambientais, e para a saúde do aplicador, aumentando a eficácia no combate de pragas e doenças. O objetivo deste trab...
Article
Full-text available
Spraying of pesticides requires knowledge of weather conditions prior to, during and after operations in the field. Thus, the objective of this study was to evaluate the influence of vapor pressure deficit in the air on the spraying parameters generated by the hollow cone nozzle JA-2 on orange trees. Spraying was performed using a hydropneumatic sp...
Article
Full-text available
The hydraulic spray nozzles are highly important in hydropneumatic sprayers, since they are the main responsible by the division of the liquid into drops. This study was targeted to the operational performance of two sets of conical jet nozzles at four pressures. The following variables were evaluated: the nozzle flow rate; the influence of the pre...
Article
Hydraulic spray equipments are commonly used for pesticide application due to their flexibility under different situations. The spray nozzle is the key component to ensure distribution uniformity and suitable spectrum of droplets. The distribution uniformity is characterized by the coefficient of variation (CV) of the surface volumetric distributio...
Article
Na aplicação de agrotóxicos, os equipamentos que se baseiam na pulverização hidráulica são os mais difundidos, graças à flexibilidade que oferecem em diferentes situações. A ponta de pulverização é um componente fundamental para proporcionar uma boa uniformidade de distribuição e espectro de gotas adequado. A uniformidade de distribuição é caracter...
Article
Full-text available
Sprayer evaluation is an important tool to improve pesticide application technology. The objective of this study was to evaluate the quantitative aspects of the working conditions of boom sprayers in the region of Uberlândia, Minas Gerais, and the inspection methodology for Brazilian conditions. The evaluations were done in farm properties randomly...
Article
Este trabalho teve como objetivo desenvolver um dispositivo para promover a atração de gotas carregadas eletricamente até o interior do dossel das plantas, visando reduzir o impacto ambiental causado pelos agrotóxicos. Foram distribuídos condutores metálicos no interior do dossel das plantas, com o propósito de atrair as gotas. Foram distribuídos c...
Article
Full-text available
This study aimed to develop a device to promote the attraction of electrically charged droplets to the inner part of the citrus plants, to reduce the environmental impact caused by pesticides. Metallic conductors were distributed in the inner part of the orange Pear canopy, in order to attract the droplets. Water sensitive papers were distributed o...
Article
Full-text available
Eucalyptus is a species of great importance in the Brazilian system of production of wood. The area planted has increased annually, with the plagues that will demand larger investments. The work was conducted in Belo Oriente, Minas Gerais, in the field of reforestation of Eucalyptus grandis Celulose Nipo-Brasileira (CENIBRA). Two experiments were c...
Conference Paper
Full-text available
RESUMO: A tecnologia de aplicação de agrotóxicos é uma ciência que tem ganhado destaque nos últimos anos. Principalmente, pela possibilidade de contribuir com a redução dos custos de produção. Neste sentido, o operador deve ficar atento a todos os componentes do equipamento. O manômetro é um componente que influência diretamente a qualidade da apli...
Conference Paper
Full-text available
Resumo: O conhecimento prévio das condições de funcionamento dos pulverizadores é necessário para a execução de uma boa aplicação. Avaliou-se 28 pulverizadores hidráulicos de barra na região de Uberlândia, por meio de visitas às propriedades, para o levantamento da idade dos equipamentos e da presença de vazamentos. Deste modo, o presente trabalho...
Article
Full-text available
A inspeção periódica de pulverizadores é uma importante ferramenta para melhorar a tecnologia de aplicação de defensivos. O objetivo deste trabalho foi avaliar o estado de funcionamento de pulverizadores agrícolas na região de Uberlândia - MG, e a metodologia de inspeção para as condições brasileiras. As avaliações foram realizadas em propriedades...
Article
Full-text available
Sprayer periodic inspection is an important tool to improve pesticide application technology. The objective of this work was to evaluate the working conditions of boom sprayers in the region of Uberlândia - MG, and the inspection methodology for Brazilian conditions. The evaluations were done in farm properties randomly visited and consisted of a q...
Article
Full-text available
The irrigation of pastures has the purpose of reducing the seasonal period of production, preventing loss yield due to drought conditions. However, mistakes have been made, as the application of the same water blade during all plant's growing season, due to the lack of knowledge of plant evapotranspiration for water replacement. In order to minimiz...
Article
Full-text available
The experiment was conducted in the municipality of Perdizes - MG in Dark dystrophic Oxisol under cerrado, clay. Testing different seeding rates in conjunction with two different doses of total nitrogen. The densities were 250, 450, 650 and 850 viable seeds/m2, while the total nitrogen levels were 90 and 120 kg.ha-1, in a split-plot in randomized b...
Article
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This study evaluated the effect of wheat sowing density, using five cultivars indicated for Central Brazil. The experiment was done at Rio Brilhante farm, in the county of Coromandel, in Minas Gerais State, using the cultivars Embrapa 22, Embrapa 42, BRS 210, BRS 254 and BRS 264, sown at the densities 150, 300, 450 and 600 viable seeds m2. The plot...
Article
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This study evaluated the grain yield of wheat (Triticum aestivum L.) genotypes, in three environments in Minas Gerais. Twenty three genotypes were evaluated, including three controls, fifteen lines and five obsolete cultivars. The experiments were done in the agricultural year 2003, in the following locations: Perdizes, Coromandel and Unai; the exp...
Article
Full-text available
O conhecimento da ocorrência, reação e movimento no solo é de muita importância para se analisar o comportamento dos minerais no sistema solo-planta. As reações têm muito a ver com a solubilidade dos minerais que os contêm e com a existência de material orgânico e inorgânico, cujos radicais e superfícies propiciam o meio adequado para o controle da...

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