Eusímio F. Fraga Jr

Universidade Federal de Uberlândia (UFU) | UFU · Institute of Agricultural Sciences (ICIAG)

The coffee plant is one of the main crops grown in Brazil. However, strategies to estimate its yield are questionable given the characteristics of this crop; in this context, robust techniques, such as those based on machine learning, may be an alternative. Thus, the aim of the present study was to estimate the yield of a coffee crop using multispe...

Muitas tecnologias vêm sendo utilizadas para melhorar e otimizar a produção de café, várias delas focam na utilização de fertilizantes orgânicos e organominerais. Dentro deste contexto, conduziu-se experimento com a finalidade de avaliar o efeito da aplicação de fertilizantes organominerais associados ao esterco de galinha sobre a nutrição mineral,...

A desinfestação do substrato torna-se obrigatória na produção de mudas sadias e com vigor. No entanto, o tratamento convencional com agroquímicos pode ser insatisfatório, devido aos custos e aos riscos de vácuo biológico e intoxicação. Para minimizar essas limitações, a solarização surge como uma técnica potencialmente viável. Por conseguinte, esse...

The selection of genotypes with agronomic potential associated with drought tolerance is considered of high complexity. An alternative could be the use of selection indexes that can evaluate multiple characteristics simultaneously. This study aimed to select tomato genotypes with agronomic potential and drought tolerance by selection indexes. The e...

Coffee irrigation has increased in the main Brazilian coffee regions. However, in recent years, with climate change, years with water deficits greater than 150 mm have been observed, affecting the vegetative and productive development of the crop and also the replenishment of surface and underground springs. One practice that increases soil water r...

O cafeeiro está entre as principais culturas irrigadas do Brasil e o seu consumo de água tem sido quantificado, principalmente, pelo uso de variáveis climatológicas, como a evapotranspiração de referência (ETo) e o coeficiente de cultura (Kc). Os coeficientes utilizados no manejo da irrigação e na estimativa da evapotranspiração (ET) do cafeeiro sã...

About the profitability and production costs balance, the coffee crops goes through hard difficults, necessitating proposals for adjustments. Brazil is the world's largest producer and exporter of coffee, a very important crop for the Cerrado Mineiro, region of this work. Water and electricity consumption were evaluated in two irrigation management...

To quantify water stress on coffee trees, leaf water potential (LWP) measurements are commonly performed in a Scholander chamber; however, this methodology is restricted to research activities, due to the difficulty of measurement in the field: sampling hours at predawn and intensive work. A crop water stress index (CWSI) based on leaf temperature...

The leaf area index (LAI) is relevant in studies of phenomena at different scales, such as for the leaf to canopy scale and the calculation of the extinction coefficient of photosynthetically active radiation (kPAR), providing input for the parameterization of physiological basis models. The objective of this work was to verify the variation of the...

Brazil has been the world's largest coffee producer and exporter for several years, a crop that is an important source of foreign exchange for the country, especially in the 'Cerrado Mineiro' region, where this study was carried out. The objective of this study was to evaluate a method of irrigation management that uses sensors with IoT technology,...

Studies of sugarcane varieties grown under water-restrictive conditions are necessary because climate changes may result in insufficient rain for agriculture and selecting or breeding drought-tolerant cultivars will become more and more important. This study aimed to quantify the accumulation and partitioning of biomass, as well as water use effici...

Studies of sugarcane varieties grown under water-restrictive conditions are necessary because climate changes may result in insufficient rain for agriculture and selecting or breeding drought-tolerant cultivars will become more and more important. This study aimed to quantify the accumulation and partitioning of biomass, as well as water use effici...

The higher heating value (HHV) of sugarcane biomass components has been well documented; however, the effect of different soil water levels (abiotic stress) during the growing season on HHV has not been assessed for this energy crop. Drip irrigation in sugarcane production presents a potential to be a disruptive technology for sugarcane mills in te...

The plant water potential and the leaf temperature are physiological responses of the coffee tree that can be used as indicative of the irrigation management of this crop. There is a dependence between the leaf water potential with the potential matrix of the soil solution, however, the water potential levels found for the coffee tree show divergen...

A seleção de genótipos tolerantes ao déficit hídrico pode beneficiar a cultura do tomateiro favorecendo maiores produtividades. O objetivo do trabalho foi avaliar a potencialidade de solução osmótica de manitol como simulador de deficiência hídrica para seleção de genótipos de tomateiro. Adotou-se o delineamento inteiramente casualizado (DIC) com q...

Although the concept of field capacity has been subject to different interpretations over the years, thus it is estimated is still essential for calculations used in irrigation. This study aimed was to evaluate the potential estimating the field capacityfrom equations based on the moisture retention curve for different soil types. This work was soi...

The aim of this study was to evaluate the water productivity into biomass and into sugar for 23 sugarcane varieties (second ratoon crop) under two levels of drip irrigation. Two experiments were conducted in a greenhouse. Experiment 1 comprised nine sugarcane varieties grown in a clay soil and Experiment 2 was composed of 14 varieties in a sandy-lo...

Water stress can affect the yield in tomato crops and, despite this, there are few types of research aiming to select tomato genotypes resistant to the water stress using physiological parameters. This experiment aimed to study the variables that are related to the gas exchanges and the efficiency in water use, in the selection of tomato genotypes...

The tomato crop adapts to different climatic conditions. However, the water stress, which is a relevant factor in the tomato cropping, can affect the productivity. This experiment aimed to estimate the genetic variability, after two backcrosses, and select tomato genotypes that are tolerant to water stress induced by mannitol. The advance of the ge...

This study aimed to quantify water deficit levels that compromise sugarcane initial growth exposed to different availability soil depths. The experiment was conducted in a greenhouse by using 100-liter capacity asbestos-cement boxes filled with different soil layers simulating depths of 10, 20, 30, and 40 cm. Water deficit levels were represented b...

The objective of this study was to evaluate the physiological behavior of different tomato genotypes to assist in the selection of plants with tolerance to drought stress. It was used three blocks random and ten treatments: Eight genotypes F2RC1 [UFU80- F2RC1 #1 (3.5); UFU102- F2RC1 #7 (13.4); UFU102- F2RC1 #7 (13.3); UFU102- F2RC1 #7 (16.8); UFU10...

CONSUMO HÍDRICO DO MANJERICÃO POR MEIO DE LISÍMETRO DE DRENAGEM PATRICIA ANGÉLICA ALVES MARQUES¹; JEFFERSON VIEIRA JOSÉ2; HERMES SOARES DA ROCHA3; EUSÍMIO FELISBINO FRAGA JÚNIOR4; DANIEL ALVES SOARES5 E SERGIO NASCIMENTO DUARTE¹ 1 Professor(a), Departamento de Engenharia de Biossistemas, Escola Superior de Agricultura “Luiz de Queiroz”, Universidad...

In Brazil soybean is planted in different regions with very different rainfall patterns. Thus, this study aimed to study the water stress caused by both deficit such as excess. The experiment was conducted at the Biosystems Engineering Department-ESALQ/USP in Piracicaba – SP, December 2011 to March 2012. A greenhouse was built, equipped with 44 dra...

The wetted area fraction is a factor critical to the success of drip irrigation. This study aimed to evaluate the effect of partial soil wetting on transpiration, vegetative growth and root system of young orange trees. The experiment was carried out in a greenhouse where plants were grown in 0.5 m3 boxes internally divided into compartments. The w...

Most studies on measures of transpiration of plants, especially woody fruit, relies on methods of heat supply in the trunk. This study aimed to calibrate the Thermal Dissipation Probe Method (TDP) to estimate the transpiration, study the effects of natural thermal gradients and determine the relation between outside diameter and area of xylem in 'V...

This paper had as objective to build and to calibrate weight lysimeters of low capacity and to establish comparisons between the working status of constant level water table lysimeters. Two weight lysimeters of 15-L and 50-L and two constant level water table lysimeters of 15-L and 50-L were built at Embrapa Mandioca & Fruticultura Irrigation and F...

This paper had as objective to build and to calibrate weight lysimeters of low capacity and to establish comparisons between the working status of constant level water table lysimeters. Two weight lysimeters of 15-L and 50-L and two constant level water table lysimeters of 15-L and 50-L were built at Embrapa Mandioca & Fruticultura Irrigation and F...

The present research aimed to accomplish a comparison between the reference method of estimation of evapotranspiration, Penman-Monteith, considered as the standard method by FAO, with Penman-Piché method, which uses measurements of the evaporation from the Piché's evaporimeter. The period from January 2003 to December 2008 was analyzed considering...

RESUMO: Com o aumento dos custos das adubações nas lavouras cafeeiras, deve-se procurar aperfeiçoar ao máximo a utilização da adubação, para o melhor aproveitamento pelas plantas e maior redução de custos de produção. Na adubação do cafeeiro, o elemento nitrogênio é o que mais sofre perdas desde o momento da sua aplicação. O objetivo deste trabalho...

RESUMO: Com o objetivo que gerar informações técnicas para serem utilizadas na engenharia de irrigação, foi conduzida a avaliação de dois emissores de irrigação localizada, denominados microjets, que foram submetido a testes no Laboratório Tecnologia Aplicada das Faculdades Associadas de Uberaba (FAZU) – MG. Foram realizadas as avaliações de vazão...