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The mixture of carboxylic acids present in petroleum oil and directly responsible for its acidity and corrosiveness in liquid phase during the refine process is denominated "naphthenic acids". These acids are also present in distilled fraction of petroleum, causing several problems in final products quality. A possible way to remove the carboxilic acids from petroleum distilled fractions is the adsorption in porous materials. However, the results obtained until now indicate that ion exchange resins would be the best adsorbents for this process, which would probably increase its cost. In this work, two commercial adsorbents (clay and activated alumina) were characterized by a set of physical-chemistry techniques and evaluated concerning their capacity of removing naphthenic acids from a light petroleum fraction. It was verified the influence of a thermal treatment previous to the adsorption in its physical-chemistry characteristics and its properties. A high reduction of the TAN values was verified in the residual oils from both adsorbent, although there was a competition among all the compounds present in the light oil fraction for the adsorption sites, which can be probably related to the thermal pre-treatment. These results were related to corrosion yield experiments, and it was observed that the adsorbent pretreatment also affected the reduction in corrosion yields for both alumina and clay

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RESUMOObjetivou-se com este trabalho instalar e operar lisímetros de drenagem para determinar o coeficiente de cultivo (Kc) da cultura do pimentão na região Agreste DETERMINATION OF THE CROP COEFFICIENT OF SWEET PEPPER (Capsicum anuum) BY MEANS OF DRAIN LYSIMETER ABSTRACTThe objective of the work installed and operate drainage lysimeters to determine the crop coefficient (Kc) of the sweet pepper crop in the Agreste region of the state of Alagoas. The

USO RACIONAL DA ÁGUA E DA ADUBAÇÃO NITROGENADA NO MILHO (Zea Mays L.) IRRIGADO POR GOTEJAMENTO EM CULTIVO DE OUTONO/INVERNO1     PAULO FERREIRA DA SILVA2; MARCOS ANTONIO LIODORO DOS SANTOS3; JOÃO VICTOR RIBEIRO DA SILVA DE SOUZA4; DOUGLAS MARCELO PINHEIRO DA SILVA5; JÉSSICA MAIARA DE SOUZA FERRARI6 E JOÃO CARLOS CURY SAAD7   1 Trabalho retirado da tese intitulada:” Manejo da irrigação e da adubação nitrogenada no milho cultivado no outono/inverno em Botucatu-SP”, do autor Paulo Ferreira da Silva2 2 Doutor em Agronomia Irrigação e Drenagem, Rua Elpídio Coelho, 427, Centro, 64750-000, Paulistana, PI, Brasil, e-mail: pauloagrom@gmail.com 3 Doutor em Agronomia, Departamento de vendas e projetos, Irrimar irrigação e serviços LTDA, Av. Antares 720, Recanto dos Vinhais, 65070-070, São Luís, MA, Brasil, e-mail: marcos.liodorio@irrimar.com.br 4 Doutor em Agronomia Irrigação e Drenagem, Departamento de Engenharia rural, FCA - UNESP, Rua José Barbosa de Barros, 1780, Fazenda Lageado, 18603-970, Botucatu, SP, Brasil, e-mail: joao.vrsp@gmail.com 5 Professor Doutor, Instituto de Educação Agricultura e Ambiente, Universidade Federal do Amazonas, Rua 29 de Agosto, 786, Centro. 69800-000, Humaitá, AM, Brasil, e-mail: douglassilva@ufam.edu.com 6 Mestre em Agronomia Irrigação e Drenagem, Faculdade de Ciências e Engenharia, UNESP, Rua Domingos da Costa Lopes, 780, Jardim Itaipu, 17602-496, Tupã, SP, Brasil, e-mail: jessicamaiaraferrari@gmail.com 7 Professor Doutor, Departamento de Engenharia Rural e Socioeconomia, FCA - UNESP, Av. Universitária, 3780, Altos do Paraíso,18610-034, Botucatu, SP, Brasil, e-mail: joao.saad@unesp.br     1 RESUMO   Este estudo foi realizado para investigar o efeito da irrigação e doses de fertilizante nitrogenado sobre a produtividade do milho cultivado entre os meses de abril a outubro de 2016 e 2017. O experimento foi conduzido na Fazenda Lageado na área experimental localizada nas coordenadas geodésicas 22°51'07" Sul, 48°25'45,07" Oeste e altitude de 764 m. A acidez do solo foi corrigida com calcário dolomítico apenas no ano de 2016 e a semeadura realizada no espaçamento de 0,85 x 0,20 m entre as linhas e plantas, respectivamente, com adição de 300 kg de NPK 04-30-10 aplicado no sulco. O delineamento experimental usado foi em blocos casualizados, em esquema fatorial 5 x 5, com parcela subdividida sendo cinco níveis de irrigação correspondendo a 50, 75, 100, 125 e 150% da evapotranspiração diária da cultura (ETc) e cinco doses de adubação nitrogenada nos níveis 0, 22,5, 45, 67,5 e 90 kg ha-1 de N, utilizando a uréia como fonte de N em quatro repetições. A produtividade de grãos de milho foi maior utilizando a lâmina com 100% da ETc nos anos de 2016 e 2017. Para o fator adubação nitrogenada, o maior rendimento foi obtido no nível utilizando 90 kg ha-1 de N.   Palavras-chave: economia de água, irrigação suplementar, produtividade de grãos     SILVA, P. F; SANTOS, M. A. L; SOUZA, J. V. R. S.; SILVA, D. A. P.; FERRARI, J. M. S.; SAAD, J. C. C. RATIONAL USE OF WATER AND NITROGENATED FERTILIZATION IN CORN (Zea Mays L.) IRRIGATED BY DRIPPING IN AUTUMN / WINTER CULTIVATION     2 ABSTRACT   This study was carried out to investigate the effect of irrigation and nitrogen fertilizer doses on the productivity of corn grown between April and October 2016 and 2017. The experiment was conducted at Fazenda Lageado in the experimental area located at geodetic coordinates 22°51'07" South, 48°25'45.07" West and altitude of 764 m. The soil was corrected with dolomitic limestone only in 2016 and the sowing carried out at a spacing of 0.85 x 0.20 m between the lines and plants, respectively, with the addition of 300 kg of NPK 04-30-10 applied in the furrow. The experimental design used was randomized blocks, in a 5 x 5 factorial scheme, with a subdivided plot with five levels of irrigation corresponding to 50, 75, 100, 125 and 150% of the daily culture evapotranspiration (ETc) and five doses of nitrogen fertilization at levels 0; 22.5; 45; 67.5 and 90 kg ha-1 of N, using urea as a source of N in four replications. The productivity of corn grains was higher using depth with 100% ETc in the years 2016 and 2017. For the nitrogen fertilization factor, the highest yield was obtained at the level using 90 kg ha-1 of N.                                                             Keywords: water saving, supplementary irrigation, grain yield