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Com o objetivo de avaliar os fatores produtivos da variedade de mamoneira IAC Guarani (Ricinus communis L.), sob diferentes lâminas de irrigação, foi instalado um ensaio em uma área experimental da Universidade Federal do Ceará, no município de Fortaleza (03°44'S; 38°33'W; 19,5 m). A semeadura foi feita em covas, espaçadas de 1,0 x 1,0 m. Durante o ciclo da mamoneira, as plantas foram irrigadas diariamente, por gotejamento. As lâminas de irrigação foram quantificadas a partir da evaporação medida no tanque classe "A" (ECA). O delineamento experimental foi em blocos ao acaso com cinco tratamentos: 25%, 50%, 75%, 100% e 125% da ECA, com quatro repetições. A colheita foi realizada em três etapas à medida que os racemos de 1ª, 2ª e 3ª ordens foram amadurecendo e secando. Foram avaliados os seguintes fatores produtivos: peso de 100 sementes e produtividades dos racemos de 1ª, 2ª e 3ª ordens e total. As lâminas de irrigação influenciaram o peso de 100 sementes e as produtividades dos racemos de 2ª e 3ª ordens e total. A irrigação com base na lâmina estimada de 105,5% da evaporação medida no tanque classe "A" proporcionou a maior produtividade total.Palavras-chave: Ricinus communis L., manejo de irrigação, tanque classe "A", biodiesel Effects of different irrigation depths on the productivity of castor bean plant of IAC Guarani variety AB S TR ACTAiming to evaluate the production factors of variety of castor bean plant IAC Guarani (Ricinus communis L.) under different irrigation depths, an experiment was installed in the Federal University of Ceará, in the city of Fortaleza (03°44'S; 38°33'W; 19.5 m). The sowing was made in hill spacing of 1.0 x 1.0 m. During the mamoneira cycle, plants were drip irrigated daily with irrigation depths quantified based on the evaporation measured in the Class A Evaporation Pan (ECA). The experiment was allocated in a randomized block design with five treatments (25%, 50%, 75%, 100% and 125% of ECA) and four replications. The harvest was carried out in three stages in proportion that the racemes of 1 st , 2 nd and 3 rd orders were ripened and dried. The following productive factors were evaluates: weight of 100 seeds and productivities of racemes of 1 st , 2 nd and 3 rd orders and total of racemes. The irrigation depths influenced the weight of 100 seeds and the productivities of racemes of the 2 nd and 3 rd orders and total of racemes. The irrigation based on the depth estimated from 105.5% of evaporation measured in Class "A" Pan produced the largest total productivity.

The objective of this study was to evaluate the growth of forest species under conditions of salinity and water deficit. The experimental design was completely randomized in a triple factorial scheme with four forest species (Neem - Azadirachta indica A. Juss, ‘Aroeira’ - Myracrodruon urundeuva Fr Allemão, ‘Ipê’ - Tabebuia impetiginosa (Mart. ex. DC.) Standl and ‘Sabiá’ - Mimosa caesalpiniifoliaBenth), two salinity levels (1.2 and 8.6 dS m-1) and two water regimes (with and without water restriction). Plant height, stem diameter, number of leaves, shoot dry matter, root dry matter and total dry matter were measured. For all the studied variables, there was statistical significance for the factors species (A) and salinity (B), individually. However, water deficit (Factor C) and the interaction among factors (A x B x C) did not cause any statistical effect. The 50% reduction in water replacement for the four species studied was not enough to cause significant damage to plant growth, with a mean reduction in dry matter production lower than 10%. It was observed that the tolerance index found varied according to the imposition of the stresses, being caused mainly by salinity. Based on shoot dry matter production, the species Neem behaved as moderately tolerant, while the other species were moderately sensitive to salinity. The applied water deficit was not enough to intensify the effects of the salt stress under the conditions of the present study.

PRODUÇÃO E QUALIDADE DA ABÓBORA MARANHÃO SOB INFLUÊNCIA DE LÂMINAS DE IRRIGAÇÃO E DOSES DE NITROGÊNIO   RÔMULO UCHÔA BEZERRA1; THALES VINÍCIUS DE ARAÚJO VIANA2; BENITO MOREIRA DE AZEVEDO2; JOÃO VALDENOR PEREIRA FILHO3 E ALAN DINIZ LIMA4   1Departamento de Engenharia Agrícola - DENA, Universidade Federal do Ceará – Campus do Pici – CE, Avenida Mister Hull, s/n, CEP: 60455-760, Fortaleza, Ceará, Brasil, romuloub85@gmail.com; 2 Professores do Curso de Pós-Graduação em Engenharia Agrícola da Universidade Federal do Ceará – Campus do Pici – CE, Avenida Mister Hull, s/n, CEP: 60455-760, Fortaleza, Ceará, Brasil, thales@ufc.br; benito@ufc.br; 3 Professor do curso de Bacharelado em Engenharia Agronômica da Universidade Estadual do Piauí – Campus Cerrado do Alto Parnaíba – PI, Rua Almir Benvindo, s/n, Bairro Aeroporto, CEP: 64860-000, Uruçuí, Piauí, Brasil, joao_valdenor@hotmail.com; 4 Professor do curso de Bacharelado em Engenharia Agrícola e Ambiental da Faculdade Terra Nordeste – FATENE – CE, Rua Coronel Correia, 1119, Centro, CEP 61600-000, Caucaia, Ceará, Brasil, alandinizlima@yahoo.com.br.     1 RESUMO   A cultura da abóbora vem se destacando no cenário mundial devido a crescente preocupação com a questão do desafio alimentar e sua característica de produção associada a pequenas propriedades. São escassas as informações na literatura acerca das respostas da abóbora ao manejo da irrigação associada a adubação nitrogenada. Objetivou-se neste trabalho avaliar o desempenho produtivo (número, massa fresca, massa seca e produtividade) e os parâmetros de qualidade (diâmetro, comprimento, espessura da polpa e °Brix dos frutos) da cultura da abóbora sob lâminas de irrigação associadas a doses de adubo nitrogenado. Adotou-se o delineamento de blocos casualizados em parcelas subdivididas, onde nas parcelas estavam inseridas o fator doses de nitrogênio (50; 70; 100; 125% kg de N ha-1) e nas subparcelas as lâminas de irrigação (50; 75; 100; 125% da evaporação medida no tanque classe A - ‘ECA’) com quatro repetições. A pesquisa foi conduzida em campo na área experimental da Estação Meteorológica pertencente a Universidade Federal do Ceará. A produtividade máxima alcançada foi de 4269,6 kg ha-1 obtido com a combinação da lâmina de água de 444,10 mm (122,5% da ECA) e do nível de nitrogênio de 33,65 kg ha-1 de N (112,16 % do recomendado de N).   Palavras-chave: jerimum de leite, adubação, manejo da irrigação.     BEZERRA, R. U.; VIANA, T. V. de A.; AZEVEDO, B. M. de; PEREIRA FILHO, J. V.; LIMA, A. D. PRODUCTION AND QUALITY OF MARANHÃO PUMPKIN UNDER INFLUENCE OF WATER DEPTHS AND NITROGEN DOSES     2 ABSTRACT   The pumpkin crop is becoming outstanding in  the world scenario due to growing concern with the issue of food challenge and its production characteristic associated with small properties. There is little information in the literature about pumpkin responses to irrigation management associated with nitrogen fertilization. The objective of this work was to evaluate productive performance (number, fresh weight, dry weight and productivity) and quality parameters (diameter, length, pulp thickness and ° Brix of the fruits) of pumpkin culture under irrigation levels associated with doses of nitrogen fertilizer. A randomized complete block design was used in subdivided plots, where the nitrogen dose factor (50; 70; 100; 125% kg of N ha-1) was inserted in the plots and in the subplots, irrigation depths  (50; 75; 100; 125% of evaporation measured in tank class A - 'ECA') with four replicates. The research was conducted in the experimental area of the Meteorological Station belonging to the Federal University of Ceará. The maximum productivity reached was 4269.6 kg ha-1 obtained with the combination of water blade of 444.10 mm (122.5% of ECA) and nitrogen level of 33.65 kg ha-1 of N (112.16% of the recommended N).   Keywords: milk jerimum, fertilization, irrigation management.