ABSTRACT:In order to provide scientific information about the irrigated cauliflower production in Northeast of Para, an experiment was installed in the Federal Rural University of Amazonia farm with the Desert hybrid under different water tensions on the ground and boron doses in the municipality of Igarapé-Açu -PA. The experimental design was a randomized block in a 4 x 4 factorial, sixteen treatments with three replications. The treatments consisted of four water tensions on the ground (15, 30, 45 and 60 kPa) as an indicative of the time to irrigate and four boron doses (0, 2, 4 and 6 kg ha -1 ). The irrigation was performed with drippers and irrigation management with tensiometers. Each plot, 4 m 2 , consisted of 8 plants located in the spacing of 1.0 m between lines and 0.5 m between plants. The hybrid is promising for cultivation in the soil and climatic conditions of the region where it was evaluated, with productivity of 17.1 t ha -1 , fresh mass of the inflorescence of 0.85 kg plant -1 , inflorescence diameter of 18 cm, in 38 kPa tension. The optimal dose of boron which ensured greater production of dry mass was 3 kg ha -1 .
Viabilidade econômica da produção de couve-flor irrigada por gotejamento no Nordeste Paraense Economic viability of cauliflower production drip irrigated in Northeast Paraense Contribuição dos autores: Michel Emerson Martins Pereira conduziu o experimento, a análise estatística e a redação do artigo; Joaquim Alves de Lima Junior supervisionou e acompanhou todas as etapas, além das análises estatísticas e redação do artigo; Valdeides Marques Lima contribuiu com a revisão bibliográfica e a redação do artigo; Sérgio Antonio Lopes de Gusmão contribuiu com a revisão bibliográfica e a redação do artigo; Pedro Daniel de Oliveira colaborou com revisão ortográfica, gramatical e redação científica. André Luiz Pereira da Silva contribuiu com a redação do artigo e com a revisão ortográfica e gramatical Agradecimentos: Ao Conselho Nacional de Pesquisa e Desenvolvimento Científico e Tecnológico (CNPq), pelo suporte e financiamento, e
Conflito de interesse: Os autores declaram não haver conflito de interesse.
Quantitative assessments of the population density of the microbial community in soils are important to establish ecological relationships that occur in the soil and to identify factors that influence the management of agroecosystems. Therefore, the objective was to quantify the cellulolytic fungi present in the soils of three use and management systems in the Amazon. The studied areas consisted of intercropped cultivation with gliricidia, orange and banana; area with orange and forest essence and native forest area. In each area, soil samples were collected at depths of 0-10 and 10-20 cm, placed in sterile plastic bags, duly identified, and stored in a thermal box and later in a cold chamber (4 ºC). The quantification of cellulolytic organisms was obtained by suspending the soil, using a specific culture medium. The cultures were incubated in a B.O.D oven at 28°C for 37 days. The estimate of the number of viable cells was made using the most likely number (MPN). The results show that the soil with the gliricidia, orange and banana intercropping has a higher population of cellulolytic microorganisms, this group is strongly influenced by the local vegetation cover, thus proving to be an alternative for intercropping systems with agricultural crops, providing a greater biodiversity of microorganisms in the soil, in addition to helping to provide nutrients for the species.
VIABILIDADE ECONÔMICA DO CULTIVO DE MAMÃO FERTIRRIGADO SOB DIFERENTES DOSES DE POTÁSSIO VALDEIDES MARQUES LIMA1; JOAQUIM ALVES DE LIMA JUNIOR2; ANTONIA BENEDITA DA SILVA BRONZE3; EUGÊNIO FERREIRA COELHO4; ROSSINI DANIEL5 E LIDIANE DE SOUZA SILVA6 1Extensionista rural I da Empresa de Assistência Técnica e Extensão Rural do Estado do Pará (EMATER-PA), BR 316, km 12, 67.200-970, Marituba, Pará, Brasil, valdeides.lima2017@gmail.com. 2Professor da Universidade Federal Rural da Amazônia (UFRA), Campus Capanema, Rua Barão de CapanemaCentro, 68700-700, Capanema, Pará, Brasil, joaquim.junior@ufra.edu.br . 3Professora da Universidade Federal Rural da Amazônia (UFRA), Campus Belém, Avenida Presidente Tancredo Neves, Terra Firme, 66077-830, Belém, Pará, Brasil antonia.silva@ufra.edu.br 4Pesquisador da Embrapa Mandioca e Fruticultura (CNPMF), Rua Embrapa S/N, Chapadinha, 44380000 - Cruz das Almas, Bahia, Brasil, eugenio.coelho@embrapa.br. 5Professor da Universidade Federal Rural da Amazônia (UFRA), Campus Paragominas, Rodovia PA-256, Nova Conquista, 68627-451, Paragominas, Pará, Brasil rossini.daniel@ufra.edu.br 6Extensionista rural I da Empresa de Assistência Técnica e Extensão Rural do Estado do Pará (EMATER-PA), BR 316, km 12, 67.200-970, Marituba, Pará, Brasil, lidiagro@hotmail.com. 1 RESUMO O Brasil possui uma atuação de destaque no mercado nacional e internacional de produção de mamão. Para otimizar esta produção, faz-se necessário o uso de tecnologias como a de fertirrigação. Todavia, compreender a viabilidade econômica de tal tecnologia é de suma importância para estimular seu uso. Nesse contexto, o objetivo do presente trabalho foi avaliar a viabilidade econômica do cultivo do mamão fertirrigado sob diferentes doses de potássio. A fertirrigação ocorreu por meio de sistema de irrigação por gotejamento, com gotejadores apresentando vazão de 1,4 L h-1. O experimento foi instalado em Igarape-açú, no nordeste do Pará. A metodologia utilizada para aferir a viabilidade econômica do cultivo de mamão fertirrigado é uma adaptação de trabalhos anteriores. A partir da análise realizada, verificou-se que o uso da fertirrigação por meio de um sistema de irrigação por gotejamento, aplicando-se uma dose de 480 kg K2O ha-1, resultou em fluxo de caixa com valor presente líquido (VPL) de R $ 27.806,33, uma taxa interna de retorno (TIR) de 48,10% e uma relação benefício/custo (B/C) de 2,01. Portanto, para um hectare de mamão fertirrigado com doses de potássio, nas condições edafoclimáticas observadas, a produção com adoção da tecnologia fertirrigação por gotejamento, constitui-se numa opção viável. Palavras-chave: fruticultura, lucratividade, quimigação, fertirrigação. LIMA, M. L.; LIMA JUNIOR, J. A.; BRONZE, A. B. S.; COELHO, E. F.; DANIEL, R.; SILVA, L. DE S. ECONOMIC FEASIBILITY OF FERTIGATED CULTIVATION OF PAPAYA SUBMITTED TO DIFFERENT DOSES OF POTASSIUM 2 ABSTRACT Brazil has an outstanding performance in the national and international market of papaya production. To optimize this production, the use of technologies such as fertigation is necessary. However, understanding the economic viability of this technology is of paramount importance to stimulate its use. In this context, the objective of this study was to evaluate the economic viability of fertigated papaya under different doses of potassium. Fertigation was done by drip irrigation system, with drippers presenting a flow rate of 1.4 L h-1. The experiment was installed in Igarape-açú, in the northeast of Pará. The methodology used to assess the economic viability of fertigated cultivation of papaya is an adaptation of previous works. From the analysis performed, it was found that the use of fertigation through a drip irrigation system, applying a dose of 480 kg K2O ha-1, resulted in a cash flow with a net present value (NPV) of R$ 27,806.33, an internal rate of return (IRR) of 48.10%, and a benefit/cost ratio (B/C) of 2.01. Therefore, for one hectare of fertigated papaya with doses of potassium, under the observed edaphoclimatic conditions, the production with the adoption of the drip fertigation technology, it constitutes in a viable option. Keywords: fruit growing, profitability, chemigation, fertigation.
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