Crescimento e qualidade microbiológica de alface cultivada com soluções de urina de vaca

• Ano de defesa: 2013
• Autor(a) principal: Magalhães, Wemerson Geraldo
• Orientador(a): Puiatti, Mário
• Banca de defesa: Casali, Vicente Wagner Dias , Sediyama, Maria Aparecida Nogueira , Borges, João Tomaz da Silva
• Tipo de documento: Tese
• Tipo de acesso: Acesso aberto
• Idioma: por
• Instituição de defesa: Universidade Federal de Viçosa
• Programa de Pós-Graduação: Doutorado em Fitotecnia
• Departamento: Plantas daninhas, Alelopatia, Herbicidas e Resíduos; Fisiologia de culturas; Manejo pós-colheita de
• País: BR
• Palavras-chave em Português: Lactuca sativa; Produção; Micro-organismos; Contaminação
• Palavras-chave em Inglês: Lactuca sativa; Production; Microorganisms; Contamination
• Área do conhecimento CNPq: CNPQ::CIENCIAS AGRARIAS::AGRONOMIA::FITOTECNIA
• Link de acesso: http://locus.ufv.br/handle/123456789/1216

The cow urine applied to lettuce (Lactuca sativa L.) has promoted the growth and production of leaves. However, questions have been raised regarding the microbiological contamination. The study aimed to evaluate the effect of solutions of cow urine on plant growth characteristics and microbiological quality of lettuce. Four experiments were conducted in IFMG - Campus São João Evangelista MG. Experiments 1 and 2 were carried out from November 2011 to February 2012 and the experiments 3 and 4 in the period August to November 2012. The experiments were conducted in greenhouse under organic cropping system. Experiments 1 and 2 consisted of five treatments, corresponding to concentrations of cow urine solutions of 0.0, 0.5, 1.0, 2.0 and 4.0%, conducted in a completely randomized design with five replications. In experiment 1, the application of the solutions was foliar and in experiment 2 was in the soil, both with lettuce 'Regina 2000'. Experiments 3 and 4 were made up of five treatments, solutions corresponding to concentrations of 0.0, 2.0, 4.0, 6.0 and 10%, conducted in a completely randomized design with four replications. In both, the application of foliar solution was only in experiment 3 the lettuce was the 'Regina 500' and in experiment 4 Lettuce was 'Babá de Verão'. The solutions were prepared with the same water used for irrigation, and the control received only water. In all the experiments were applied 60 mL of solution/plant. This volume was divided into five applications, starting seven days following transplantation of seedlings, applying respectively 5, 5, 10, 20 and 20 mL/plant. The plot consisted of four longitudinal rows of 1.75 m long, with plants spaced 0.25 x 0.25 m. The six central plants from the two central rows were considered useful. Were evaluated the production of lettuce and microbiological analysis of irrigation water, the cow urine stored, the solutions applied cow urine, lettuce washed and not washed in pure water. Qualitative data were subjected to analysis of variance. The data on the concentration of the solutions were subjected to regression analysis, using the t test, the 1% and 5% probability. Solutions cow urine applied foliar or soil, the concentration of up to 5.21%, promoted plant growth and yield of lettuce. Solutions cow urine applied to soil, up to a concentration of 4%, and foliar up to 10%, did not improve the microbial load in lettuce. The cow urine in sealed plastic bombona kept in the dark showed growth of micro- organisms total coliforms, fecal coliforms and aerobic mesophilic until around the 5th week, dropping dramatically and reaching zero, or close to it, in the 7th week. The irrigation water had a high microbial load and was largely responsible for the microbial load on the lettuce, and the simple washing of lettuce leaves with pure water, although reducing the microbial load, was not effective for reducing this burden to acceptable levels for diners.