Desenvolvimento inicial do Eucalipto e fertilidade do solo após aplicação de lodo de esgoto e composto de lodo

• Autor(a) principal: Silva, Camila Rocha Pergentino da
• Data de Publicação: 2019
• Tipo de documento: Dissertação
• Idioma: por
• Título da fonte: Repositório Institucional da UNESP
• Texto Completo: http://hdl.handle.net/11449/191692
• topic: Organic fertilization; Urban residue; Mineral nutrition; Adubação orgânica; Nutrição mineral; Resíduo urbano; Nutrição mineral; Eucalyptus grandis; Eucalyptus urophylla

The use of sewage sludge as an organic fertilizer, besides being an alternative for the final disposal of such waste, it may improve the soil properties, since it is a material rich in nutrients and organic matter, which may favor the development of plants. The objective of this work was to verify the effect of doses of sewage sludge and sludge compost in the initial development of a hybrid of Eucalyptus grandis x Eucalyptus urophylla. The experiment was conducted in plastic greenhouse, without environment control, and was composed of 48 vessels containing 50L of dystrophic medium texture. It is a factorial experiment with two factors: organic fertilizer (sewage sludge and sludge compost – both without limestone) and dose (10, 20, 30, 40 and 50 Mg ha-¹ + K), plus two additional treatments (absolute control and mineral fertilization indicated to the species). Each treatment was composed by four repetitions. The height, stem diameter and index of green color were measured monthly, during six months and leaf area, dry matter mass, plant nutrition and soil fertilizer were evaluated at the end of the experiment. The data were subjected to analysis of variance, complemented with tests of multiple comparisons and adjustments of polynomial regression models to evaluate the effect of doses, at 5% level of significance. Both sewage sludge and sludge compost, in the doses of 40 e 50 Mg ha-1 , provided quantities of nutrients to plants and soil, higher than absolute control and greater than or equal to inorganic fertilization but never lower than it, what explain the improvements in the soil fertilizer and in the plants development like higher height, diameter, leaf area and production of dry matter mass when they received these quantities of both of organic fertilizers. So, the sludge and the sludge compost, when used in doses of 40 and 50 Mg ha-1 provided enough quantities of nutrients for plants of Eucalyptus to have an equal to or better initial development than that provided by inorganic fertilization. However, the composted sludge usually provided better results than pure sludge. Thus, for the initial development of Eucalyptus, an average of 45 Mg ha-1 of sludge compost should be applied.