O efeito da aplicação da água residuária nos teores de carbono e nitrogênio em planossolo nátrico no Semiárido Paraibano.

• Ano de defesa: 2016
• Autor(a) principal: Almeida, Flávio Rangel dos Santos
• Tipo de documento: Dissertação
• Tipo de acesso: Acesso aberto
• Idioma: por
• Instituição de defesa: Universidade Federal da Paraíba; Brasil; Solos e Engenharia Rural; Programa de Pós-Graduação em Ciência do Solo; UFPB
• Palavras-chave em Português: Efluente doméstico; Substâncias húmicas; Fertilidade do solo; Nitrato; CNPQ::CIENCIAS AGRARIAS::AGRONOMIA
• Link de acesso: https://repositorio.ufpb.br/jspui/handle/123456789/15515

The application of wastewater has great potential in agriculture as it is an alternative source of water and provides nutrients. However, research related to its effects on C and N forms in soil is still incipient. In this context, the objective of this research was to evaluate the effect of the application of reuse water on C and N forms in a Planossolo Nátrico. The experiment was carried out in a subdivided plots scheme with repeated measures in time and space, two sampling times (before and after application of wastewater) and two sampling layers (0-15 and 15-30 cm), totalizing four treatments, with four blocks. The wastewater was applied by dripping once a week, at a flow rate of 14 L plant-1. For principal component analysis (PCA), two groups were formed, distinguishing the times of application of waste water and the layers of 0-15 cm 15-30 cm. The following soil chemical attributes were analyzed: total organic carbon (COT), water soluble carbon (CSA), carbon associated with fulvic acid (C-AF), carbon associated with humic acid (C-AH), carbon associated with humina (C-HU), total nitrogen (NT), nitrate (NO3-), ammonium (NH4 +) and alkaline extract (EA) C-AF / COT, C-AH / COT, C-HU / CT and EA / COT. The use of wastewater increased the content of the organic matter in the soil as well as the N-nitric levels in the soil, but the contents of all variables analyzed did not differ in relation to the layers 0-15 cm and 15-30 cm, being an indication of the improvement of the chemical properties of the soil.