Interação urina e efluente doméstico na produção do milheto cultivado em solos do semiárido paraibano

Abstract

A necessidade precípua de estudos que abordem o aproveitamento de resíduos líquidos na irrigação de culturas em condições semiáridas, é evidente. Buscou-se, com o presente trabalho, analisar a viabilidade do aproveitamento da urina humana diluída em efluente doméstico (0; 1,5; 3,0 e 4,5%) na irrigação de plantas de milheto cultivadas em três solos (Luvissolo, Neossolo e Planossolo) oriundos de áreas degradadas do Núcleo de Desertificação dos Cariris, PB. Esses tratamentos foram distribuídos em um delineamento inteiramente casualizado, analisado em esquema fatorial 4 x 3 + 6, ou seja, quatro diluições de urina em efluente doméstico, três tipos de solo e seis testemunhas (utilizando-se água de abastecimento municipal na irrigação das plantas com e sem aplicação de NPK nos três solos estudados), com quatro repetições, totalizando 72 unidades experimentais. Concluiuse que a adição de 4,5% de urina humana no efluente doméstico aplicado via irrigação em plantas de milheto cultivadas em Luvissolo crômico, proporciona resultados de massa de grãos e eficiência do uso da água semelhante ao observado em plantas com fertilização mineral recomendada e irrigadas com água de abastecimento.Interaction of urine and domestic effluent on production of millet grown in soils of semiarid of Paraiba A B S T R A C TThe imminent need of studies that address the use of liquid residue in irrigation of crops grown in semi-arid conditions is evident. In this context, the feasibility of the use of human urine diluted in domestic effluent (0, 1.5, 3.0 and 4.5%) for the irrigation of plants of millet cultivated in three soils (Luvisol, Neossol and Planossol) collected from degraded areas of the Nucleus of Desertification of Cariris, PB was studied. These treatments were distributed in a completely randomized design, analysed in a factorial 4 x 3 + 6, four urine dilutions in domestic effluent, three types of soil and six controls (using water of municipal supply in the irrigation of the plants with and without application of NPK with four replications, totalizing 72 experimental plots. It was concluded that the addition of 4.5% of human urine in domestic effluent applied in irrigation of the plants of millet cultivated in chromic Luvisol, provides results of viable grain mass and efficiency of water use similar to observed in plants under recommended doses of mineral fertilizer and irrigated with water of municipal supply. Palavras-chave:reúso irrigação desertificação

Contents of macronutrients and growth of ‘BRS Marataoã’ cowpea fertigated with yellow water and cassava wastewater

“…Araújo et al (2015b) studied the cultivation components of hydroponic green fodder of corn fertilized with human urine as source of nutrients. Santos Júnior et al (2015) evaluated grain and phytomass production in millet irrigated with human urine associated with domestic effluent. Bonvin et al (2015) studied N and P absorption by ryegrass fertilized with synthetic urine.…”

Farmers’ Perceptions on the Agricultural Use of Human Urine in the Central Amazon

“…A study in Hawaii found satisfying results when asking if human waste could be used as fertilizer, where 92% of the participants answered affirmatively-despite the fact that no historical evidence of the use of human urine as a fertilizer exists for Hawaii (where the study took place) (Lamichhane & Babcock 2013). In Brazil, we identified some studies conducted on corn (Araújo et al 2015), lettuce (Chrispim & Nolasco 2012) and millet (Santos Júnior et al 2015) with promising results and good applicability potential, but none were conducted in Amazonas state.…”