The present work aimed to analyze the viability of gray water use on bromatological quality of millet cv. Ceará (Pennisetum glaucum). The experiment was carried out in the greenhouse, on the department of agronomic and forestry sciences at the Federal Rural University of the Semi-Arid-UFERSA, Mossoró, RN, Brazil. The experimental design used was randomized blocks with five treatments and six replications, totaling thirty plots. The experiment was carried out in vases with the volume of 25 L containing four plants per vase. The treatments consisted in five dilutions of TGW in WW: T1-100% WW plus 0% TGW; T2-75% WW plus 25% TGW; T3-50% WW plus 50% TGW; T4-25% WW plus 75% TGW and T5-0% WW plus 100% TGW. It was analyzed dry matter, ashes, fibers in neutral and acid detergents, nitrogen and protein indigestible in acid detergent and crude protein. From the presented results, it can be concluded that the dilution that promoted better bromatological quality was treatment T3 with 50% of treated gray water plus 50% of well water, however, forage production irrigated only with treated gray water shown to be used in semiarid regions.
Análise do desempenho de gotejadores não autocompensantes operando com esgoto sanitário tratado Analysis of the performance of non self-compensing dripper operating with treated sanitary sewage
ResumoDevido a grave crise hídrica que cresce cada vez mais em todo mundo se faz necessário à busca por soluções voltadas para o aproveitamento dos recursos hídricos, neste cenário o Brasil, assim como vários países, enfrenta problemas típicos de uma sociedade em desenvolvimento em relação à falta de água. A reutilização de efluente na agricultura é uma estratégia na preservação dos recursos hídricos, além de atender locais onde a água é escassa e secas prejudicam as lavouras. O objetivo deste presente trabalho é avaliar a uniformidade de distribuição de efluente em unidades gotejadoras com e sem aplicação de catalisador enzimático. Foram montadas duas bancadas experimentais em área localizada na Universidade Federal Rural do Semi -Árido (UFERSA), para avaliação, a cada 80h, do desempenho hidráulico e do entupimento de quatro tipos de gotejadores, aplicando água residuária doméstica tratada (ARDT), perfazendo um total de 400h. Foi calculado o coeficiente de uniformidade de distribuição (CUD) como indicador de desempenho hidráulico. O experimento foi montado em esquema de parcelas subsubdivididas, tendo nas parcelas quatro níveis de tratamento com catalisador, nas subparcelas quatro tipos de gotejadores, e nas subsubparcelas seis períodos das avaliações. Em cada tempo, foram feitas análises físico-químicas e microbiológicas da ARDT. Os resultados indicaram a ocorrência de interação entre os tratamentos, tipos de gotejadores e tempos de funcionamento estudados. Os valores do CUD oscilaram ao longo do período de funcionamento do sistema de irrigação. As alterações no CUD ocorreram em função do tempo de operação e da presença de agentes físico-químicos, que propiciaram entupimento parcial dos gotejadores.Palavras-Chave: Reúso, irrigação, entupimento.
The present work aimed to analyze the effects of the application of dilutions of treated gray water (TGW) in well water (WW) on growth and production of millet cv. Ceará (Pennisetum glaucum). The experiment was carried out in a greenhouse, on the department of agronomic and forestry sciences, at the Federal Rural University of the Semi-Arid (UFERSA), Mossoró, RN, Brazil. The experimental design was randomized blocks with five treatments and six replications, totaling thirty plots. The experiment was carried out in vases with volume of 25L containing four plants per vase. The treatments consisted in five dilutions of TGW in WW: T1—100% WW plus 0% TGW; T2—75% WW plus 25% TGW; T3—50% WW plus 50% TGW; T4—25% WW plus 75% TGW and T5—0% WW plus 100% TGW. During the experiment it was analyzed the attributes of plant height, number of tillers, number of leaves, stem diameter and total fresh and dry matters. With the results, it was observed that the exclusive irrigation with TGW (T5) promoted better millet development. As the concentrations of TGW increased in dilutions, also increased plant height, number of leaves and tillers. The rise in the number of leaves is associated to the rise in height and tillers, and those are associated to the rise in stem diameter and fresh matter, resulting in better accumulations of dry matter and showing the viability of gray water use to improve forage production and increasing potable water availability to multiple uses.
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