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Sewage discharge into rivers cause troubles by deteriorating water quality, mainly in the semi-arid region. The agriculture reuse of wastewater is an alternative to minimize environmental problems, provide nutrients and part of water requirements to crops. The purpose of the current study was to verify the influence of raw sanitary wastewater (ARB) and tertiary treated sanitary wastewater (ART) replacing potassium topdressing in cotton fertigation, investigating changes in the yield and fiber quality indexes of cotton NuOpal BG RR®. The field experiment was developed in Janauba, Minas Gerais State, Brazil, in randomized complete block design with five treatments (T0: drinking water and mineral fertilizer; T1 and T2: 100% and 150% of potassium topdressing requirements supplied by ART; T3 and T4: 100% and 150% of potassium topdressing supplied by ARB) and four replications. The T1 do not change cotton yield and fiber quality, once nitrogen topdressing is performed. The ARB not affect cotton fiber quality and improve yield by 43.6%, being unnecessary nitrogen topdressing.

Indicadores de produção e qualidade da fibra do algodoeiro fertirrigado com água residuária sanitária