Fertirrigação da bananeira com água residuária sanitária tratada

Abstract

We evaluated the effect of fertirrigation with treated sanitary wastewater from Janaúba Sewage Treatment Plant on 'Prata-Anã' banana. A randomized block design with four replications was used. Four levels of wastewater (70, 130, 170 and 200 % of 150 kg ha¹ of sodium input) were tested. A conventional management (clean water + mineral fertilizers) was performed for comparison. Physical and chemical soil properties, production and yield components of banana, diagnosis of nutritional status, post-harvest quality and microbiological analysis of fruits were evaluated. During the second production cycle, soil macroporosity decreased in deeper layers, with soil organic matter and aggregate stability, besides clay dispersion increased together with treated sanitary wastewater levels. After the first cycle, the wastewater increased soil pH and reduced availability of exchangeable potassium. Wastewater increased levels of sodium and electrical conductivity up to 60 cm depth. Management with wastewater at the end of first production cycle does not influence soil organic matter, phosphorus, calcium, magnesium, potential acidity, base saturation and micronutrients. Wastewater fertirrigation does not change most of leaves nutrients content, showing yield, postharvest and microbiological fruit quality similar to conventional management with mineral fertilizer and clean water.