SOIL RESPIRATION IN BANANA PLANTATIONS FERTIGATED WITH TREATED SANITARY WASTE WATER.

The main objective of this research is to evaluate the CO2 evolution in a Red Eutrophic Latosol (Eutrudox) fertigated with treated sanitary wastewater under "Prata-Anã" banana cultivation. Disturbed soil samples were collected from 0-20 and 20-40 cm soil profile depths. The experimental design was random blocks arranged in split-plots with four replications. The main plot factors were different treated sanitary wastewater doses applied as 130% and 200% compared with the maximum annual soil application limit (150 kg sodium ha-1) and a control treatment (clean water + mineral fertilization). Soil respiration was evaluated on the 7th, 14th, 21st, and 28th days. The assessment of soil respiration at a depth of 0-20 cm indicates that the use of wastewater increases soil respiration by 19.89 and 28.46%, respectively for treatments TSW1 and TSW2 in relation to the control treatment. At a depth of 20-40 cm, the use of the control treatment promotes an exponential reduction in soil respiration, tending to decrease and stabilize at 58.185 mg C-CO2 kg-1 evolved on the 28th day of evaluation. Treatments with wastewater present respiratory behavior in a quadratic behavior, with minimum respiratory values estimated on the 18th day, respectively 83.4 and 54.0 mg evolved C-CO2 kg-1 for treatments TSW1 and TSW2. [ABSTRACT FROM AUTHOR]