Brazilian Archives of Biology and Technology
versión impresa ISSN 1516-8913
NOGUEIRA, Sandra Furlan et al. Water type and irrigation time effects on microbial metabolism of a soil cultivated with Bermuda-grass Tifton 85. Braz. arch. biol. technol. [online]. 2011, vol.54, n.3, pp. 477-786. ISSN 1516-8913. http://dx.doi.org/10.1590/S1516-89132011000300007.
This study investigated the microbial metabolism in Bermuda-grass Tifton 85 areas after potable-water and effluent irrigation treatments. The experiment was carried out in Lins/SP with samples taken in the rainy and dry seasons (2006) after one year and three years of irrigation management, and set up on an entirely randomized block design with four treatments: C (control, without irrigation or fertilization), PW (potable water + 520 kg of N ha-1 year-1); TE3 and TE0 (treated effluent + 520 kg of N ha-1 year-1) for three years and one year, respectively. The parameters determined were: microbial biomass carbon, microbial activity, and metabolic quotient. Irrigation with wastewater after three years indicated no alteration in soil quality for C and ET3; for PW, a negative impact on soil quality (microbial biomass decrease) suggested that water-potable irrigation in Lins is not an adequate option. Microbial activity alterations observed in TE0 characterize a priming effect.
Palabras llave : reuse; irrigated agriculture; microbial respiration; Cmic; qCO2.