Efectos del lodo residual y residuos orgánicos vermicoposteados sobre indicadores inorgánicos y catalasa

Abstract

This study evaluated inorganic indicators and enzymatic activity of three mixtures of vermicompost made with cow manure (EB), domestic waste (RD), sewage sludge (LR) and soil (Cambisol), to know its maturity. Treatments were mixed with, cow manure and domestic waste in a relationship to 1: 1 (T1), 3: 1 (T2) and 100 % of cow manure (T3), in addition all treatments were added the equivalent of 40 Mg/ha of LR. Laboratory analyses were made following the NOM 004 and 021 of SEMARNAT. The results before making vermicomposting for RD, EB and LR indicate that heavy metals did not exceed the NOM-004 (2002) norm. The C/N ratio was appropriate indicate and is according to reported by Yang et al. (2014). For treatments it was adequate moisture (less than 72 %) and showed a slightly alkaline pH behavior (7.93). The Corg for T2 and T3 showed higher content (12.84 and 12.88 %) respectively, compared to T1 (8.90 %). Total N ranged from 0.73 and 1.03 being the most value for T1. The C/N ratio indicates stabilization treatment according to the NMX-FF-109-SCFI (2007) norm, being to T3 and T2 respectively 14.14 and 17.48 and 8.78 for T1. Catalase was between 0.61±0.15 to 0.81± 0.015 µmol H2O2 g-1h-1 where most activity was showed in T3, wit these data, we concluded that T1 is considered the best option for agriculture use.