Determinação dos nutrientes (c e n) da biomassa microbiana oriundos do experimento de replicagem de Terra Preta, no município de Tailândia-Pa

Abstract

Based on the understanding of the formation process and attributes of Terra Preta Arqueológica (TPA) soils, studies for the development of technologies in the replication of Terra Preta Nova (TPN) are in progress in northeastern Pará, using the addition to the soil of organic waste found in large scale, such as sawmill waste associated with waste from slaughterhouses and coal. Biological attributes, such as microbial biomass is a sensitive indicator of the differences in sustainability of production systems, depending on soil management. Thus, it is possible to analyze the degradation of organic compounds through the change in microbial biomass. The objective of this work is to evaluate the effect of different management systems in these soils through the quantification of total soil carbon content and microbial biomass carbon. The study was developed in the municipality of Tailândia, which is located in the state of Pará, in the microregion of Tomé-Açu, in northeastern Pará, about 218 km from Belém. For the implementation of this project, waste coal (C), saw dust (RPS), ground blade (RLT), bones (RA), blood + fat (S)and witness (B)were used permuted in 17 plots, at depths of 0-5 cm and 5-15 cm. Organic carbon content was determined by the Walkley-Black method and microbial biomass carbon (MBM) was evaluated by the fumigation-extraction method. The soil organic carbon showed in the 1st collection, highest concentration in the RPS+RLT+ RA mixture treatment with 13.0 g C kg-I of soil and lowest in treatment B with 4.0 g C kg: ' of soil C; 5thcollection, the highest content was verified in the RPS+RLT treatment with 11.43 g C kg-Iof soil and lowest in the C+RPS+RA treatment with 5.04 g C kgl of soil, and in the 8thcollection, highest concentration in the C+ RLT treatment with 9.63 g C kgl of soil and lowest in the RLT treatment with 4.94 g C kgl of soil. Regarding the BOD data, these showed great variability, a factor related to the heterogeneity and low stabilization of the residues. Therefore, the performance of different types of residues, it is noted that the combinations directly favor the increase of both the soil organic carbon content and the BOD, characterizing that these residues are being used properly for the experiment of TPN.