Influence of the cultivation system on the activity of sulfohydrolase in bean (Phaseolus vulgaris) cultivation

Abstract

Arylsulfatase is an enzyme that participates in the S cycle in soil by hydrolyzing sulfate ester-like bonds, which releases sulfate ion. These processes are important in the catalysis of different reactions necessary for stabilization, structuring of the microbial communities in the soil. The objective of this work was to evaluate the enzymatic activity of arylsulfatase in two systems: conventional and organic beans in the Fazenda Escola UEMA in the rainy season in the municipality of São Luís, MA. Sampling consisted of 9 replicates per area, totaling 18 samples composed by subsamples, determination of sulfohydrolase activity followed procedures of Tabatabai and Bremner, for the statistical analysis was applied a test of Tukey to 5%. The enzymatic activity did not present a significant statistical difference, however the conventional system had a lower median than the organic system. The conventional system due to lower amount of organic matter, addition of chemicals and soil disturbance interfered negatively in this enzyme.