Soil enzymatic activity and chemical attributes after continuous and interrupted application of pig slurry

Abstract

The objective of this work was to evaluate enzymatic activities and chemical attributes of a soil under continuous application for 28 years and after interruption for 5 and 12 months of pig slurry (PS). The soil received doses of 0, 30 and 60 m 3 ha-1 year-1 of PS since 1988, and in 2016, the plots were divided in half and there was interruption of the application of PS in half plot, generating a 2 × 2 factorial scheme, being two doses of PS (30 and 60 m 3 ha-1 year-1) and two application conditions (continuous or interrupted). The available P, total organic carbon (TOC), pH, Al 3+ , H + + Al 3+ , Ca 2+ , Mg 2+ and K + and activity of the enzymes arylsulfatase (AR), β-glycosidase (β-G), acid (AP) and basic (BP) phosphatase , hydrolysis of fluorescein diacetate (FDA) of soil were assessed. The content of P, Mg 2+ and H + + Al 3+ varied with the doses of PS applied, but not with the interruption of the applications. The continuous application of PS increased the activity of the enzymes AR, β-G and BP, whereas FDA and AP were not influenced by the interruption of the applications. The interruption of PS application for up to one year did not change the chemical attributes of the soil, but reduces the activity of the enzymes AR, β-G and BP.

Soil attributes and microbial diversity on 28 years of continuous and interrupted for 12 months of pig slurry application

“…The samples were composed of three soil subsamples in each of the three replicates from the treatment and collected at the 0.0-0.1, 0.1-0.2 and 0.2-0.4 m depths. For more information about experimental design, soil sampling and soil chemical attributes, see Navroski et al (2019).…”

“…One of the alternatives for PS recycling is the use as organic fertilizer as it can provide essential nutrients to plants, increase the soil organic matter (SOM) content (Plaza et al, 2004;Couto et al, 2013) and enable greater activity and diversity of microorganisms (Marschner et al, 2003;Balota et al, 2014;Li et al, 2015;Navroski et al, 2019). Authors have observed that the use of organic fertilizers increased the diversity of microorganisms compared to mineral fertilizers or without fertilizer (Zhen et al, 2014;Li et al, 2015;Faissal et al, 2017).…”