Abstract
The objective of this study was to evaluate the pig slurry application effects on chemical attributes of a Hapludox soil managed under no-tillage system. Treatments consisted of 50, 100 and 200 m³ ha-1 per year of pig slurry application, and a control with replacement of P and K exported through harvested grains. Attributes related to soil chemical reaction, exchange complex, and nutrient contents were determined in soil samples collected in the ninth year of experimentation from 0 - 0.025, 0.025 - 0.05, 0.05 - 0.10, 0.10 - 0.20, 0.20 - 0.40 and 0.40 - 0.60 m soil depths. The continuous application of high doses of pig slurry on the Oxisol surface under no-tillage acidifies the soil and increases Al, P, Cu, and Zn contents down to 0.2-m depth, and K levels down to 0.6-m depth.
Highlights
Physical and chemical composition of pig slurry (PS) varies among farms and production systems, but it seems to be a close relationship between PS dry matter and its phosphorus or nitrogen contents (Scherer et al, 1996)
The objective of this study was to evaluate the pig slurry application effects on chemical attributes of a Hapludox soil managed under no‐tillage system
The experiment was installed at field, managed with crop rotation and no‐tillage for more than 10 years, with the following soil attributes at the 0–0.20 m soil depth: 5.8 pH in water; 45 g kg‐1 soil organic matter; 0.0, 0.5, 4.7, and 2.9 cmolc dm‐3 of exchangeable Al, K, Ca and Mg respectively; and 10.0, 10.5 and 1.7 mg dm‐3 of extractable P, Cu and Zn (Mehlich 1), respectively
Summary
Physical and chemical composition of pig slurry (PS) varies among farms and production systems, but it seems to be a close relationship between PS dry matter and its phosphorus or nitrogen contents (Scherer et al, 1996). These authors determined that about 66% N, 33% P and almost all K in PS were in the mineral fraction. The effects of the continued application of PS on soil chemical properties are relatively well known, especially on macronutrient cycling, organic matter contents, and pH. The continued application of PS usually results in increased levels of nutrients in the soil, but has little effect on the content of organic matter (OM) and soil pH (Scherer et al, 2007, 2010; Cassol et al, 2011; Lourenzi et al, 2011).
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