Zinc and copper fractions in Oxisols of different textures fertilized with pig slurry

Sulamirtes S De A Magalhães,Oscarlina L Dos S Weber

doi:10.1590/1807-1929/agriambi.v25n6p386-392

Sulamirtes S De A Magalhães, Oscarlina L Dos S Weber

Open Access

https://doi.org/10.1590/1807-1929/agriambi.v25n6p386-392

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Abstract

HIGHLIGHTS Higher concentrations of exchangeable Zn were found in areas with pig slurry application. No higher concentrations of Cu were found in the exchangeable fraction in areas using pig slurry. In all study areas, it was observed that more than 70% of Cu is in recalcitrant forms.

Highlights

The use of organic residues as a source of nutrients for crops has increased over the years, including pig slurry (PS) due to its biofertilizer potential
This study aimed to evaluate the zinc and copper fractions in Oxisols of different textures submitted to successive applications of pig slurry
The soils in areas with and without pig slurry use showed a predominance of Cu in the not available form

Summary

Introduction

The use of organic residues as a source of nutrients for crops has increased over the years, including pig slurry (PS) due to its biofertilizer potential. PS applications for long periods can contaminate soil and surface and subsurface waters due to the high concentration of trace elements, such as copper (Cu) and zinc (Zn) contained in the waste (Couto et al, 2015). High Cu and Zn levels are present in the PS due to excessive amounts of these elements in the pigs’ diets since approximately 85% of the Cu, and 98% of the Zn are excreted in the feed, quantities above the physiological requirement of this animal species (Smanhotto et al, 2010). The Zn and Cu distribution estimation in different soil fractions is obtained by sequential extraction methods in which it is possible to separate the bioavailable (exchangeable), potentially bioavailable (linked to oxides, carbonates, and organic matter), and residual or not available (mineral structure) fractions. There is no standardization of sequential extraction schemes and several modifications are being carried out, the use of this method allows inferences about the form, flow, mobility, and transport of metals in soils (Tessier et al, 1979)

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