Soil carbon and physical-mechanical properties after successive applications of swine and poultry organic waste

José Alcides Soares De Freitas,Vanderlei Rodrigues Da Silva,Anderson Luiz Zwirtes,Felipe Bonini Da Luz,Douglas Rodrigo Kaiser

doi:10.1590/1983-40632018v4852412

Abstract

ABSTRACT In agricultural crops, the use of swine and poultry waste as organic fertilizers results in gains in the productivity and reduction of production costs, but it may also change the physical properties and mechanical behavior of the soil, either increasing or reducing its quality. This study aimed to investigate the influence of applying increasing doses of liquid swine manure (160 m³ ha-1 year-1, 320 m³ ha-1 year-1 and 480 m³ ha-1 year-1) and poultry litter (6 Mg ha-1 year-1, 12 Mg ha-1 year-1 and 18 Mg ha-1 year-1), along four years, on the physical-mechanical properties and organic carbon content of a very clayey Rhodic Eutrudox. The application of liquid swine manure and poultry litter increased the surface soil organic carbon contents. The soil density decreased, whereas the total porosity and macroporosity increased, with the addition of liquid swine manure and poultry litter. There were no significant changes in the soil susceptibility to compaction.

Highlights

The Brazilian production of pork and poultry meat and by-products is prominent in the world scenario, and has shown a marked increase in the last decades, becoming economically and socially important for the country
Soil carbon and physical-mechanical properties after successive applications of swine and poultry organic waste 391 swine manure and poultry litter in the fertilization of agricultural crops such as maize, bean, soybean and wheat (Cassol et al 2012, Sartor et al 2012), which have shown a great potential as fertilizers, justified by the macro and micronutrient levels found in that waste (CQFS-RS/SC 2016)
This study aimed to investigate the influence of applying increasing doses of liquid swine manure and poultry litter on the physicalmechanical properties and organic carbon content of a very clayey Rhodic Eutrudox

Summary

Introduction

The Brazilian production of pork and poultry meat and by-products is prominent in the world scenario, and has shown a marked increase in the last decades, becoming economically and socially important for the country. The organic waste generated by the swine and poultry production chain are, respectively, liquid swine manure (consisting of feces, urine, water, feed remains, hair bristles, dusts and other materials) and poultry litter (usually consisting of wood shavings or rice husks and feathers, feed remains, animal waste and skin flakes) (Silva et al 2011). In this regard, several studies have investigated the use of. Few studies have investigated the effects of such organic waste on the soil mechanical properties (i.e., penetration resistance, preconsolidation pressure and compression ratio) and its relationship with the organic carbon content, especially for a long period of time, requiring a greater attention from agricultural researchers

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Conclusion