Rusle parameters for modeling the loss of a soil subjected to pig slurry application

Maria Aparecida Do Nascimento Dos Santos,Danieli Schneiders Kaufmann,Bárbara Bagio,Ildegardis Bertol,José Mecabô Júnior

doi:10.1590/s0100-204x2018001000010

Abstract

Abstract: The objective of this work was to determine adjustment parameters for the revised universal soil loss equation (Rusle) of a soil subjected to pig slurry application. Treatments consisted of 0, 50, 100, and 200 m3 ha-1 pig slurry (PS), after the cultivation of black oat (Avena strigosa), besides the application of 50 m3 ha-1 PS for six times onto the soil surface in a temporal sequence, and a control treatment of soil without cultivation and without pig slurry application. The evaluations were performed for black oat shoot dry mass, root mass and crop residues semi-incorporated into the soil (RMR), soil losses by means of simulated rain, and the parameters for water erosion modeling. The pig slurry application onto soil surface caused a reduction in the values of the soil consolidation parameter (Cf), an increase in the mass of living and dead roots and cultural residues incorporated in the upper layer (0.0-0.1 m) of the soil (Bu), and a reduction in the subfactor prior land use (PLU) of the Rusle.

Highlights

The pig slurry (PS) farming stands out in the Brazilian socioeconomic scenario generating countless jobs and income in the producing regions
The yield of black oat shoot dry matter (DM) was 3.24, 2.99, 2.07, and 1.82 Mg ha-1, in the treatments CD200, CD100, CD50, and CD0, respectively, evidencing the PS effect (Figure 1), in which DM was 78% higher in the CD200 treatment than in the CD0. This effect was further evidenced by the 14% increase of DM in the CD50, in comparison to CD0, whose results are in agreement with those found by Steiner et al (2009)
The DM decomposed throughout the study time (Figure 1), and the estimated values indicate an exponential decrease of 94%, regardless of the PS dose applied

Summary

Introduction

The pig slurry (PS) farming stands out in the Brazilian socioeconomic scenario generating countless jobs and income in the producing regions. The country has a herd of about 39 million animals, with approximately 48% of the production concentrated in the Southern region (ABPA, 2016). In Santa Catarina, the hog population is composed of 5.5 million animals, distributed mainly in the south and west of the state, and producing 47.000 m3 per day of pig slurry (PS) (Produção..., 2014). The main use of PS generated during the production cycle is its application onto the soil as a fertilizer for crop and pasture, to complement or replace mineral fertilizers recommended by fertilization programs (Agne & Klein, 2014). There is a concern about the dose to be used and its influence on the soil attributes (Arruda et al, 2010). Continued or excess PS can cause environmental damage, such as soil pollution (Condé et al, 2012), increased runoff, and sediment transport (Oliveira et al, 2015)

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Conclusion