Nitrogen supply to arugula from pig slurry composts in contrasting soils

Luanna Corrêa Monteiro ,Celso Aita,Cristian Mateus Freiberg,Ana Paula Mezzalira,Sandro José Giacomini,Janquieli Schirmann,Stefen Barbosa Pujol ,Kathleen Da Silva Paust ,Diego Antônio Giacomini

doi:10.1590/s0102-053620190407

Abstract

ABSTRACT This study was developed to evaluate nitrogen (N) supply to arugula from composts produced by automated composting of pig slurry (PS). During the composting process, retorted oil shale (ROS) and dicyandiamide (DCD) were added to PS to mitigate gaseous N losses. The study was developed in a greenhouse where four treatments were evaluated, three with compost addition (PS compost, PS compost + ROS, and PS compost + ROS + DCD) and one without compost (control) in two contrasting soils (clayey and sandy-loam). The best result was obtained with the compost without additives (PS compost), which increased the arugula dry matter yield 2.2 times in clayey soil and 6.1 times in sandy-loam soil compared to the control treatment. The presence of ROS in composts reduced arugula dry matter yield in 27% in clayey soil and 35% in sandy-loam, while DCD did not affect arugula dry matter yield. The results of this study show that the addition of ROS to PS during composting reduces N supply to arugula, both in the immediate (first cut) and residual effect (second cut).

Highlights

Fornecimento de nitrogênio à rúcula por compostos de dejetos de suínos em solos com características contrastantes
There is a lack of researches investigating the agricultural use of composts obtained by automated composting of pig slurry (PS), as this process had been recently introduced in Brazil (Doneda, 2014)
This study aimed to evaluate how the addition of retorted oil shale and dicyandiamide to PS during automated composting affects N supply to arugula in two soils with contrasting characteristics

Summary

Introduction

Fornecimento de nitrogênio à rúcula por compostos de dejetos de suínos em solos com características contrastantes. O estudo foi desenvolvido para avaliar o fornecimento de nitrogênio (N) à rúcula através de compostos obtidos por compostagem automatizada de dejetos líquidos de suínos (DLS). Nitrogen supply to arugula from pig slurry composts in contrasting soils t ha-1 in the second crop (residual effect) corresponding to an increase of 0.94 and 1.39 t ha-1 relative to the control, respectively. These yields are higher than those found by Parizotto & Pandolfo (2009), which ranged from 0.25 to 0.75 t ha-1 with increasing doses (0, 10, 20 and 40 t ha-1) of a compost obtained by traditional composting method. It is important to evaluate the N supply potential of the compost obtained with automated composting

Objectives

Methods

Results