Organic Matter Fractions and Carbon Management Index in Oxisol Under Integrated Agricultural Production Systems

Carlos Augusto Rocha De Moraes Rego,Marinez Carpiski Sampaio,Jean Sérgio Rosset,Paulo Sérgio Rabello De Oliveira,Juan López De Herrera,Eloisa Mattei,Jeferson Tiago Piano,Jonas Francisco Egewarth

doi:10.5296/jas.v8i3.16325

Abstract

This work aimed to evaluate the oxidizable and chemical fractions of organic matter and the carbon management index in different integrated agricultural production systems, hay production and native forest areas in an Oxisol. Nine areas with different management systems were evaluated being six managements of the combination between different oat density (40 and 60 kg ha-1) and grazing frequencies (0, 1 and 2) in autumn-winter and soybean succession in spring-summer, one with natural reseeding ryegrass and forage turnip in autumn-winter and soybean succession in spring-summer and two reference areas. In each soil management systems were collected soil samples composite in the 0-5, 5-10 and 10-20 cm layers and determined the Total Organic Carbon (TOC), humic substances (Fulvic Acids - FA, Humic Acids - HA and humin - HUM), the carbon in the oxidizable fractions (F1, F2, F3 and F4) and Carbon Management Index (CMI). Were observed that chemical, oxidizable fractions and CMI, do not have significant differences between with the various managements each other. For TOC, HA, HUM, F1, F3, F4 and CMI, the managements did not differ from the reference areas indicating maintenance of soil carbon.

Highlights

The conversion of natural vegetation to the implantation of agricultural activities causes an imbalance in the ecosystem, since the adopted management will influence the physical, chemical and biological processes of the soil
The development of management strategies based on conservation of soil environment, such as integrated agricultural production systems (IAPS), are aimed at the sustainable intensification
During spring-summer periods, soybean was cultivated with base fertilization of 270 (2014/2015), 290 (2015/2016) and 310 (2016/2017) kg ha-1 of commercial formulation 02-20-18 (N, P2O5 and K2O) and phytosanitary treatments carried out according to the need of the crop

Summary

Introduction

The conversion of natural vegetation to the implantation of agricultural activities causes an imbalance in the ecosystem, since the adopted management will influence the physical, chemical and biological processes of the soil. In this way, the understanding of the performance of different soil management systems allows us to subsidize strategies for the maintenance of its long-term effects, in order to guarantee the sustainability and the quality of natural resources (Rossi et al, 2012; Rosset et al, 2016). This is based on the spatial and temporal integration of productive components, whose purpose is to achieve higher stages of environmental quality and competitiveness, reducing the pressure on the opening of new areas and contributing to soil improvement (Cordeiro et al, 2015)

Objectives

Methods

Results