Just Accepted

This article has been peer reviewed and accepted for publication. It is in production and has not been edited, so may differ from the final published form.

Soil carbon, organic matter fractions, and soil physical quality under different sugarcane harvesting systems in northeastern of Brazil

Handerson Lima , Sávio Borges, Crislâny Santos , Stoécio Maia

Abstract

Context. Sugarcane cultivation is one of the main agricultural activities in Brazil. Among the production systems, unburnt harvesting has gained prominence and has been replacing the burning system. The use of unburnt harvesting system increases straw retention on soil surface, which influences the quantity and quality of soil organic matter (SOM). Aims. Evaluate the effects of burnt and unburnt sugarcane harvesting systems on soil organic carbon (SOC) stocks and SOM dynamics in the northeast region of Brazil. Methods. The study was conducted at three sites, each containing one area of burnt sugarcane harvesting system (Bs), two areas of unburnt sugarcane harvesting systems (Us) and one area of native vegetation (NV), totaling 12 collection sites. Key results. The results show that the conversion of NV to sugarcane cultivation areas led to SOC loss, which ranged from 7% to 62%, and reduced soil quality due to losses of particulate organic matter (POM) and increased soil bulk density (BD), being corroborated by changes in other indicators, such as soil degree of compactness (SDC), and reduction in the soil structural stability index (SSI). Conclusions. Despite the losses when compared to NV, the Us system showed increments in SOC, POM-C, and SSI and reductions in BD and SDC compared to Bs. Implications. The findings of this study highlight the importance of understanding the impact of land-use change on the properties of SOM.

SR24152  Accepted 12 December 2024

© CSIRO 2024