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<p>Unburned sugarcane harvesting has become a reality in Brazil, bringing impacts on sugarcane cultivation that are still not fully understood. This study evaluates the long-term impact (32&#xa0;years) of different sugarcane harvesting systems—burned (B), unburned (U), and their alternation—on crop productivity, juice and stalk technological parameters, and soil micronutrient and organic carbon (OC) levels. The experiment, initiated in 1989, covered four cultivation cycles in Espírito Santo—Brazil. The experimental area comprised five blocks with four plots. Treatments included unburned harvesting, burned harvesting, and their alternations during the cycles. Evaluations were carried out in 2021, on the 5th ratoon of the fourth cycle. Productivity and technological quality of the juice and stalk were analyzed. Soil samples were collected at different depths and analyzed for OC content and the micronutrients B, Cu, Fe, Mn and Zn. Harvesting method combinations did not affect the productivity of dry leaves, tops, or stalks, nor the technological parameters. Average B and Fe contents were adequate, while Cu, Mn, and Zn were below recommended levels. The contents of Cu, Fe and Mn varied significantly between harvesting systems. While the harvesting systems over 32&#xa0;years did not influence the productivity and technological parameters of the crop, the levels of micronutrient, except for B and Zn, and OC were affected by the different harvesting approaches. Although burned systems showed some positive responses, their continued use is not recommended due to environmental concerns. Sustainable alternatives should be prioritized to ensure long-term soil health and sugarcane viability.</p>

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Impact of a long-term sugarcane harvesting system on crop performance, micronutrient availability, and soil organic carbon in tableland soils of Linhares-ES, Brazil

  • 期刊论文

  • 发表日期：

    2025年5月21日

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  • Giovane Leal de Souza Silva,
  • Margarida Gorete Ferreira do Carmo,
  • Eduardo Lima

摘要

Unburned sugarcane harvesting has become a reality in Brazil, bringing impacts on sugarcane cultivation that are still not fully understood. This study evaluates the long-term impact (32 years) of different sugarcane harvesting systems—burned (B), unburned (U), and their alternation—on crop productivity, juice and stalk technological parameters, and soil micronutrient and organic carbon (OC) levels. The experiment, initiated in 1989, covered four cultivation cycles in Espírito Santo—Brazil. The experimental area comprised five blocks with four plots. Treatments included unburned harvesting, burned harvesting, and their alternations during the cycles. Evaluations were carried out in 2021, on the 5th ratoon of the fourth cycle. Productivity and technological quality of the juice and stalk were analyzed. Soil samples were collected at different depths and analyzed for OC content and the micronutrients B, Cu, Fe, Mn and Zn. Harvesting method combinations did not affect the productivity of dry leaves, tops, or stalks, nor the technological parameters. Average B and Fe contents were adequate, while Cu, Mn, and Zn were below recommended levels. The contents of Cu, Fe and Mn varied significantly between harvesting systems. While the harvesting systems over 32 years did not influence the productivity and technological parameters of the crop, the levels of micronutrient, except for B and Zn, and OC were affected by the different harvesting approaches. Although burned systems showed some positive responses, their continued use is not recommended due to environmental concerns. Sustainable alternatives should be prioritized to ensure long-term soil health and sugarcane viability.