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<p>This study aimed to evaluate the effects of different sources of surface-applied soil acidity amendments, with or without agricultural gypsum, on soil fertility and sugarcane yield in a tropical Typic Hapludox.&#xa0;The experiment was conducted at Usina Bambuí Bioenergia S/A in Bambuí, Minas Gerais, Brazil, over two crop seasons (2019/20 and 2020/21) on ratoon sugarcane, with surface application of dolomitic limestone, hydrated lime (Lime 1), quicklime (Lime 2 and 3), and agricultural gypsum. Soil chemical properties, nutrient uptake from the stalks, yield in tons of stalks per hectare (TSH), and the technological components were evaluated.&#xa0;After two years of application of amendments, significant increases were observed in pH values, base saturation (BS%), and exchangeable calcium (Ca²⁺) and magnesium (Mg²⁺) contents, as well as a reduction in aluminum saturation (AS%), particularly in the 0.00–0.20&#xa0;m layer. The combination of amendments with gypsum enhanced these effects, especially in deeper soil layers. Yield improvements were notable in the second season, with increases ranging from 9.4 to 17 t ha⁻¹ for tons of stalks per hectare (TSH) and 1.6 to 2.6 t ha⁻¹ for tons of sugar per hectare (TSuH). Hydrated lime (Lime 1) and dolomitic limestone were most effective in improving soil fertility, while granulated quicklime (Lime 3) combined with gypsum showed the deepest profile effects.&#xa0;The study highlights the importance of selecting appropriate amendments to optimize soil fertility and sugarcane productivity in acidic tropical soils, demonstrating that surface application, even without incorporation, proved effective in enhancing soil conditions and crop yield.</p>

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Surface Application of Soil Acidity Amendments and Agricultural Gypsum Alter Soil Fertility and Sugarcane Yield

  • 期刊论文

  • 发表日期：

    2025年10月27日

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  • Guilherme Vieira Pimentel,
  • Luiz Daniel Rodrigues da Silva,
  • Silvino Guimarães Moreira,
  • Sérgio Hebron Maia Godinho,
  • Amanda Santana Chales

摘要

This study aimed to evaluate the effects of different sources of surface-applied soil acidity amendments, with or without agricultural gypsum, on soil fertility and sugarcane yield in a tropical Typic Hapludox. The experiment was conducted at Usina Bambuí Bioenergia S/A in Bambuí, Minas Gerais, Brazil, over two crop seasons (2019/20 and 2020/21) on ratoon sugarcane, with surface application of dolomitic limestone, hydrated lime (Lime 1), quicklime (Lime 2 and 3), and agricultural gypsum. Soil chemical properties, nutrient uptake from the stalks, yield in tons of stalks per hectare (TSH), and the technological components were evaluated. After two years of application of amendments, significant increases were observed in pH values, base saturation (BS%), and exchangeable calcium (Ca²⁺) and magnesium (Mg²⁺) contents, as well as a reduction in aluminum saturation (AS%), particularly in the 0.00–0.20 m layer. The combination of amendments with gypsum enhanced these effects, especially in deeper soil layers. Yield improvements were notable in the second season, with increases ranging from 9.4 to 17 t ha⁻¹ for tons of stalks per hectare (TSH) and 1.6 to 2.6 t ha⁻¹ for tons of sugar per hectare (TSuH). Hydrated lime (Lime 1) and dolomitic limestone were most effective in improving soil fertility, while granulated quicklime (Lime 3) combined with gypsum showed the deepest profile effects. The study highlights the importance of selecting appropriate amendments to optimize soil fertility and sugarcane productivity in acidic tropical soils, demonstrating that surface application, even without incorporation, proved effective in enhancing soil conditions and crop yield.