Effect of Sugarcane Biochar on Hydrological Changes in Soils with Different Textures in Arid Regions: From Improvement to Hydrophobicity Effects

Document Type : Original Article

Author

Department of soil science, Collage of Agriculture, Bu-Ali Sina University

10.30466/asr.2026.56320.1894

Abstract

Improving water efficiency in agriculture requires enhancing soil physical and hydraulic properties. This study investigated the effect of applying sugarcane biochar at three rates (0%, 3%, and 6% by weight) on the hydraulic properties of soils with three textures: sandy loam, loam, and clay loam. The experiment was conducted as a factorial arrangement in a completely randomized design. The results showed that biochar application significantly altered soil physical and hydraulic parameters; however, the magnitude and direction of these changes depended on soil texture and biochar levels. Biochar increased both saturated and residual moisture content across all three soil textures, likely due to the placement of biochar particles (smaller than 2 mm) in the spaces between soil particles, partially blocking some pores and expanding micro- and meso-pores. This effect was more pronounced in clay loam soils, where the application of 6% biochar resulted in an 8% increase in saturated moisture content and a 31% increase in residual moisture content. Conversely, saturated hydraulic conductivity increased in sandy loam and loam soils by 42% and 5%, respectively – especially under the 6% biochar treatment – due to enhanced pore connectivity and a more porous structure. In contrast, in clay loam, saturated hydraulic conductivity decreased by 46%, likely due to higher soil compaction and potential pore blockage by biochar particles. Biochar also increased total porosity, primarily through the expansion of meso- and macro-pores. In sandy loam, the increase in macropores was consistent with improved hydraulic conductivity, whereas in clay loam, increased porosity was mainly due to fine and medium pores, contributing more to water retention than infiltration. At higher application levels (6%), the hydrophobic effect of biochar led to reductions in the water retention curve parameters, including α and n in the van Genuchten model, indicating a decline in the initial water absorption rate, especially in sandy soils. Overall, by improving soil structure, biochar can be recommended as an effective strategy for agricultural water management, especially in arid regions.

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