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<p>Agriculture today faces the challenge of increasing food production while minimizing the environmental impacts of agricultural practices, particularly the inefficient use of fertilizers. To address this issue, researchers have explored the potential of controlled-release fertilizers (CRFs) capable of releasing nutrients at a controlled rate over an extended period. However, the use of non-biodegradable polymer coatings in many commercial CRFs raises environmental concerns. This study investigates the potential of incorporating Moroccan Ghassoul clay, modified or natural, into fertilizer granules to modulate nutrient release profiles. The unique physicochemical properties of clay minerals potentially grant them the ability to adsorb and release essential nutrients gradually over time. The modification of the ghassoul clay was performed using the pillaring technique, which creates a. complex microstructure that can restrict the transfer of water molecules and nutrients. The characterization of pillared and non-pillared clays was performed using X-ray diffraction (XRD) and Fourier transform infrared spectroscopy (FTIR), providing insights into the influence of pillaring on basal spacing and interlayer structure. The morphological analysis was conducted using scanning electron microscopy (SEM) and energy-dispersive X-ray spectroscopy (EDX). It was found that incorporating pillared clay into fertilizers improved the physical properties of granules compared to those incorporating untreated clay and non-incorporated ones. Nutrient release tests assessed using three phosphatic fertilizers through sand column revealed that the use of untreated clay resulted in faster nutrient release due to its inherent swelling properties, facilitating granule disintegration upon contact with water. In contrast, granules co-granulated with pillared clay exhibited a slower release of nutrients, suggesting increased efficiency under specific conditions. The findings demonstrate the incorporation of clay emerges as an effective strategy for modulating nutrient release rates, whether accelerating or slowing, enabling improved fertilization optimization, and potentially addressing environmental concerns.</p>

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Clay-based modulation of nutrient release: Ghassoul as nutrient carrier for enhanced fertilizer efficiency

  • 期刊论文

  • 发表日期：

    2025年1月7日

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  • Mehdi Khouloud,
  • Khalid Ferji,
  • Jean-luc Six,
  • Redouane Beniazza,
  • Mohammed Lahcini

摘要

Agriculture today faces the challenge of increasing food production while minimizing the environmental impacts of agricultural practices, particularly the inefficient use of fertilizers. To address this issue, researchers have explored the potential of controlled-release fertilizers (CRFs) capable of releasing nutrients at a controlled rate over an extended period. However, the use of non-biodegradable polymer coatings in many commercial CRFs raises environmental concerns. This study investigates the potential of incorporating Moroccan Ghassoul clay, modified or natural, into fertilizer granules to modulate nutrient release profiles. The unique physicochemical properties of clay minerals potentially grant them the ability to adsorb and release essential nutrients gradually over time. The modification of the ghassoul clay was performed using the pillaring technique, which creates a. complex microstructure that can restrict the transfer of water molecules and nutrients. The characterization of pillared and non-pillared clays was performed using X-ray diffraction (XRD) and Fourier transform infrared spectroscopy (FTIR), providing insights into the influence of pillaring on basal spacing and interlayer structure. The morphological analysis was conducted using scanning electron microscopy (SEM) and energy-dispersive X-ray spectroscopy (EDX). It was found that incorporating pillared clay into fertilizers improved the physical properties of granules compared to those incorporating untreated clay and non-incorporated ones. Nutrient release tests assessed using three phosphatic fertilizers through sand column revealed that the use of untreated clay resulted in faster nutrient release due to its inherent swelling properties, facilitating granule disintegration upon contact with water. In contrast, granules co-granulated with pillared clay exhibited a slower release of nutrients, suggesting increased efficiency under specific conditions. The findings demonstrate the incorporation of clay emerges as an effective strategy for modulating nutrient release rates, whether accelerating or slowing, enabling improved fertilization optimization, and potentially addressing environmental concerns.