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Phosphorus fertilizer coated with polysaccharide-enriched extracts from the red seaweed Schizymenia dubyi for slow release and water retention

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Abstract

The present study investigates the feasibility of using polysaccharide enriched extracts (PEEs) from the red seaweed Schizymenia dubyi as coating materials in the preparation of controlled release triple superphosphate (TSP) fertilizers. Initially, the polysaccharide was isolated, extracted, and further characterized by gas chromatography and infrared analysis to determine its chemical composition and its partial structure. Results of chemical and spectroscopic analysis indicated that galactose, glucuronic acid, and glucose were the main components of the polysaccharide with a molecular weight of 2805 KDa. It can be suggested that this polysaccharide could be a sulfated glucuronogalactan. After that, the viscosity of the coating polysaccharide solution at different concentrations was conducted to determine the low and high polysaccharide concentrations that can be easily sprayed. After the spray coating process using different concentrations (1.8% and 2.5% w/v) and application cycles (from C1 to C4), the resulting coated fertilizer beads were chiefly characterized in terms of morphology, release kinetics in water and soil, and water retention properties. Results of the phosphorus release kinetics in water showed an effective effect for the slow release behaviour of the fertilizer. Increasing the concentration of the matrix additionally delays the release of P, and the best results were obtained with the formulation 2.5% -C4 which released 75% P after 5 to 7 days versus 2 days for the uncoated TSP. The same tendency was also recorded in soil release kinetics and weight losses. The soil water retention was also improved with the coated fertilizers, with over 4% more water retention than the uncoated fertilizers over 28 days. These findings showed that the polysaccharide-coated TSP fertilizer had multiple agronomic features and could be a promising candidate for various potential applications in agriculture.

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Data availability

The datasets generated during and/or analysed during the current study are available from the corresponding author on reasonable request.

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Funding

This work is funded by OCP Group as a project between OCP Innovation, Mohammed VI Polytechnique University and MAScIR Foundation. Special thanks to the members of the different laboratories involved in this study for their support during the execution of the experiments.

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Authors and Affiliations

  1. Composites and Nanocomposites Center (CNC), Moroccan Foundation of Advanced Science Innovation and Research (MAScIR), Rue Mohamed Al Jazouli Madinat Al Irfane, 10100, Rabat, Morocco

    Mohamed El Mehdi Mekhzoum, Abou el kacem Qaiss & Rachid Bouhfid

  2. Plant & Microbial Biotechnology, Moroccan Foundation for Advanced Science, Innovation and Research (MAScIR) Rabat Design Center, Rue Mohamed Al Jazouli, Madinate Al Irfane, 10100, Rabat, Morocco

    Abderrahim Aasfar, Abir Mzibra, Najib El Mernissi & Issam Meftah Kadmiri

  3. Department of Plant Production, Protection and Biotechnology, Hassan II Institute of Agronomy and Veterinary Medicine, Madinate Al Irfane, BP 6446, 10100, Rabat, Morocco

    Abir Mzibra

  4. Situation Innovation Group - OCP Group, Casablanca, Morocco

    Youssef Farrie

  5. Research & Development Center, OCP Group Jorf Lasfar, Mohammed VI Polytechnic University, BP 118, El Jadida, Morocco

    Mehdi Khouloud & Rachid Boulif

  6. Mohammed VI Polytechnic University, Lot 660 Hay Moulay Rachid, 43150, Ben Guerir, Morocco

    Abou el kacem Qaiss & Rachid Bouhfid

  7. Microbiome Program, AgroBioSciences, Mohammed VI Polytechnic University, Ben Guerir, Morocco

    Issam Meftah Kadmiri

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  1. Mohamed El Mehdi Mekhzoum
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  2. Abderrahim Aasfar
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Mekhzoum, M., Aasfar, A., Mzibra, A. et al. Phosphorus fertilizer coated with polysaccharide-enriched extracts from the red seaweed Schizymenia dubyi for slow release and water retention. J Appl Phycol 35, 935–948 (2023). https://doi.org/10.1007/s10811-023-02927-y

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