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Plant Science Today (PST)

Research Articles

Vol. 13 No. sp2 (2026): Recent Advances in Agriculture

Aqueous release kinetics of nitrogen and potassium from a citric acid–crosslinked lignosulfonate biopolymer matrix

DOI
https://doi.org/10.14719/pst.14444
Submitted
8 March 2026
Published
27-04-2026

Abstract

Conventional nitrogen and potassium fertilisers exhibit rapid dissolution in aqueous environments, resulting in low utilisation efficiency and significant nutrient losses. In this study, a citric acid–crosslinked lignosulfonate biopolymer matrix containing nitrogen and potassium was synthesised and evaluated for its controlled nutrient-release properties in aqueous media. The biopolymer fertiliser was evaluated against conventional fertilisers (urea and muriate of potash) under varying pH (4.0, 7.0 and 9.0) and temperature (25 °C and 35 °C) and water conditions (distilled and saline at 2 dS m-1). Under neutral conditions, cumulative nutrient release reached 93.73 % for nitrogen and 83.42 % for potassium at pH 7.0, whereas release declined under acidic and alkaline pH conditions due to changes in polymer swelling and nutrient diffusion dynamics. Temperature significantly influenced nutrient release, with maximum cumulative release observed at 35 °C, reaching 97.32 % for nitrogen and 89.12 % for potassium. In contrast, saline water conditions (2 dS m-1) reduced total nutrient release to 76.31 % nitrogen and 72.53 % potassium by day 30. Conventional fertilisers such as urea and muriate of potash (MOP) released more than 99 % of their nutrients within 3 days. Kinetic modelling revealed that nutrient release from the polymer matrix followed anomalous (non-Fickian) transport and was best described by the Korsmeyer-Peppas model. Furthermore, a maize hydroponic bioassay demonstrated improved seedling performance, with 96.23 % germination, longer root and shoot lengths, higher seedling vigour index (SVI) (1673.91) and increased Soil Plant Analysis Development (SPAD) chlorophyll value (39.80). These findings demonstrate the fertiliser’s controlled-release efficiency, environmental safety and potential for precision agriculture.

References

  1. 1. Albahri G, Alyamani AA, Badran A, Hijazi A, Nasser M, Maresca M, et al. Enhancing essential grains yield for sustainable food security and bio-safe agriculture through latest innovative approaches. Agronomy. 2023;13(7):1709. https://doi.org/10.3390/agronomy13071709
  2. 2. Food and Agriculture Organization of the United Nations. Inorganic fertilizers: global trends from 2002 to 2022. Rome: FAO; 2023.
  3. 3. Li J, Han T, Liu K, Shen Z, Daba NA, Tadesse KA, et al. Optimizing potassium and nitrogen fertilizer strategies to mitigate greenhouse gas emissions in global agroecosystems. Sci Total Environ. 2024;916:170270. https://doi.org/10.1016/j.scitotenv.2024.170270
  4. 4. Antip M. Fertilizer market developments. Food Outlook. 2024:11–15.
  5. 5. Akhtar MN, Ul-Haq T, Ahmad F, Imran M, Ahmed W, Ghaffar A, et al. Application of potassium along with nitrogen under varied moisture regimes improves performance and nitrogen-use efficiency of high- and low-potassium efficiency cotton cultivars. Agronomy. 2022;12(2):502. https://doi.org/10.3390/agronomy12020502
  6. 6. Paramesh V, Mohan Kumar R, Rajanna GA, Gowda S, Nath AJ, Madival Y, et al. Integrated nutrient management for improving crop yields, soil properties and reducing greenhouse gas emissions. Front Sustain Food Syst. 2023;7:1173258. https://doi.org/10.3389/fsufs.2023.1173258
  7. 7. Moradi S, Babapoor A, Ghanbarlou S, Kalashgarani MY, Salahshoori I, Seyfaee A. Toward a new generation of fertilizers with the approach of controlled-release fertilisers: a review. J Coat Technol Res. 2024;21(1):31–54. https://doi.org/10.1007/s11998-023-00817-z
  8. 8. Jariwala H, Santos RM, Lauzon JD, Dutta A, Wai Chiang Y. Controlled release fertilizers (CRFs) for climate-smart agriculture practices: a comprehensive review on release mechanisms, materials, methods of preparation and effect on environmental parameters. Environ Sci Pollut Res Int. 2022;29(36):53967–95. https://doi.org/10.1007/s11356-022-20890-y
  9. 9. Abdullahi A, Hussain B, Karadere C, Samancı E, Avcı M, Baş T, et al. Water retention polymers to cope with drought driven by climate change for a sustainable viticulture. Int J Agric Nat Sci. 2024;17(2):223–33.
  10. 10. Drishya PK, Reddy MV, Mohanakrishna G, Sarkar O, Isha, Rohit MV, et al. Advances in microbial and plant-based biopolymers: synthesis and applications in next-generation materials. Macromol. 2025;5(2):21. https://doi.org/10.3390/macromol5020021
  11. 11. Firmanda A, Fahma F, Syamsu K, Suryanegara L, Wood K. Controlled/slow-release fertilizer based on cellulose composite and its impact on sustainable agriculture. Biofuels Bioprod Bioref. 2022;16(6):1909–30. https://doi.org/10.1002/bbb.2433
  12. 12. Chaudhary V, Yeshpal N. Bio-polymer based slow release/control release fertilizer. Res J Agric Sci. 2023;14(5):1234–40.
  13. 13. Kumar R, Naess G, Sørensen M. Slow-release fertilizers using lignin: challenges and future prospects. Biofuels Bioprod Bioref. 2023;17(5):1368–81. https://doi.org/10.1002/bbb.2487
  14. 14. Das A, Saha M, Gupta MK, Rangan L, Uppaluri R, Das C. Comparative efficacy of citric acid/tartaric acid/malic acid additive-based polyvinyl alcohol-starch composite films. J Mater Sci Mater Eng. 2024;19(1):9. https://doi.org/10.1186/s40712-024-00151-1
  15. 15. Lai DS, Osman AF, Adnan SA, Ibrahim I, Ahmad Salimi MN, Mustapha MJ. Thermoplastic starch hybrid biocomposite films with improved strength and flexibility produced through crosslinking via carboxylic acid. J Thermoplast Compos Mater. 2024;37(3):1150–86. https://doi.org/10.1177/08927057231193372
  16. 16. Nzenguet AM, Essamlali Y, Zahouily M, Amadine O. Development and characterization of eco-friendly starch/polyacrylamide/graphene oxide-based slow-release fertilizers for sustainable agriculture. J Polym Res. 2025;32(4):141. https://doi.org/10.1007/s10965-025-04369-1
  17. 17. Xu YF, Shi YZ, Zhang WT, Yu YJ, Yan BL, Xu LY, et al. Control of nitrogen leaching and ammonia volatilisation by developing a kind of humic acid-matrix slow-release urea. J Plant Nutr Fertil. 2024;30(4):801–11. https://doi.org/10.11674/zwyf.2023474
  18. 18. Gutiérrez CA, Ledezma-Delgadillo A, Juárez-Luna G, Neri-Torres EE, Ibanez JG, Quevedo IR et al. Production, mechanisms and performance of controlled-release fertilizers encapsulated with biodegradable-based coatings. ACS Agric Sci Technol. 2022;2(6):1101–25. https://doi.org/10.1021/acsagscitech.2c00077
  19. 19. Bher A, Mayekar PC, Auras RA, Schvezov CE. Biodegradation of biodegradable polymers in mesophilic aerobic environments. Int J Mol Sci. 2022;23(20):12165. https://doi.org/10.3390/ijms232012165
  20. 20. Song Y, Ma L, Duan Q, Xie H, Dong X, Zhang H, et al. Development of slow-release fertilizers with function of water retention using eco-friendly starch hydrogels. Molecules. 2024;29(20):4835. https://doi.org/10.3390/molecules29204835
  21. 21. Yan S, Zhang T, Zhang B, Zhang T, Cheng Y, Wang C, et al. The higher relative concentration of K+ to Na+ in saline water improves soil hydraulic conductivity, salt-leaching efficiency and structural stability. SOIL. 2023;9(1):339–49. https://doi.org/10.5194/soil-9-339-2023
  22. 22. Lipin AA, Lipin AG, Wójtowicz R. Modelling nutrient release from controlled release fertilisers. Biosyst Eng. 2023;234:81–91. https://doi.org/10.1016/j.biosystemseng.2023.08.015
  23. 23. Olad A, Gharekhani H, Mirmohseni A, Bybordi A. Superabsorbent nanocomposite based on maize bran with integration of water-retaining and slow-release NPK fertilizer. Adv Polym Technol. 2018;37(6):1682–94. https://doi.org/10.1002/adv.21825
  24. 24. Zhang Y, Jiao G, Wang J, She D. Preparation of lignin-based slow-release nitrogen fertilizer. Sustainability. 2024;16(23):10289. https://doi.org/10.3390/su162310289
  25. 25. Jackson ML. Soil chemical analysis. New Delhi: Prentice Hall of India Pvt Ltd; 1973.
  26. 26. Irfan SA, Razali R, KuShaari K, Mansor N, Azeem B, Versypt AN. A review of mathematical modeling and simulation of controlled-release fertilizers. J Control Release. 2018;271:45–54. https://doi.org/10.1016/j.jconrel.2017.12.017
  27. 27. Lakshani N, Wijerathne HS, Sandaruwan C, Kottegoda N, Karunarathne V. Release kinetic models and release mechanisms of controlled-release and slow-release fertilizers. ACS Agric Sci Technol. 2023;3(11):939–56. https://doi.org/10.1021/acsagscitech.3c00152
  28. 28. Varma MV, Kaushal AM, Garg A, Garg S. Factors affecting mechanism and kinetics of drug release from matrix-based oral controlled drug delivery systems. Am J Drug Deliv. 2004;2(1):43–57. https://doi.org/10.2165/00137696-200402010-00003
  29. 29. Mendonca Cidreira AC, Wei L, Aldekhail A, Islam Rubel R. Controlled-release nitrogen fertilizers: a review on bio-based and smart coating materials. J Appl Polym Sci. 2025;142(3):e56390. https://doi.org/10.1002/app.56390
  30. 30. Barbi S, Barbieri F, Andreola F, Lancellotti I, Barbieri L, Montorsi M. Preliminary study on sustainable NPK slow-release fertilizers based on byproducts and leftovers: a design-of-experiment approach. ACS Omega. 2020;5(42):27154–63. https://doi.org/10.1021/acsomega.0c03082
  31. 31. Rashad M, Kenawy ER, Hosny A, Hafez M, Elbana M. An environmentally friendly superabsorbent composite based on rice husk as soil amendment to improve plant growth and water productivity under deficit irrigation conditions. J Plant Nutr. 2021;44(7):1010–22. https://doi.org/10.21608/djs.2018.138903
  32. 32. Sultan M, Taha G. Sustained-release nitrogen fertiliser delivery systems based on carboxymethyl cellulose-grafted polyacrylamide: swelling and release kinetics. Int J Biol Macromol. 2024;266:131184. https://doi.org/10.1016/j.ijbiomac.2024.131184
  33. 33. Lawrencia D, Wong SK, Low DY, Goh BH, Goh JK, Ruktanonchai UR, et al. Controlled release fertilizers : a review on coating materials and mechanism of release. Plants. 2021;10(2):238. https://doi.org/10.3390/plants10020238
  34. 34. Ransom CJ, Jolley VD, Blair TA, Sutton LE, Hopkins BG. Nitrogen release rates from slow- and controlled-release fertilizers influenced by placement and temperature. PLoS One. 2020;15(6):e0234544. https://doi.org/10.1371/journal.pone.0234544
  35. 35. Trolove S, Wijeyekoon S, Tan Y. Effect of temperature on the rate of nitrogen release from a controlled release fertilizer. In: Currie LD, Christensen CL, editors. Nutrient loss mitigations for compliance in agriculture. Occasional Report; 2019.
  36. 36. Qiao D, Li J, Zhang S, Yang X. Controlled release fertilizer with temperature-responsive behavior coated using polyether polyol/polycaprolactone blend-based polyurethane performs smart nutrient release. Mater Today Chem. 2022;26:101249. https://doi.org/10.1016/j.mtchem.2022.101249
  37. 37. Andrade AB, Guelfi DR, Chagas WF, Cancellier EL, de Souza TL, Oliveira LS, et al. Fertilizing maize croppings with blends of slow/controlled release and conventional nitrogen fertilizers. J Plant Nutr Soil Sci. 2021;184(2):227–37. https://doi.org/10.1002/jpln.201900609
  38. 38. Jin S, Wang Y, He J, Yang Y, Yu X, Yue G et al. Preparation and properties of a degradable interpenetrating polymer networks based on starch with water retention, amelioration of soil and slow release of nitrogen and phosphorus fertilizer. J Appl Polym Sci. 2013;128(1):407–15. https://doi.org/10.1002/app.38162
  39. 39. Kong W, Li Q, Li X, Su Y, Yue Q, Gao B. A biodegradable biomass-based polymeric composite for slow release and water retention. J Environ Manage. 2019;230:190–98. https://doi.org/10.1016/j.jenvman.2018.09.086
  40. 40. Zhao C, Zhang L, Zhang Q, Wang J, Wang S, Zhang M, et al. The effects of bio-based superabsorbent polymers on the water/nutrient retention characteristics and agricultural productivity of a saline soil from the Yellow River Basin, China. Agric Water Manag. 2022;261:107388. https://doi.org/10.1016/j.agwat.2021.107388
  41. 41. Bauli CR, Lima GF, de Souza AG, Ferreira RR, Rosa DS. Eco-friendly carboxymethyl cellulose hydrogels filled with nanocellulose or nanoclays for agriculture applications as soil conditioning and nutrient carrier and their impact on cucumber growing. Colloids Surf A Physicochem Eng Asp. 2021;623:126771. https://doi.org/10.1016/j.colsurfa.2021.126771
  42. 42. Chen X, Guo T, Yang H, Zhang L, Xue Y, Wang R, et al. Environmentally friendly preparation of lignin/paraffin/epoxy resin composite-coated urea and evaluation for nitrogen efficiency in lettuce. Int J Biol Macromol. 2022;221:1130–41. https://doi.org/10.1016/j.ijbiomac.2022.09.112
  43. 43. Mazloom N, Khorassani R, Zohuri GH, Emami H, Whalen J. Development and characterization of lignin-based hydrogel for use in agricultural soils: preliminary evidence. Clean Soil Air Water. 2019;47(11):1900101. https://doi.org/10.1002/clen.201900101
  44. 44. Zhang W, Wang G, Zhang B, Sui W, Si C, Zhou L, et al. Green potassium fertilizer from enzymatic hydrolysis lignin: effects of lignin fractionation on wheat seed germination and seedling growth. Int J Biol Macromol. 2024;262:130017. https://doi.org/10.1016/j.ijbiomac.2024.130017

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