Effect of Biochar Mixed With Different Phosphorus Rates on Selected Soil Chemical Properties in Western Kenya

Published on 15 March 2026 | AgroEnvironmental Sustainability
Vol. 4 No. 1 (2026): March Issue | DOI: 10.59983/s2026040104
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AgroEnvironmental Sustainability
Collins Otieno Majengo , Jonathan Mutonyi , Caroline Agamala Kundu , Francis Namasake Muyekho

Abstract

Low maize productivity in Acrisols and Ferralsols caused by phosphorus (P) fixation poses a constraint to food security in Bungoma County, Kenya. Continuous application of ammonia-based fertilizers has further intensified soil acidification, leading to declining soil productivity. This study evaluated the effect of biochar combined with different P fertilizer rates on selected soil chemical properties and maize performance. Field experiments were conducted during the long and short rainy seasons of 2023 at Kibabii (Acrisols) and Chwele (Ferralsols). A split-plot design with three replicates was used, where biochar sources formed the main plots and P fertilizer rates constituted the subplots. Biochar was applied at 5 t ha-1 at planting, together with three P rates (0, 13, and 26 kg P ha-1). Nitrogen fertilizer was applied at 75 kg N ha-1 in split applications. Maize hybrid H513 (Kenya Seed Company) was planted at a spacing of 75 × 25 cm. Soil chemical properties including pH, total nitrogen, soil organic carbon (SOC), and available phosphorus were analyzed. Data were subjected to analysis of variance (ANOVA) using GenStat (14th edition, 2012), and treatment means were separated using the Least Significant Difference (LSD) test. The interaction between biochar and P rate was not significant (p ≤ 0.413), indicating no synergistic influence on maize yield. Correlation analysis between soil chemical properties and grain yield showed a positive relationship with available P (r = 0.5169) and negative relationships with soil pH (r = –0.3340) and SOC (r = –0.1132).

Keywords

acrisols ferralsols biochar phosphorus fixation soil enhancement

References

  1. Abujabhah, I. S., Doyle, R. B., Bound, S. A., & Bowman, J. P. (2017). Assessment of bacterial community composition, methanotrophic and nitrogen-cycling bacteria in three soils with different biochar application rates. Journal of Soils and Sediments, 18(1), 148–158. https://doi.org/10.1007/s11368-017-1733-1 [Google Scholar]
  2. Behera, B., Singdevsachan, S., Mishra, R., Dutta, S., & Thatoi, H. (2014). Diversity, mechanism and biotechnology of phosphate solubilising microorganism in mangrove—a review. Biocatalysis and Agricultural Biotechnology, 3(2), 97–110. https://doi.org/10.1016/j.bcab.2013.09.008 [Google Scholar]
  3. Geng, N., Kang, X., Yan, X., Yin, N., Wang, H., Pan, H., Yang, Q., Lou, Y., & Zhuge, Y. (2022). Biochar mitigation of soil acidification and carbon sequestration is influenced by materials and temperature. Ecotoxicology and Environmental Safety, 232, 113241. https://doi.org/10.1016/j.ecoenv.2022.113241 [Google Scholar]
  4. Guan, R., Li, Y., Jia, Y., Jiang, F., & Li, L. (2024). Acidified biochar one-off application for saline-alkali soil improvement: A three-year field trial evaluating the persistence of effects. Industrial Crops and Products, 222, 119972. https://doi.org/10.1016/j.indcrop.2024.119972 [Google Scholar]
  5. Hossain, M. Z., Bahar, M. M., Sarkar, B., Donne, S. W., Ok, Y. S., Palansooriya, K. N., Kirkham, M. B., Chowdhury, S., & Bolan, N. (2020). Biochar and its importance on nutrient dynamics in soil and plant. Biochar, 2(4), 379–420. https://doi.org/10.1007/s42773-020-00065-z [Google Scholar]
  6. IUSS (2014). Working Group WRB "World reference base for soil resources 2014: International soil classification system for naming soils and creating legends for soil maps." Food and Agriculture Organization (FAO), Rome, Italy. [Google Scholar]
  7. Jemal, K. and Yakob, A., (2021). Role of biochar on the amelioration of soil acidity. Agrotechnology, 10, 212. [Google Scholar]
  8. Khan, S., Irshad, S., Mehmood, K., Hasnain, Z., Nawaz, M., Rais, A., Gul, S., Wahid, M. A., Hashem, A., Abd_Allah, E. F., & Ibrar, D. (2024). Biochar Production and Characteristics, Its Impacts on Soil Health, Crop Production, and Yield Enhancement: A Review. Plants, 13(2), 166. https://doi.org/10.3390/plants13020166 [Google Scholar]
  9. KNBS. (2019a). Kenya Population and Housing Census, Nairobi, Kenya. [Google Scholar]
  10. KNBS. (2019b). Distribution of the population by Socio-Economic Characteristics, Nairobi, Kenya. [Google Scholar]
  11. Kibet, L., Sileshi, G., & Mafongoya, P. (2022). Soil organic carbon and crop productivity in African smallholder systems: a synthesis. Soil Use and Management, 38(2), 615–627. [Google Scholar]
  12. Kätterer, T., Roobroeck, D., Andrén, O., Kimutai, G., Karltun, E., Kirchmann, H., Nyberg, G., Vanlauwe, B., & Röing de Nowina, K. (2019). Biochar addition persistently increased soil fertility and yields in maize-soybean rotations over 10 years in sub-humid regions of Kenya. Field Crops Research, 235, 18–26. https://doi.org/10.1016/j.fcr.2019.02.015 [Google Scholar]
  13. Lehmann, J., Pereira da Silva, J., Steiner, C., Nehls, T., Zech, W., & Glaser, B. (2003). Nutrient availability and leaching in an archaeological Anthrosol and a Ferralsol of the Central Amazon basin: fertilizer, manure and charcoal amendments. Plant and Soil, 249(2), 343–357. https://doi.org/10.1023/a:1022833116184 [Google Scholar]
  14. Liu, X., Wang, H., Liu, C., Sun, B., Zheng, J., Bian, R., Drosos, M., Zhang, X., Li, L., & Pan, G. (2020). Biochar increases maize yield by promoting root growth in the rainfed region. Archives of Agronomy and Soil Science, 67(10), 1411–1424. https://doi.org/10.1080/03650340.2020.1796981 [Google Scholar]
  15. Nguyen Van, L., Herrmann, L., Le Dinh, T., Nguyen Van, C., Nguyen Van, L., Enez, A., Brau, L., & Lesueur, D. (2025). The short-term effect of coffee husk biochar application in acidic soils on soil properties, root mycorrhization, pest, and disease management and yields in Robusta coffee and black pepper plantations in Gia Lai province, Vietnam. Canadian Journal of Soil Science, 105, 1–15. https://doi.org/10.1139/cjss-2025-0027 [Google Scholar]
  16. MoALFC. (2021). Climate Risk Profile for Bungoma County. Kenya County Climate Risk Profile Series. The Ministry of Agriculture, Livestock, Fisheries and Co-operatives (MoALFC), Nairobi, Kenya. [Google Scholar]
  17. Mutuo, P. K., (2021). Phosphorus limitation and opportunities for maize intensification in sub-Saharan Africa. Nutrient Cycling in Agroecosystems, 120(2), 223–239. [Google Scholar]
  18. Nelson, D.W., & Sommers, L. E. (1996). Total carbon, organic carbon, and organic matter. p. 961-1010. In D.L Sparks et al. (eds.) Methods of soil analysis. Part 3.Chemical Methods.SSSA Book Series No. 5, SSSA and ASA, Madison, WI. [Google Scholar]
  19. Nepal, J., Ahmad, W., Munsif, F., Khan, A., & Zou, Z. (2023). Advances and prospects of biochar in improving soil fertility, biochemical quality, and environmental applications. Frontiers in Environmental Science, 11. https://doi.org/10.3389/fenvs.2023.1114752 [Google Scholar]
  20. Nogués, I., Mazzurco Miritana, V., Passatore, L., Zacchini, M., Peruzzi, E., Carloni, S., Pietrini, F., Marabottini, R., Chiti, T., Massaccesi, L., & Marinari, S. (2023). Biochar soil amendment as carbon farming practice in a Mediterranean environment. Geoderma Regional, 33, e00634. https://doi.org/10.1016/j.geodrs.2023.e00634 [Google Scholar]
  21. Okalebo, J. R., Gathua, K.W., & Woomer, P. L. (2002). Laboratory Methods of Soil and Plant Analysis: A Working Manual, 2nd edition., TSBF – CIAT, SSSEA, KARI, SACRED AFRICA, MOI UNIVERSITY, 128 pp. [Google Scholar]
  22. Omenyo, V. (2013). Effectiveness of liming materials and phosphorus fertilizer application on maize production in acid soils of Siaya and Kakamega counties. MSc. Thesis University of Eldoret, Kenya. [Google Scholar]
  23. Patel, M. R., & Panwar, N. L. (2023). Biochar from agricultural crop residues: Environmental, production, and life cycle assessment overview. Resources, Conservation & Recycling Advances, 19, 200173. https://doi.org/10.1016/j.rcradv.2023.200173 [Google Scholar]
  24. Prakongkep, N., Gilkes, R. J., Wisawapipat, W., Leksungnoen, P., Kerdchana, C., Inboonchuay, T., Delbos, E., Strachan, L., Ariyasakul, P., Ketdan, C., & Hammecker, C. (2020). Effects of Biochar on Properties of Tropical Sandy Soils Under Organic Agriculture. Journal of Agricultural Science, 13(1), 1. https://doi.org/10.5539/jas.v13n1p1 [Google Scholar]
  25. Premalatha, R. P., Poorna Bindu, J., Nivetha, E., Malarvizhi, P., Manorama, K., Parameswari, E., & Davamani, V. (2023). A review on biochar’s effect on soil properties and crop growth. Frontiers in Energy Research, 11. https://doi.org/10.3389/fenrg.2023.1092637 [Google Scholar]
  26. Santos, S. R. D., Lustosa Filho, J. F., Vergütz, L., & Melo, L. C. A. (2019). Biochar association with phosphate fertilizer and its influence on phosphorus use efficiency by maize. Ciência e Agrotecnologia, 43. https://doi.org/10.1590/1413-7054201943025718 [Google Scholar]
  27. Sarah, N. W. (2025). Effect of biochar and inorganic fertilizer combinations on the performance of maize on a humic nitisol at Kalro, Kakamega, Kenya. MSc. Thesis. Masinde Muliro University of Science and Technology, Kenya. [Google Scholar]
  28. Singh, B., Singh, B. P., & Cowie, A. L. (2010). Characterisation and evaluation of biochars for their application as a soil amendment. Soil Research, 48(7), 516–525. https://doi.org/10.1071/sr10058 [Google Scholar]
  29. Wang, H., Shao, D., Ji, B., Gu, W., & Yao, M. (2022). Biochar effects on soil properties, water movement and irrigation water use efficiency of cultivated land in Qinghai-Tibet Plateau. Science of The Total Environment, 829, 154520. https://doi.org/10.1016/j.scitotenv.2022.154520 [Google Scholar]
  30. Xu, S., Sheng, C., & Tian, C. (2020). Changing soil carbon: influencing factors, sequestration strategy and research direction. Carbon Balance and Management, 15(1). https://doi.org/10.1186/s13021-020-0137-5 [Google Scholar]
  31. Zhao, J. (2020). Soil pH effects on nutrient availability and crop productivity. Frontiers in Environmental Science, 8, 49. [Google Scholar]
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How to Cite

Majengo, C. O., Mutonyi, J., Kundu, C. A., & Muyekho, F. N. (2026). Effect of Biochar Mixed With Different Phosphorus Rates on Selected Soil Chemical Properties in Western Kenya. AgroEnvironmental Sustainability, 4(1), 26–34. https://doi.org/10.59983/s2026040104

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