Transformation of Cotton Stalk Biochar into a Sustainable Slow-Release Potassium Fertilizer: Adsorption-Desorption Dynamics and Tomato Growth Impact | ||||
| Egyptian Journal of Soil Science | ||||
| Article 29, Volume 65, Issue 1, March 2025, Page 447-462 PDF (1.49 MB) | ||||
| Document Type: Original Article | ||||
| DOI: 10.21608/ejss.2025.336092.1920 | ||||
 View on SCiNiTO | ||||
| Authors | ||||
Shiksha Malik; Jitender Singh Laura 
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| Department of Environmental Science, Maharshi Dayanand University, Rohtak-124001, Haryana, India | ||||
| Abstract | ||||
| A slow-release potassium fertiliser (KBC) was prepared from biochar (BC) produced from cotton stalks. Zeta potential (negative charge), SEM (porous, smooth, oval shaped holes), EDX (potassium confirmed by a strong peak 3.31 keV), FTIR (C=C bonds in the Amine group in BC, in impregnated BC unsaturated compounds with C=O and C=C bonds, stretching of C-C bonds), and BET (SSA for BC: 2.566 m²/g & KBC: 2.145 m²/g) techniques were used for characterisation. Adsorption and desorption study of potassium using different models were assessed. Redlich isotherm model (R2= 0.99) outperformed other isotherm models. Tomato plants were utilised to evaluate the impact of BC-based potassium fertiliser on growth metrics. ANOVA was utilised to assess the statistical significance of these growth characteristics. The findings demonstrate that the BC-enhanced slow-release potassium fertiliser increases potassium availability and its use efficiency, and fosters prolonged plant development, providing a sustainable and effective solution for potassium as a slow release fertilizer in agriculture. | ||||
| Keywords | ||||
| Keywords: Adsorption isotherm; Biochar; Fertilizer; Pot study; Release kinetic; Slow-release | ||||
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