Vol. 10, Special Issue 1, Part L (2026)

The present study elucidates the impact of SLASH-a matrix comprising sewage sludge, fly ash and lime on physic-chemical dynamics of soil of mustard crop (Brassica juncea L.). A randomized block design with thirteen treatments (0-60%) combined with the Recommended Dose of Fertilizer was employed to determine the threshold at which agronomic benefits are maximized. Comprehensive analysis of soil physical parameters and chemical attributes were conducted. Results demonstrated that moderate SLASH incorporation (20%-30%) significantly improved soil structural integrity, enhanced moisture retention capacity, and elevated nutrient bioavailability owing to increased organic carbon and ash derived mineral inputs Conversely, higher SLASH levels (>40%) adversely affected crop performance and soil fertility, likely owing to nutrient imbalance and potential accumulation of undesirable elements. The findings indicates that SLASH, when applied within optimal threshold, constitute a viable and sustainable soil amendment capable of improving soil health and mustard productivity, while emphasizing the necessity for regulated application to mitigate potential environmental risk.