Study aimed to investigate effects of poultry manure, biochar, and potassium polyacrylate, applied individually and in combination, on improving sandy soil properties and influencing selected physiological and chemical traits of rocket Eruca sativa L A field experiment was conducted using a randomized complete block design with three replications. Treatments consisted of two levels of Poultry manure 0 and 10 t ha⁻¹, three levels of potassium polyacrylate 0, 50, and 100 kg ha⁻¹, and three levels of biochar 0, 10, and 20 t ha⁻¹. Application of soil amendments significantly enhanced soil physical and chemical properties, including an increase in volumetric water content at field capacity from 8.00% to 13.93%, organic matter content from 1.18 to 1.46 g kg⁻¹, and the availability of essential nutrients (N, P, and K), without increasing soil salinity. The highest rates of each amendment demonstrated superior performance. Poultry manure at 10 t ha⁻¹ produced the highest chlorophyll content 52.04 SPAD, quercetin 132.6 ppm, erucin 181.7 mg g , and nitrate 547.5 mg 100 g⁻¹, while recording the lowest proline content 50.88 ppm. Similarly, potassium polyacrylate at 100 kg ha⁻¹ resulted in the highest values for chlorophyll 53.04 SPAD, quercetin 143.1 pp, erucin 190.2 mg g⁻¹, and nitrate 559.0 mg 100 g⁻¹, with a corresponding reduction in proline 50.05 ppm. Biochar at 20 t ha⁻¹ showed comparable improvements across all measured parameters. Interaction effects revealed that combined application of potassium polyacrylate 100 kg ha⁻¹ and biochar 20 t ha⁻¹ was the most effective binary treatment, significantly increasing quercetin 154.8 ppm and erucin 199.9 mg g⁻¹. Furthermore, combined use of all three amendments resulted in the highest chlorophyll content (54.40 SPAD) and maximized quercetin and erucin concentrations to 161.6 ppm and 206.8 mg g⁻¹, respectively.