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In the present work, agriculture waste based biocomposites were developed by reinforcing corn starch resin with various rice husk and walnut shell content of 5, 10 and 15 wt%. These fabricated biocomposites were investigated for physical, mechanical and thermal properties. It was found that the physical properties such as density and water absorption of the biocomposites remains in the range of 1.20–1.32 g cm− 3 and 4.32%–8.68% respectively, while these properties decreased by the increase of rice husk and walnut shell content. The slower degradation rate of rice husk and walnut shell resulted in enhanced degradation period of the biocomposites. Thermogravimetric analysis revealed that the addition of increased rice husk and walnut shell content enhanced the thermal stability of the biocomposites. The evaluated mechanical (tensile strength, flexural strength, compressive strength, impact energy and …