Rice By-Products Reduce Seed and Seedlings Survival of Echinochloa crus-galli, Leptochloa chinensis and Fymbristylis miliacea

Extracting allelochemicals from rice (Oryza sativa) straw and use for weed management is more sustainable than burning reduces herbicide dependence. Water soluble compounds were extracted shoots roots of OM 5930, generating both a crystallized by-product liquid extract. Crystallized product was applied to soil with pre-germinated barnyardgrass (Echinochloa crus-galli L. Beauv), red sprangletop (Leptochloa chinensis Nees), grass-like fimbry (Fimbristylis miliacea Vahl) seeds. As little as 9.4 g per pot (1 ton ha?1 biomass) reduced survival all species, the order sensitivity (BG) < (RS) grasslike-fimbry (GF). Increased rates or time exposure (3 42 days after treatment; DAT) resulted in stepwise reduction seed survival. Using extract, 5.33 pot?1 tons BG by 49.8%, while 2.67 RS GF 49.7 54.3%, respectively at DAT. A rate 8 seedlings 78.3% but lethal seedlings. The most abundant present ergosterol peroxide, p-coumaric acid, salicylic acid. 5930 promising variety extraction allelopathic application extended herbicidal activity.