The present study reveals that the allelopathic potential of two most common weeds viz. Alternanthera sessilis, [L.] R.Br., and Cynodon dactylon, [L.] Pers. in jowar fields of our area. The aqueous leaf extracts (25, 50, 75 & 100% Conc.) of above said weeds are examined for seed germination, root-shoot length, biomass and protein content of jowar. The drastic change occurs in seed germination. After 72 hours of germination, 75% concentration of both weed extracts causes 100% germination. 75 and 100% concentrations of A. sessilis, [L.] R.Br., extracts shows maximum root-shoot length and same trend occurs in 25 and 75% concentration of C. dactylon, [L.] Pers. in root and shoot length respectively. The change in biomass is not noticeable. The protein content is highly affected by treatment of weed extracts and stimulated more than two and three times than control by A. sessilis, [L.] R.Br., and C. dactylon, [L.] Pers. respectively.