Two newly cultivars from sugar beet {Beta vulgaris,L; Chenopodiaceae Pleno(C1) and Plever(C2)} were used to study the effects of certain antioxidant application on elevating the harmful effects of drought stress condition on seed germination as well as seedling growth and its constituents Mannitol levels and/or Ascorbic;AsA , Salslic; SA, Humic; HA and seaweed; SWE were examined as biostimulants remediation substances (BRS). Analysis of variance showed a significant effects of  Mannitol level and/or the BRS used (P<0.001)on the rate of germination as well as fresh and dry weights of the seedling. The reduction in germination % and the increase in time required for seeds to germinate due to stress was observed in both sugar beet cv(s) studied. However, cv(2) was more susibtable than cv(1) in this respect. Germination was progressively inhibited by an increase in mannitol level in both cv(s). The strongest inhibition occurred at the third mannitol level (0.3 M) in cv(2).  However, cv(1) did not exert any significant effect on ultimate germination % under the 2^nd mannitol level. Increasing mannitol level was associated with a marked reduction in AsA, glutathione; GSH, catalase;CAT, guaiacol peroxidase;GPOD and superoxide dismutase;SOD as well as  total carbohydrates and total N concentrations, whereas, increased that of H₂O₂ and proline as well as T.S.S. and osmotic pressure  of the leaves and roots in both seedling cv(s)  . BRS decreased concentrations of H₂O₂ and proline whereas, increased that of AsA and GSH as well as CAT, GPOD and SOD in the development seedling of both cv (s).  Treatment with SWE showed an additive effects to that of stress treatments on increasing non-enzymatic and enzymatic antioxidants concentrations in both cv (s). Cv (1) showed, in general higher concentrations of AsA and GSH  as well as CAT, GPOD and SOD than that of cv (2) . The interactions treatments showed that any of the BRS used elevating the harmful effect drought stress caused by increasing mannitol level up to 3^rd one (3.0 M) . Again the SWE followed with HA treatments were the best in this respect