A  field experiment was conducted  at El-Gemmeiza Agric. Res. Station, Gharbeya Governorate, Egypt during the two successive winter  seasons of 2017/2018 and 2018/2019,  to study the effect of sulphur ( 0, 40 and 80 kg/fad.) and three foliar spray treatments (mixture of FeSO­₄ 20%+MnSO₄3H₂O 23%+ZnSO₄7H₂O 23% +B as boric acid 17%) at 1%, blue green algae extract at 1 liter /fad. and  yeast extract at 100 ml/liter water  on growth ,  yield and  root quality of  sugar beet (cv Oskar poly) grown in a clay soil   conditions. These treatments were arranged in a split plot in a complete block design with three replications.  Sulphuer levels were randomly distributed in the main plots , while   foliar  spray  treatments were randomly arranged in the sub plots. The interaction between sulphur at 80 kg/fad. and spraying with blue green algae extract at 1 liter / fad. gave the highest values of sugar beet shoots, roots and its components. While , the interaction between sulphur at 80 kg/fad. and spraying with  the mixture of Fe+Zn+Mn+B  at 1 %  recorded  maximum  values  of Fe, Zn, Mn and B in leaf tissues and roots. The increases in yield of sugar were about 32.8 and 56.3 % for the interaction between 80 kg S/fad. and spraying  with blue green algae, 24.9 and 42.7 % for the interaction between 80 kg S/fad. and spraying  with mixture of Fe+Zn+Mn+B  over  the  interaction between 0 S and spraying with yeast extract in the 1^st and 2^nd seasons, respectively.