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.