Two field experiments were conducted out in a lysimeter at Sakha Agricultural Research Station, Kafr Elsheikh Governorate, Agricultural Research Center, Egypt, during 2018 - 2019 and 2019 - 2020 winter seasons to investigate the influence of four potassium fulvate treatments (without potassium fulvate, soil application, foliar application and soil+ foliar application) and foliar application with boron in three levels (without, 20 and 40 mg B/liter) and their interactions on growth, yield, its components and quality of sugar beet (triple cross Farida hybrid as multigerm variety). A strip-plot design with three replicates was used. The obtained results showed that soil application of potassium fulvate (4  Liters fed-1) besides spraying twice with potassium fulvate (5 cm³/liter water) gave the highest effective values of yield components, chemical constituents, quality and yields. Foliar application of boron (40 mgL^-1) was more effective than other treatments (without, 20 mg B/liter). It could be concluded that the interaction between foliar applications with boron (40 mgL^-1) after 50 and 70 days from sowing in the presence addition of soil application with potassium fulvate (4  Liters fed-1) besides spraying twice with potassium fulvate (5 cm³/liter water) achieved the highest growth, yield and its components of the sugar beet under the conditions at Kafr Elsheikh Governorate, Egypt.