The root yield, quality and sugar yield were studied in a long-term stationary trial at Rimski Šančevi (Novi Sad, Serbia) experimental station. Sugar beet was grow in a four course rotation (sugar beet, maize, sunflower and wheat). In this trial increasing amounts of NPK nutrients were investigated. The trial included 20 fertilizing variants with 50, 100 and 150 kgha -1 active matter of each element (N, P 2 O 5 and K 2 O). At control variant (unfertilized) in a four-year average was obtained the root yield of 44,3 tha -1 . With increasing amount of nitrogen to 50 kgha -1 , the root yield was increased at 62,9 tha -1 while digestion was decreased for 0,26%. As a result, sugar yield was increased for 2,15 tha -1 . With increasing nitrogen amount to 100 and 150 kgha -1 root yield was higher for 5,09 and 5,92 tha -1 , respectively. At the same time produced digestion was lower for 0,64% and 1,62%, while refined sugar yield was the same and lower for 0,51 tha -1 , respectively. By increasing amounts of phosphorus from 50 to 100 and 150 kgha -1 root yield was increased for 0,1 and 4,85 tha -1 , and sugar yield for 0 and 100 kgha -1 , respectively. Increased doses of potassium were produced that root yield was higher for 0,98 and 2,77 tha -1 , while the  sugar yield for 200 and 120 kgha -1 , respectively.

sugar beet; root yield; digestion; nitrogen; phosphorus; potassium

Presentation: oral