Effect of fertilization with fermented bioslurry on sugar beet bulbs quality and yield

In three-year field experiment application of fermented bioslurry after biogass production as an organic fertilizer positively influenced the yield of sugar beet roots. Both the autumnal and the spring applications of fermented bioslurry increased the root yield in comparison with unfertilized control treatment. When comparing with farm-yard manure application treatment, spring application of bioslurry resulted in statistically significant increase of root yield, but with autumnal application there were no significant differences. In general, the highest yield increase was found out with spring bioslurry application. On the other side, the highest sugar content was determined at autumnal application, with the highest potassium content and lowest sodium content in roots on the average of three years. In spite of lower sugar content and raffinate extraction, spring application of fermented bioslurry provided the highest raffinate production of all treatments, particularly due to the highest root yield and lowest potassium and a-aminonitrogen content in roots of this treatment on the average of three experimental years. Use of bioslurry increased both quantity (root yield) and quality (raffinate production) of sugar beet by both the autumnual spring application. The achieved results were advanced in comparison with control treatment and in the case of spring application also in comparison with farm-yard application treatment. On the basis of achieved three-year results, this material can be recommended for sugar beet fertilization, especially in spring term.