POTENTIAL OF AGRONOMIC TREATMENTS TO EFFE CT YIELD AND QUALITY OF SUGAR-BEETS .2. CALCULATED PARAMETERS OF YIELD AND QUALITY

After publication of the ''Neue Braunschweiger Formel'' for reevaluati on of internal quality of the sugar beet, the effect of ''treatments'' year, location, variety, nitrogen fertilizing, population density, ti me of sowing, time of harvesting and their interactions on old and new parameters of quality and yield (sugar loss, sugar extractability, wh ite sugar concentration and white sugar yield) were evaluated by means of estimation of variance components. New parameters of quality and y ield were derived by using the new formula of sugar loss. The main inf luences on the analyzed parameters were exerted by ''treatments'' year and year x location. By adopting the new formula, the effect of treat ments location and nitrogen fertilizing increased, the effect of treat ment Variety decreased concerning sugar extractability and sugar loss. Response functions of sugar loss and sugar extractability on nitrogen fertilizing, population density, time of sowing and time of harvestin g are shown, furthermore new ranking of varieties in terms of newly de fined internal quality. Although sugar loss is strongly affected by ni trogen fertilizing, almost no effect on white sugar content and white sugar yield could be noticed. White sugar yield was effected to over 5 0% of all components of variance by ''treatments'' year and year x loc ation, controlable treatments variety and nitrogen fertilizing had alm ost no effect. High white sugar yields are achieved by skilful ''use'' of treatments time of sowing and population density.