Abstract
Influence of soil nitrogen availability on quality components (sucrose, alpha-amino nitrogen, K+ and Na+) of sugarbeet was studied. This study was carried out on a homogeneous soil of southern Spain. We have tested 0, 100, 150, 200 and 250 kg N/ha. The use of increasing quantities of nitrogen fertilizer leads to a large decrease in sucrose concentration in the root, but also to a large increase in root production. This inverse relation does not exist at high levels of fertilization. Sugar yield per ha is most increased between 100 and 150 kg N/ha. On the other hand, the increase of nitrogen fertilization leads to a significant increase of alpha-amino nitrogen. High levels of nitrogen fertilization have a decisive negative effect on the juice purity calculated according to the Wieninger and Kubadinov equation, and therefore on the recovery of sucrose from the root tissue.
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