| Popis: |
The sugarbeet is an herbaceous dicotyledon. The annual world production of sugarbeet exceeds 200 million tons. It supplies 40% of the world's sugar. The sugarbeet, a biennial, normally completes its vegetative cycle in 2 years. During the first year it develops a large succulent root, in which reserve food sugar is stored. During the second year it produces flowers and seeds. Favorable environmental conditions and proper agronomic practices (such as temperatures, climate, day length, fertilization, disease control, control of late growth) are essential for producing high sugar and less impure sugarbeet. Proper nitrogen fertilization increases the yield, but decreases the sugar percentage and juice purity of sugarbeet. Nitrate is the principle source of nitrogen used by sugarbeets. Nitrate uptake and metabolism require energy which is derived at the expense of sugar accumulation. Glutamine in sugarbeet is synthesized mainly in the roots and is transported to the leaves. Estimation and application of the op... |
