The ionic balance of the sugar-beet plant was studied by measuring dry weight and chemical composition of every leaf, the crown and the root during the growing season.<p/>The sugar-beet plant has an almost neutral uptake. The nitrate and sulphate reduction determines the amount of carboxylates in the plant. Accumulation of carboxylates prevents large changes of cell-pH because of the ion-uptake and ion-utilization processes.<p/>In every plant part the carboxylates are a quantitative measure of the amount of nitrate reduced. It is concluded that nitrate is mainly reduced in the leaves and to a small extent in the root.<p/>It is proved that for the sugar-beet plant, Cl can be used as an index element to calculate the supply of the various ions to the various plant parts. Redistribution of potassium, calcium, magnesium, phosphate and organic N is determined by comparing the actual and calculated amounts in the various plant parts. The redistribution of potassium from the old leaves to the root is counterbalanced by redistribution of divalents in the opposite direction. The redistribution of the divalents takes place from organs with a relatively small oxalate production towards organs with a relatively large oxalate production.<p/>In an appendix a rapid carboxylate determination is described.
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