Fate of calcium in the sugar?beet plant

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Abstract
Calcium accumulates mainly in the aerial parts of the sugar‐beet plant. With oxalate, calcium and other cations precipitate in shoot cells as oxalate crystals. The oxalate results from a carboxylation reaction, in which the excess OH‐generated in shoot cells by the nitrate‐assimilation process, is neutralized. The occurrence of tip‐burn under field conditions during periods of rapid vegetative growth and high nitrogen fertilization is explained by an overproduction of oxalate in expanded young leaves. The disappearance of calcium‐deficiency symptoms later in the season might be the result of calcium redistribution from the roots in July and August.