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Non-metallic trace element (B), which is present in small quantities in all floors and plants occurs. The nutrient is for the growth of the vine very important of it for the transportation of sugar needed. Only small quantities are required, too large quantities also cause damage. Young vines in particular can die after over boron fertilization. Excess boron manifests itself through yellowish or reddish discoloration of the leaves from the leaf margin, as well as punctiform signs of death. If there is a slight deficiency, the leaves are marbled in light and dark green; when they are stronger, the younger leaves shine, change color from the edge, curl and die. The leaves are partly asymmetrical (crooked) and somewhat torn. In severe deficiency tendrils and die shoot tips off, side and miser drives then grow stronger and there is the so-called broom growth and chlorosis, With excess boron as well as with boron deficiency the germination and fruit set impaired and the bills Verrieseln, This in turn leads to chicken disease respectively. millerandage, Boron deficiency occurs particularly when it is dry. Therefore, preventive measures regarding water storage capacity are useful. A deficiency is also remedied with boron fertilization or leaf pollination.

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