Chlorose-Ursachen bei Reben (Vitis vinifera L.) am natürlichen Standort |
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| Authors: | A Booß H Kolesch W Hfner |
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| Institution: | A. Booß,H. Kolesch,W. Höfner |
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| Abstract: | Reasons for chlorosis of vine (Vitis vinifera L.) under field conditions - 1 Analysis of leaf and soil samples from green and chlorotic vineyards did not result in a clear correlation between chlorosis and one of the soil factors determined (pH, concentration of HCO3?, water soluble P, DTPA-extractable Fe, Mn, Zn, Cu).
- 2 In severe chlorotic leaves the concentration of all elements investigated was increased, while in weak chlorotic leaves the concentration of Fe, Mn, Zn, Cu and P stayed unchanged.
- 3 There was no change neither in the P: Fe nor in the K: Ca ratio of the leaves due to chlorosis, but significant differences existed in the ratio extractable Fe: total Fe and total P: extractable Fe between green and chlorotic leaves.
- 4 The increased amount of Mn and Zn in severe chlorotic leaves reached a 100 %, the also increased amount of Fe only a 20% extractability by 0,5 n HCl, which together with the high P-concentration can be assumed as a main reason for chlorosis.
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