Chlorosis index

Vine with leaves badly damaged by chlorosis

Chlorotic leaves - greenish stripes remain along the leaf veins .

The chlorosis index ( French indice de pouvoir chlorosant , IPC ) provides information about the ability of the soil to induce chlorosis in cultivated plants . The investigation method only gives usable results in very calcareous soils. The chlorosis index was specially developed for viticulture in France. The index value is an additional decision aid for the choice of the rootstock for vines on very calcareous soils.

calculation

To calculate the chlorosis index according to Juste and Pouget, the active lime content of the soil (activated lime) with the easily extractable (with ammonium oxalate ) iron is used:

Chlorosis Index (IPC) according to Juste and Pouget:

${\displaystyle {\text{IPC}}={\frac {{\text{Aktivkalk in}}\;\%\;\cdot \;10000}{({\text{Eisen in mg/kg}})^{2}}}}$

Lime content

The lime content in the soil is important for the occurrence of chlorosis . When specifying the soil lime content, a distinction is made between total lime and activated lime.

Activated lime

Is the proportion of lime that the vine can absorb (the proportion of lime particles below 0.002 mm) in the soil in percent.

Total lime

Is the lime (CaCO ₃ ) in the soil that can be extracted by hydrochloric acid in percent.

literature

• Karl Bauer, Ferdinand Regner , Barbara Schildberger: Viticulture . 9th edition, avBuch im Cadmos Verlag, Vienna 2013, ISBN 978-3-7040-2284-4 , p. 121.

Individual evidence

1. ↑ C. Juste, R. Pouget: Appréciation du pouvoir chlorosant des sols par un nouvel indice faisant intervenir le calcaire actif et le fer facilement extractible. Application au choix des porte-greffe de la vigne . In: CR Acad. Agric. de France. 58, 1972, pp. 352-354.