Beziehung zwischen der Eisenversorgung von Weinreben und dem pH-Verlauf in der Nährlösung
DOI:
https://doi.org/10.5073/vitis.1978.17.152-160Abstract
Relation between iron supply to grapevine and pH pattern in the nutrient solution
In water culture experiments the effects of iron deficiency (-Fe) and iron supply as FeEDTA (control) or Fe(OH)3 on the pH pattern in the nutrient solution in the harvest composition, the wine pH and the level of free SO2 are also signifiner" have been studied.
With sufficient iron (FeEDTA), the pH of the nutrient solution increased from 6 to approximately 7 during the experiment. However, the pH decreased under iron stress (-Fe or Fe(OH)3) to as low as 4. Simultaneously with this decrease in pH, chlorosis occured on the young leaves; with Fe(OH)3-supply, however, the pH rose again after some days, accompanied by regreening of the leaves. At harvest, the young leaves of the Fe(OH)3 treatment contained more iron and the chlorophyll content was at least as high as in the control (FeEDTA). Nevcrtheless, with Fe(OH)3 the shoot growth was clepressed as much as in plants without iron supply (-Fe).
The results indicate that like other dicotyledonous plant species, grapevine is also able to lower the pH of the growth medium under iron stress and utilize inorganic Fe-III compounds even in well aeiated systems. This regulation mechanism is probably of considerable im~)ortance for the iron uptake from soils low in iron availability.
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