ISHS Acta Horticulturae 477: IV International Symposium on Replant Problems
USE OF SULFURIC ACID TO PREVENT IRON CHLOROSIS IN GRAPEVINE GRAFTS ON CALCAREOUS SOIL. |
| Authors: | M.T. Nikolic, R.A. Dzamic, D.R. Stevanovic |
| Keywords: | Vitis vinifera, chlorophyll, ferrous iron, rhizosphere, bicarbonate, neutralization, proton excretion |
| Abstract:
In a pot experiment, grapevines were grown on calcareous, replant soil with a high pH and high concentration of bicarbonate. One-year-old vine grafts (cv. Riesling on Kober 5 BB rootstocks) were planted in pots with 5 kg air-dried soil. Technical sulfuric acid (diluted in a ratio of 1:4) was added in a quantity of 10 ml or 20 ml per pot. Treated plants did not show any symptoms of Fe deficiency. The application of sulfuric acid markedly increased the contents of chlorophyll a+b and so-called "physiologically active iron" (Fe2+) in grape leaves, as well as the content of iron in roots and shoots. Examination of chemical changes in the rhizosphere showed that the mechanism of sulfuric acid action possibly involves acidification in the rhizosphere and neutralization of HCO3 in the soil solution due to H+ release. | |
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