Abstract
Dicotyledonous plants subjected to Fe-deficiency stress can decrease pH in the rhizosphere by proton excretion and reduce ferric iron by an activated reduction system in the plasma membranes of the root or by reductants released from the roots. The efficiency by which these plants take up Fe may strongly depend on their cation-anion balance. This study presents results of two experiments conducted to evaluate the effect of K, growth stage and cultivar on ionic balance and Fe acquisition of peanut (Arachis hypogaea L.) plants.
Potassium applications to the high calcareous soil (30.3% CaCO3) favoured proton release, but did not ameliorate plant Fe acquisition. At the earliest stages of plant growth, anion uptake exceeded cation uptake due to intensive N uptake. With time, a shift in the ionic balance was observed as a result of predominant cation uptake. It appears that the relationship between H/OH-ion release and Fe nutrition of peanut plants is actually a complex phenomenon under soil conditions and depends on some soil parameters, such as CaCO3 content. Even by enhanced H-ion release Fe nutrition of plants can be impaired if soil CaCO3 is too high.
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© 1991 Springer Science+Business Media Dordrecht
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Zaharieva, T., Römheld, V. (1991). Factors affecting cation-anion uptake balance and iron acquisition in peanut plants grown on calcareous soils. In: Chen, Y., Hadar, Y. (eds) Iron Nutrition and Interactions in Plants. Developments in Plant and Soil Sciences, vol 43. Springer, Dordrecht. https://doi.org/10.1007/978-94-011-3294-7_12
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DOI: https://doi.org/10.1007/978-94-011-3294-7_12
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