Abstract
Models and experimental studies of the rhizosphere of rice plants growing in anaerobic soil show that two major processes lead to considerable acidification (1-2 pH units) of the rhizosphere over a wide range of root and soil conditions. One is generation of H+ in the oxidation of ferrous iron by O2 released from the roots. The other is release of H+ from roots to balance excess intake of cations over anions, N being taken up chiefly as NH4 +. CO2 exchange between the roots and soil has a much smaller effect. The zone of root-influence extends a few mm from the root surface. There are substantial differences along the root length and with time. The acidification and oxidation cause increased sorption of NH4 + ions on soil solids, thereby impeding the movement of N to absorbing root surfaces. But they also cause solubilization and enhanced uptake of soil phosphate.
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© 1993 Springer Science+Business Media Dordrecht
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Kirk, G.J.D., Begg, C.B.M., Solivas, J.L. (1993). The chemistry of the lowland rice rhizosphere. In: Barrow, N.J. (eds) Plant Nutrition — from Genetic Engineering to Field Practice. Developments in Plant and Soil Sciences, vol 54. Springer, Dordrecht. https://doi.org/10.1007/978-94-011-1880-4_10
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DOI: https://doi.org/10.1007/978-94-011-1880-4_10
Publisher Name: Springer, Dordrecht
Print ISBN: 978-94-010-4832-3
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