Effect of soil salinity on the electro-chemical and chemical kinetics of some plant nutrients in submerged soils |
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| Authors: | F N Mahrous D S Mikkelsen A A Hafez |
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| Institution: | (1) Department of Agronomy and Range Science, University of California, Davis, USA;(2) Present address: Soil and Water Research Institute, Sakha Agricultural Research Station-Kafr El-Sheikh, Egypt |
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| Abstract: | Summary The electro-chemical and chemical kinetics of six California rice soils were significantly influenced by the presence of salts
up to an EC of 9 mmhos/cm in saturation extract (ECe). Subsamples of each soil salinity treatment were incubated for periods up to 10 weeks after flooding. Most of the changes
in Eh and pH values took place in the first 3–4 weeks after submergence. Salinity decreased pH values, but slightly increased
the redox-potential. Both ammonification and nitrate reduction were significantly decreased, by increasing soil salinity.
Salinity up to 9 mmhos/cm did not affect levels of Bray and Kurtz extractable P, but increased the water extractable Ca, Mg,
K and Mn. In DTPA extract, salinity in incubated soils had no effect on Zn in 4 soils, but it decreased Fe in acid and neutral
soils. Possible explanations for the electro-chemical and chemical kinetic changes due to flooding and salinity are discussed. |
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| Keywords: | Ammonification Eh Flooded soils Iron Manganese Nitrate reduction Phosphorus pH Salinity and extractable cations Zinc |
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