Abstract
The surface water of Sanjiang Plain generally contained 0.04 to 2.50 mg L-1 of dissolved Fe ion, while the groundwater contained 0.03 to 21.00 mg L-1, which is relative high in comparison with other regions. The purpose of this study was to investigate the effect of dissolved Fe in the irrigation water on the adsorption of ammonium. Soil samples were collected from topsoil of a paddy field. Fe2+concentration in either surface water (0.70 mg L-1) or groundwater (15.0 mg L-1) were simulated to employ batch experiments in lab. The results show that when Fe2+ concentration was 0.70 mg L-1, it might slightly increase ammonium adsorption on the albic black soil. However, when Fe2+ concentration increased to 15.0 mg L-1, it may increase or decrease ammonium adsorption on the albic albic black soil, depending on ammonium concentration in the soil solution. In details, ammonium adsorption capacity decreased when ammonium concentration is less than 30.77 mg L-1, while increased when it’s more than 30.77mg L-1. Long-term irrigated soils with groundwater might increase content of iron oxides in the paddy soils and thus increase ammonium adsorption capacity. However, Fe2+ in the irrigating water might also lead to desorption and leaching of ammonium in each flooding event.
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