Silicon effects on soil phosphorus availability: results obtained depend on the method used

被引:0
|
作者
Uhuegbue, Peter Onyisi [1 ]
Stein, Mathias [1 ]
Kalbitz, Karsten [2 ]
Schaller, Joerg [1 ]
机构
[1] Leibniz Ctr Agr Landscape Res ZALF, Muncheberg, Germany
[2] TUD Dresden Univ Technol, Inst Soil Sci & Site Ecol, Soil Resources & Land Use, Tharandt, Germany
关键词
soil phosphorus; water extraction; CAL extraction; Mehlich-III extraction; amorphous silica; phosphorus availability; EXTRACTANTS; ADSORPTION; ACID; SI;
D O I
10.3389/fenvs.2024.1461477
中图分类号
X [环境科学、安全科学];
学科分类号
08 ; 0830 ;
摘要
Phosphorus limitation occurs in many soils as a significant amount of soil P is retained in forms inaccessible to plants, such as bound to iron (Fe) minerals. Prior studies have shown that silicon (Si) can mobilize P from the binding sites of such minerals. Several P extraction methods have been developed to account for different P pools. Nevertheless, each of those methods uses different extractants and mechanisms to extract different P pools in soils. However, there is no study comparing different P extraction methods in the presence of Si fertilization. We tested the effect of Si on P mobility and determined the efficiency of water, Calcium acetate lactate (CAL), Mehlich-III, and Bray and Kurtz extraction methods for extracting P in the presence of amorphous silica (ASi) fertilization using two soils of contrasting characteristics. Significantly higher amounts of P were found at 3% ASi treatments (10 and 21 mg P kg-1) compared to the control (4 and 10 mg P kg-1) in the water extract in the high and low-yield soil, respectively just after 6 hours of extraction and increased with time. This may be explained by Si directly competing with P for sorption to Fe minerals. Using CAL extraction, Si addition showed no effect on P extractability. In contrast, the Mehlich-III and Bray extraction methods showed decreasing P extractability, especially at 3% ASi treatment (95 and 60 mg P kg-1) compared to the control (115 and 80 mg P kg-1) for the high-yield soil. The decreasing P contents in the presence of Si found in the Mehlich-III and Bray extracts may be attributed to the decrease in extraction effectiveness of the extractants to extract P while extracting Si and Fe. Our results showed that the Mehlich-III and Bray extraction methods may not be suitable for the determination of P availability in the presence of ASi fertilization since both extractants also extract Si and this may limit the completeness of P extraction. Therefore, in the presence of Si fertilizer, the water extraction method may be suitable to determine P availability and mobilization due to ASi.
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页数:11
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