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Details for article 29 of 54 found articles
| Title: |
Estimation of Phosphorus Status of Soil Fe-Enriched Concretions with the Acid Ammonium Oxalate Method |
| Author: |
Gasparatos, Dionisios Haidouti, Constantina Haroulis, Athanasios Tsaousidou, Panagiota |
| Appeared in: |
Communications in soil science and plant analysis |
| Paging: | Volume 37 (2006) nr. 15-20 pages 2375-2387 |
| Year: |
2006-06-01 |
| Contents: |
Iron (Fe)-enriched concretions, a complex natural matrix with high chemical heterogeneity and phosphate-sorption capacity, is widespread in soils with restrictive drainage in Greece. However, the phosphorus (P) status and related characteristics of Fe-enriched concretions in agricultural soils in areas where P fertilization is mainly inorganic are relatively unknown. Active noncrystalline Fe and aluminum (Al) oxides (Feox, Alox), oxalate extractable P (Pox), P sorption capacity (PSC), and the degree of P saturation (DPS) of Fe-enriched concretions from agricultural imperfectly drained soils in central Greece were determined using the acid ammonium oxalate method. The concretions contain 13 times as much Feox, twice as much Alox, and almost 15 times as much Pox than the surrounding soil matrix. Pox accounted for 50-80% of total P of the soil concretions, indicating strong accumulation of noncrystalline P components (Al- and Fe-P). The PSC, expressed as a 0.5 (Alox+Feox), ranged from 184.7 to 314 mmol kg-1, demonstrating the strong affinity of the Fe-enriched concretions for P. The DPS, which represents the fraction of concretion sorbent surface coverage by P, was computed as 100 (Pox/PSC) with values ranging from 6 to 13% (mean=8%). The results of this study indicate that the Fe-enriched concretions, due to their high noncrystalline Fe and Al oxides content, act as major sink of phosphate, controlling the location, mobility, and dynamics of P in agricultural soils with restrictive drainage. |
| Publisher: |
Taylor & Francis |
| Source file: |
Elektronische Wetenschappelijke Tijdschriften |
Details for article 29 of 54 found articles
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