| authors: | Chen, G. ; He, Z. ; Stoffella, P. ; Yang, X. ; Yu, S. ; Calvert, D. |
| title: | Use of dolomite phosphate rock (DPR) fertilizers to reduce phosphorus leaching from sandy soil |
| year: | 2006 |
| source: | J. Environmental Pollution 139:176-182 |
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| abstract: | There is increasing concern over P leaching from sandy soils applied with water-soluble P fertilizers. Laboratory column leaching experiments were conducted to evaluate P leaching from a typical acidic sandy soil in Florida amended with DPR fertilizers developed from dolomite phosphate rock (DPR) and N-Viro soil. Ten leaching events were carried out at an interval of 7 days, with a total leaching volume of 1183 mm equivalent to the mean annual rainfall of this region during the period of 2001-2003. Leachates were collected and analyzed for total P and inorganic P. Phosphorus in the leachate was dominantly reactive, accounting for 67.7 - 99.9% of total P leached. Phosphorus leaching loss mainly occurred in the first three leaching events, accounting for 62.0-98.8% of the total P leached over the whole period. The percentage of P leached (in the total P added) from the soil amended with water soluble P fertilizer was higher than those receiving the DPR fertilizers. The former was up to 96.6%, whereas the latter ranged from 0.3% to 3.8%. These results indicate that the use of N-Viro based DPR fertilizers can reduce P leaching from sandy soils. |
| keywords: | Phosphorus leaching; DPR fertilizers; Water-soluble P fertilizer; Sandy soils |
