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Competitive sorption and desorption of phosphate and citrate in clayey and sandy loam soils
| Content Provider | Scilit |
|---|---|
| Author | Souza, Matheus Fonseca De Soares, Emanuelle Mercês Barros Silva, Ivo Ribeiro Da Novais, Roberto Ferreira Silva, Mailson Félix De Oliveira |
| Copyright Year | 2014 |
| Abstract | The increase of organic acids in soils can reduce phosphorus sorption. The objective of the study was to evaluate the competitive sorption of P and citrate in clayey and sandy loam soils, using a stirred-flow system. Three experiments were performed with soil samples (0-20 cm layer) of clayey (RYL-cl) and sandy loam (RYL-sl) Red Yellow Latosols (Oxisols). In the first study, the treatments were arranged in a 2 × 5 factorial design, with two soil types and five combinations of phosphorus and citrate application (only P; P + citrate; and citrate applied 7, 22, 52 min before P); in the second, the treatments were arranged in a 2 × 2 factorial design, corresponding to two soils and two forms of P and citrate application (only citrate and citrate + P); and in the third study, the treatments in a 2 × 2 × 6 factorial design consisted of two soils, two extractors (citrate and water) and six incubation times. In the RYL-cl and RYL-sl, P sorption was highest (44 and 25 % of P application, respectively), in the absence of citrate application. Under citrate application, P sorption was reduced in all treatments. The combined application of citrate and P reduced P sorption to 25.8 % of the initially applied P in RYL-cl and to 16.7 % in RYL-sl, in comparison to P without citrate. Citrate sorption in RYL-cl and RYL-sl was highest in the absence of P application, corresponding to 32.0 and 30.2 % of the citrate applied, respectively. With P application, citrate sorption was reduced to 26.4 and 19.7 % of the initially applied citrate in RYL-cl and RYL-sl, respectively. Phosphorus desorption was greater when citrate was used. Phosphorus desorption with citrate and water was higher in the beginning (until 24 h of incubation of P) in RYL-cl and RYL-sl, indicating a rapid initial phase, followed by a slow release phase. This suggests that according to the contact time of P with the soil colloids, the previously adsorbed P can be released to the soil solution in the presence of competing ligands such as citrate. In conclusion, a soil management with continuous input of organic acids is desirable, in view of their potential to compete for P sorption sites, especially in rather weathered soils. |
| Related Links | http://www.scielo.br/pdf/rbcs/v38n4/11.pdf http://www.scielo.br/scielo.php?script=sci_pdf&pid=S0100-06832014000400011&lng=en&nrm=iso&tlng=en |
| Ending Page | 1161 |
| Page Count | 9 |
| Starting Page | 1153 |
| e-ISSN | 01000683 |
| DOI | 10.1590/s0100-06832014000400011 |
| Journal | Revista Brasileira de Ciência Do Solo |
| Issue Number | 4 |
| Volume Number | 38 |
| Language | English |
| Publisher | FapUNIFESP (SciELO) |
| Publisher Date | 2014-08-01 |
| Access Restriction | Open |
| Subject Keyword | Revista Brasileira de Ciência Do Solo Soil Science Incubation Time |
| Content Type | Text |
| Resource Type | Article |
