| dc.creator | Drouillon,M. | |
| dc.creator | Merckx,R. | |
| dc.date | 2003-01-01 | |
| dc.date.accessioned | 2020-02-17T15:31:26Z | |
| dc.date.available | 2020-02-17T15:31:26Z | |
| dc.identifier | https://scielo.conicyt.cl/scielo.php?script=sci_arttext&pid=S0717-66432003000100009 | |
| dc.identifier.uri | https://revistaschilenas.uchile.cl/handle/2250/129627 | |
| dc.description | Exudation of low molecular weight carboxylates is an important phosphorus (P) acquisition strategy for plants in strongly P-fixing soils. The effect of citrate exudation on P availability was studied in five acid soils with a large organic matter content and a low available P pool. The amount of molybdate reactive P extracted by citric acid 10 mM (0.1-2 mg kg-1) was larger than the molybdate reactive P (MRP) extracted by CaCl2 10-3 M (0.007-0.07 mg kg-1). Both extractants were adjusted to soil pH prior to extraction. Also, the total P content of citric acid extracts (2-44 mg kg-1) far exceeded the total P content of CaCl2 (0.2-1.5 mg kg-1). However, ratios of MRP to total dissolved P (TDP) remained constant. When citric acid was added to the CaCl2-extracts (the pH of citric acid being adjusted to the pH of CaCl2, and thus eliminating release of P through acidification) a significant pH increase was noted. Simultaneously, MRP increased significantly in all but one soil. This suggests that the P availability enhancing properties of citric acid are not only due to acidification of the plant rhizosphere, but also to its Al and Fe complexing capacity | |
| dc.format | text/html | |
| dc.language | en | |
| dc.publisher | Facultad de Ciencias Naturales y Oceanográficas, Universidad de Concepción | |
| dc.relation | 10.4067/S0717-66432003000100009 | |
| dc.rights | info:eu-repo/semantics/openAccess | |
| dc.source | Gayana. Botánica v.60 n.1 2003 | |
| dc.subject | Andosols | |
| dc.subject | citric acid | |
| dc.subject | phosphorus availability | |
| dc.title | THE ROLE OF COTRIC ACID AS A PHOSPHORUS MOBILIZATION MECHANISM IN HIGHLY P-FIXING SOILS | |
