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The role of citric acid as a phosphorus mobilization mechanism in highly P-fixing soils

(2003) GAYANA. BOTANICA. 60(1). p.55-62
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Abstract
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.
Keywords
phosphorus availability, citric acid, Andosols

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Chicago
Drouillon, Margriet, and Roel Merckx. 2003. “The Role of Citric Acid as a Phosphorus Mobilization Mechanism in Highly P-fixing Soils.” Gayana. Botanica 60 (1): 55–62.
APA
Drouillon, M., & Merckx, R. (2003). The role of citric acid as a phosphorus mobilization mechanism in highly P-fixing soils. GAYANA. BOTANICA, 60(1), 55–62.
Vancouver
1.
Drouillon M, Merckx R. The role of citric acid as a phosphorus mobilization mechanism in highly P-fixing soils. GAYANA. BOTANICA. 2003;60(1):55–62.
MLA
Drouillon, Margriet, and Roel Merckx. “The Role of Citric Acid as a Phosphorus Mobilization Mechanism in Highly P-fixing Soils.” GAYANA. BOTANICA 60.1 (2003): 55–62. Print.
@article{1260503,
  abstract     = {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.},
  author       = {Drouillon, Margriet and Merckx, Roel},
  issn         = {0016-5301},
  journal      = {GAYANA. BOTANICA},
  keyword      = {phosphorus availability,citric acid,Andosols},
  language     = {eng},
  number       = {1},
  pages        = {55--62},
  title        = {The role of citric acid as a phosphorus mobilization mechanism in highly P-fixing soils},
  volume       = {60},
  year         = {2003},
}