Phosphorus availability and sorption under alternating waterlogged and drying conditions

Phillips, I. R.

doi:10.1080/00103629809370175

Cited by 29 publications

(13 citation statements)

References 15 publications

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“…The patterns of change in pH, Eh, and acetate extractable Fe and P in the black clay soil under flooded-drying conditions were similar to those found in acidic wetland soils of Australia (Phillips, 1998a). When the soils dried, the values of acetate extractable Fe and P reported by Phillips (1998a) were much higher than those found in the present experiment. This could be related to the higher level of organic carbon in the Australian wetland soil (353 g/kg) compared with the Cambodian soil (15 g/kg).…”

Section: Intermittently Flooded Conditionssupporting

confidence: 80%

Amelioration of growth reduction of lowland rice caused by a temporary loss of soil-water saturation

2004

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Decreases in nutrient availability after loss of soil-water saturation are significant constraints to productivity in lowland rainfed rice soils. The effectiveness of soil amendments like lime and straw in ameliorating these constraints are poorly understood. This pot experiment was conducted in Cambodia to investigate changes in soil chemical properties and nutrient uptake by rice after applying lime or straw to continuously flooded or intermittently flooded soil. In continuously flooded soils, exchangeable Al decreased to below 0.2 cmolc/kg. Liming (pH 6.5-6.8) the continuously flooded soil decreased the levels of acetate extractable Fe and P, plant P uptake and shoot dry matter, but had no effect on either Bray-1 or Olsen extractable P values. By contrast, the addition of straw (3.5 g dry straw/kg soil) increased Bray-1, Olsen, and acetate extractable P, plant P uptake, shoot P, and shoot dry matter. The non-amended soils became strongly acidic after loss of soil water saturation: extractable Al increased to 1.0 cmol c /kg, a potentially harmful level for rice. By contrast, extractable P decreased markedly under loss of soil water saturation as did plant P uptake, shoot P, and shoot dry matter. With loss of soil water saturation, liming substantially depressed the levels of Al but it did not increase plant P uptake, shoot P, and shoot dry matter. Straw addition not only decreased extractable Al levels to well below 0.6 cmol c /kg under loss of soil water saturation, but it also increased extractability of soil P, plant P uptake, shoot P, and shoot dry matter. Thus, in rainfed environments, the incorporation of straw may be more effective than liming to pH 6.8 for minimising the negative effects of temporary loss of soil-water saturation on P availability, P uptake, and growth of rice.

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Section: Intermittently Flooded Conditionssupporting

confidence: 80%

Amelioration of growth reduction of lowland rice caused by a temporary loss of soil-water saturation

2004

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“…Eh and pH also indirectly affect P availability by affecting the solubility of metal ions as Mn, Al and Fe oxides and hydroxides or of CaCO 3 ; these bind to or adsorb phosphate ions and make them unavailable to plants (Brady and Weil 2010;Kemmou et al 2006;Phillips 1998;Sallade and Sims 1997;Vadas and Sims 1998).…”

Section: Phosphorusmentioning

confidence: 99%

Redox potential (Eh) and pH as drivers of soil/plant/microorganism systems: a transdisciplinary overview pointing to integrative opportunities for agronomy

2012

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Background Oxidation-reduction and acid-base reactions are essential for the maintenance of all living organisms. However, redox potential (Eh) has received little attention in agronomy, unlike pH, which is regarded as a master variable. Agronomists are probably depriving themselves of a key factor in crop and soil science which could be a useful integrative tool. Scope This paper reviews the existing literature on Eh in various disciplines connected to agronomy, whether associated or not with pH, and then integrates this knowledge within a composite framework. Conclusions This transdisciplinary review offers evidence that Eh and pH are respectively and jointly major drivers of soil/plant/microorganism systems. Information on the roles of Eh and pH in plant and microorganism physiology and in soil genesis converges to form an operational framework for further studies of soil/plant/microorganism functioning. This framework is based on the hypothesis that plants physiologically function within a specific internal Eh-pH range and that, along with microorganisms, they alter Eh and pH in the rhizosphere to ensure homeostasis at the cell level. This new perspective could help in bridging several disciplines related to agronomy, and across micro and macro-scales. It should help to improve cropping systems design and management, in conventional, organic, and conservation agriculture.

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“…Many of the dissolution and transport mechanisms in P‐enriched soils are not understood well enough to predict P loss quantitatively. Soil oxidation–reduction (redox) potential has been negatively correlated with P dissolution, where soils with lower redox potentials (more reduced conditions) may show enhanced P dissolution (Patrick and Khalid, 1974; Holford and Patrick, 1981; Willet, 1989; Vadas and Sims, 1998; Phillips, 1998). Therefore, there is a concern for increased risk of P loss from poorly drained (more reduced) soils that contain elevated levels of P.…”

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confidence: 99%

“…Dissolution of P under reducing conditions in flooded soils and sediments has been related to the reductive dissolution of Fe(III)‐oxides (Holford and Patrick, 1981; Jensen et al, 1998; Maguire et al, 2000; Phillips, 1998; Sallade and Sims, 1997b; Willet, 1989). Sallade and Sims (1997b) correlated oxalate‐extractable Fe with dissolved P after sediments were flooded under anoxic conditions for 21 d. Operationally defined chemical fractionation of solid phase inorganic P in sediments (Sallade and Sims, 1997b) and in soil (Maguire et al, 2000) suggested that P associated with Fe and Al were the predominant forms of P. In general, changes in Fe‐oxide mineral solubility or the relative distribution of PO 4 between Fe‐oxide (redox active) and Al‐oxide (non‐redox active) minerals could influence PO 4 dissolution during reduction.…”

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Dissolution of Phosphate in a Phosphorus‐Enriched Ultisol as Affected by Microbial Reduction

Hutchison

Hesterberg

2004

J of Env Quality

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Phosphorus dissolution often increases as soils become more reduced, but the mechanisms are not fully understood. The objectives of this research were to determine rates and mechanisms of P dissolution during microbial reduction of a surface soil from the North Carolina Coastal Plain. Duplicate suspensions of silt + clay fractions from a Cape Fear sandy clay loam (fine, mixed, semiactive, thermic Typic Umbraquult) were reduced in a continuously stirred redox reactor for 40 d. We studied the effects of three treatments on P dissolution: (i) 2 g dextrose kg(-1) solids added as a microbial carbon source at time 0 d; (ii) 2 g dextrose kg(-1) solids split into three additions at 0, 12, and 26 d; and (iii) no added dextrose. After 40 d of reduction, concentrations of dissolved reactive phosphorus (DRP) were similar for all treatments and increased up to sevenfold from 1.5 to 10 mg L(-1). The initial rate of reduction and dissolution of DRP was significantly greater for the 0-d treatment. A linear relationship (R(2) = 0.79) was found between DRP and dissolved organic carbon (DOC). Dissolved Fe and Al and pH increased, suggesting the formation of aqueous Fe- and Al-organic matter complexes. Separate batch experiments were performed to study the effects of increasing pH and citrate additions on PO(4) dissolution under aerobic conditions. Increasing additions of citrate increased concentrations of DRP, Fe, and Al, while increasing pH had no effect. Results indicated that increased dissolved organic matter (DOM) during soil reduction contributed to the increase in DRP, perhaps by competitive adsorption or formation of aqueous ternary DOM-Fe-PO(4) or DOM-Al-PO(4) complexes.

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Phosphorus availability and sorption under alternating waterlogged and drying conditions

Cited by 29 publications

References 15 publications

Amelioration of growth reduction of lowland rice caused by a temporary loss of soil-water saturation

Amelioration of growth reduction of lowland rice caused by a temporary loss of soil-water saturation

Redox potential (Eh) and pH as drivers of soil/plant/microorganism systems: a transdisciplinary overview pointing to integrative opportunities for agronomy

Dissolution of Phosphate in a Phosphorus‐Enriched Ultisol as Affected by Microbial Reduction

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