Regional investigation of soil phosphorus saturation degree, a study case in Switzerland

GlobalSoilMap ◽  
2014 ◽  
pp. 79-83 ◽  
Author(s):  
A Roger ◽  
S Sinaj ◽  
Z Libohova ◽  
E Frossard
Keyword(s):  
Soil Phosphorus ◽  
Saturation Degree ◽  
Study Case ◽  
Phosphorus Saturation

Soil phosphorus saturation degree: Review of some indices and their suitability for P management in Québec, Canada

1999 ◽  
Vol 79 (4) ◽  
pp. 615-625 ◽  
Author(s):  
Suzanne Beauchemin ◽  
R. R. Simard
Keyword(s):  
Environmental Fate ◽  
Saturation Index ◽  
Soil Phosphorus ◽  
Ammonium Oxalate ◽  
Calcareous Soils ◽  
Environmental Indicators ◽  
Saturation Degree ◽  
Soil P ◽  
Phosphorus Saturation ◽  
Soil Groups

Many agricultural fields contain excessive labile soil P in regard to crop needs. Its environmental fate must be assessed. The concept of P saturation degree is meaningful as it describes the portion of the soil binding sites already covered with P, and indicates the potential desorbability of soil P. The first objective of this study was to review different indices that have been proposed to estimate the degree of soil P saturation and the relationships between soil P saturation degree and P solubility. The second objective is to discuss their suitability as environmental indicators for P management in the province of Québec, Canada. In the Netherlands, the P saturation index is defined as the ratio of P to Al + Fe contents extracted by ammonium oxalate [Pox/( Alox + Feox ) or ( Pox/0.5( Alox + Feox )]. This approach has been mainly used with non-calcareous soils. In Québec, the ratio of Mehlich-III extractable P to Al (M3P/AlM3) is proposed as an alternative, which relies on routine laboratory test. However, the suitability of the M3P/AlM3 ratio has yet to be determined for some specific soil groups (e.g. gleyed soils, soils with Alox content >6 g kg−1) and for subsoil horizons. Regardless of the chosen index, it is suggested that the best way to manage the risk of water contamination by P in Québec (namely, defining critical levels of soil P saturation) may be to form homogeneous soil groups to account for their distinctive behaviour and characteristics. Key words: Phosphorus, saturation, management

Agri-environmental Thresholds using Mehlich III Soil Phosphorus Saturation Index for Vegetables in Histosols

2007 ◽  
Vol 36 (4) ◽  
pp. 975-982 ◽  
Author(s):  
Julie Guérin ◽  
Léon-Étienne Parent ◽  
Rahima Abdelhafid
Keyword(s):  
Saturation Index ◽  
Soil Phosphorus ◽  
Phosphorus Saturation

Environmental Mehlich-III soil phosphorus saturation indices for Quebec acid to near neutral mineral soils varying in texture and genesis

2006 ◽  
Vol 86 (4) ◽  
pp. 711-723 ◽  
Author(s):  
Annie Pellerin ◽  
Léon-Étienne Parent ◽  
Josée Fortin ◽  
Catherine Tremblay ◽  
Lotfi Khiari ◽  
...  
Keyword(s):  
Soil Texture ◽  
Preferential Flow ◽  
Soil Phosphorus ◽  
Testing Procedure ◽  
Soil Extraction ◽  
Environmental Indices ◽  
P Accumulation ◽  
Subsurface Layers ◽  
Phosphorus Saturation ◽  
Mineral Soils

The Mehlich-III method (M-III) (Mehlich 1984) is a multinutrient agri-environmental routine soil-testing procedure used in many jurisdictions in North America, but one that is affected by soil texture. The PW determined by the Sissingh (1971) method is an index of surface water contamination and desorbed P that is not influenced by soil texture and that can be used to define specific M-III critical environmental indices by soil texture group. Our objective was to define critical environmental indices by relating (P/Al)M-III to PW. We analyzed 275 soil samples from surface, and 175 from subsurface layers, varying in genesis, texture, and pH. The relationship between PW and (P/Al)M-III was influenced by soil properties, particularly soil texture and genesis. Fine-textured (> 300 g clay kg-1) and gleyed soils tended to release more PW at a given (P/Al)M-III compared with coarse-textured (≤ 300 g clay kg-1) and podzolized soils. Using a critical value of 9.7 mg PW L-1 derived from the literature, critical environmental (P/Al)M-III ratios were found to be 0.131 for coarse-, and 0.076 for fine-textured soils. Subsurface PW increased significantly with (P/Al)M-III above 0.131 in the plough layer of coarse-textured soils, but was independent of (P/Al)M-III in fine-textured soils, indicating contrasting mechanisms of P accumulation in subsurface layers (matrix vs. preferential flow). After accounting for soil texture, (P/Al)M-III appeared to be a useful index of P accumulation in Quebec mineral soils. Key words: Soil phosphorus saturation, Mehlich-III soil extraction method, water-extractable phosphorus, soil environmental phosphorus threshold, soil texture

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