A soil phosphorus saturation index decreasing scooped weight effect in mehlich‐3 procedure

1999 ◽  
Vol 30 (15-16) ◽  
pp. 2157-2168 ◽  
Author(s):  
L. Khiari ◽  
A. Pellerin ◽  
J. Fortin ◽  
L. E. Parent
Keyword(s):  
Saturation Index ◽  
Soil Phosphorus ◽  
Weight Effect ◽  
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

Simple phosphorus saturation index to estimate risk of dissolved P in runoff from arable soils

2006 ◽  
Vol 16 (3) ◽  
pp. 206-210 ◽  
Author(s):  
S. Hughes ◽  
B. Reynolds ◽  
S.A. Bell ◽  
C. Gardner
Keyword(s):  
Saturation Index ◽  
Arable Soils ◽  
Phosphorus Saturation

An Agri‐Environmental Phosphorus Saturation Index for Acid Coarse‐Textured Soils

2000 ◽  
Vol 29 (5) ◽  
pp. 1561-1567 ◽  
Author(s):  
L. Khiari ◽  
L. E. Parent ◽  
A. Pellerin ◽  
A. R. A. Alimi ◽  
C. Tremblay ◽  
...  
Keyword(s):  
Saturation Index ◽  
Phosphorus Saturation

Agri-environmental models using Mehlich-III soil phospho rus saturation index for corn in Quebec

2006 ◽  
Vol 86 (5) ◽  
pp. 897-910 ◽  
Author(s):  
Annie Pellerin ◽  
Léon -Étienne Parent ◽  
Catherine Tremblay ◽  
Josée Fortin ◽  
Gilles Tremblay ◽  
...  
Keyword(s):  
Soil Fertility ◽  
Positive Response ◽  
Saturation Index ◽  
Soil Phosphorus ◽  
Low Fertility ◽  
Corn Yield ◽  
Soil Extraction ◽  
Soil P ◽  
Environmental Models ◽  
Requirement Models

Soil phosphorus (P), which is potentially a risk for environmental contamination, is currently interpreted using soil P saturation in North America. Our objective was to assess the ratio of P to aluminum (Al) in the Mehlich-III (M-III) soil test to build P requirement models for corn and soybean. We analyzed 129 corn and 19 soybean P fertilizer trials. For corn, the (P/Al)M-III ratio improved soil fertility classification compared with PM-III alone. The critical PM-III value as determined by the Cate-Nelson procedure was found to be 31.5 mg PM-III kg-1, close to published values. The critical (P/Al)M-III ratios of 0.025 for > 300 g clay kg-1 soils and 0.040 for ≤ 300 g clay kg-1 soils differed significantly between the two soil groups. For (P/Al)M-III ratios above 0.214, there was no positive response to added P for all soils regardless of texture. Using published critical environmental (P/Al)M-III ratios of 0.076 for > 300 g clay kg-1soils and 0.131 for ≤ 300 g clay kg-1 soils as benchmarks values, agri-environmental P requirement models were built using conditional expectations of 50 to 80% of computed optimum P values within a soil class. A validation study supported the low critical (P/Al)M-III ratios and the 50% conditional expectation model except for a high carbon soil which was outside the application range of the models. However, banded P decreased corn yield at four validation sites although the model predicted positive response to P. Soybean did not respond to P except at extremely low fertility levels ((P/Al)M-III ≤ 0.02) and behaved as a P-mining crop even in low-P soils. Corn-soybean rotations can reduce soil P to low (P/Al)M-III ratios with minimal agronomic risk. Key words: Soil phosphorus saturation, Mehlich-III soil extraction method, soil fertility classification, soil texture, fertilizer P requirement model, corn, soybean

scholarly journals Spatial Variability of Soil Phosphorus Indices under Two Contrasting Grassland Fields in Eastern Canada

Agronomy ◽  
2020 ◽  
Vol 11 (1) ◽  
pp. 24
Author(s):  
Jeff D. Nze Memiaghe ◽  
Athyna N. Cambouris ◽  
Noura Ziadi ◽  
Antoine Karam ◽  
Isabelle Perron
Keyword(s):  
Production Systems ◽  
Saturation Index ◽  
Soil Phosphorus ◽  
Sampling Strategy ◽  
Soil Sampling ◽  
Organic Fertilizers ◽  
Eastern Canada ◽  
Soil P ◽  
Permanent Pasture

Phosphorus (P) is an essential nutrient for grassland production systems. However, continuous applications of P fertilizers result in soil P accumulations, increasing the risk of P losses in runoff and erosion. This study aims to investigate the field-scale variability of soil-test P (STP) in two contrasting grassland fields using descriptive statistics and geostatistics for accurate recommendations on soil sampling strategy and sustainable approaches to P management. A young grassland (YG; 2 years) and an old grassland (OG; 10 years under permanent pasture) were classified as humo-ferric podzol and received organic fertilizers. Soil samples were collected in 16-m by 16-m triangular grids at two depths (0–5 and 5–20 cm). They were analyzed for available P and other soil elements extracted using the Mehlich-3 method (M3). The agri-environmental P saturation index (P/Al)M3 was calculated. Phosphorus accumulation was observed in OG (0–5 cm) as a result of long-term manure applications. Repeated applications of organic fertilizers can impact the long-term buildup of soil P, thus decreasing soil P va-riability and spatial dependence in permanent grasslands. A soil sampling strategy focusing on the 0–5 cm layer should be retained in permanent grasslands for sustainable P recommendations in Eastern Canada.

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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