Phosphorus and eutrophication
Phosphorus loss from soil
Soil phoshorus tests
Selecting an appropriate test
References

適切なリン試験と推奨法の選択に影響を与える土壌の性質

土壌	pH	鉱物	方法
酸性（acidic）	＜6.0	Al-P、Fe-P、Mn-P	Bray 1、Mehlich 1、Mehlich 3、水、IIP、AER
やや酸性〜ややアルカリ性（slightly acid to slightly alkaline）	6.0〜7.2	Al-P、Fe-P、Mn-P、Mg-P、Ca-P	Bray 1、Mehlich 1、Mehlich 3、Olsen、水、IIP、AER
アルカリ性（alkaline）、石灰質（calcareous）	＞7.2	Ca-P、Mg-P	Olsen、水、IIP、AER
Bray 1：塩酸（HCｌ）とフッ化アンモニウム（NH4F）←Bray and Kurtz（1945） Mehlich 1：塩酸（HCｌ）と硫酸（H2SO4）←Mehlich Mehlich 3：酸〔酢酸（HOAc）と硝酸（HNO3）〕と塩〔フッ化アンモニウム（NH4F）と硝酸アンモニウム（NH4NO3）〕とキレート剤〔エチレンジアミン四酢酸（EDTA、C10H16N2O8、(HOOCCH2)2NCH2CH2N(CH2COOH)2）〕←Mehlich（1984） Olsen：炭酸水素ナトリウム（NaHCO3）（pH=8.5）←Olsen et al.（1954） IIP：鉄酸化物含浸紙（Fe-oxide impregnated paper）←Chardon（2000） AER：陰イオン交換樹脂（anion exchange resin）←Sharpley（2000）

• Bray,R.H. and Kurtz,L.T.(1945): Determination of total, organic, and available forms of phoshorus in soils. Soil Sci., 59, 39-45.
• Chardon,W.J.(2000): Phosphorus extraction with iron-oxide impregnated filter paper (PI test). 26-29. In Pierzynski,G.M.(ed.), Methods for phosphorus analysis for soils, sediments, residuals, and waters. Southern Cooperative Aeries Bull. XXX.
• Mehlich,A.(1984): Mehlich 3 soil test extractant: A modification of Mehlich 2 extractant. Comm. Soil Sci. Plant An., 15, 1409-1416.
• Nelson,W.L., Mehlich,A. and Winters,E.(1953): The development, evaluation, and use of soil tests for phosphorus availability. Agronomy, 4, 153-188.
• Olsen,S.R., Cole,C.V., Watanabe,F.S. and Dean,L.A.(1954): Estimation of available phosphorus in soils by extraction with sodium bicarbonate. U.S. Dep. of Agric. Circ., 939.
• Sharpley,A.N., Daniel,T., Sims,T., Lemunyon,J., Stevens,R. and Parry,R.(1999): Agriculture phosphorus and eutrophication. ARS-149, U.S. Dep. of Agric., Washington, D.C.
• Sharpley,A.N., Smith,S.J., Jones,O.R., Berg,W.A. and Coleman,G.A.(1992): The transport of bioavailable phosphorus in agricultural runoff. J. Environ. Qual., 21, 30-35.