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A Comparison of Field Methods for Determining the Available Phosphorus of Soils 1
Author(s) -
Engberg Clarence A.,
Spurway Chas. H.
Publication year - 1933
Publication title -
agronomy journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.752
H-Index - 131
eISSN - 1435-0645
pISSN - 0002-1962
DOI - 10.2134/agronj1933.00021962002500050008x
Subject(s) - citation , library science , soil water , permission , state (computer science) , sociology , computer science , political science , law , environmental science , soil science , algorithm
Considerable progress has been made in recent years in the development of methods for determining the quantities of soluble, or the socalled available phosphorus contained in field soils. Several of these methods have been developed quite recently and a comparison of some of them, using soil samples from unfertilized field plats and plats fertilized with phosphatic fertilizers, is the object of this paper. In the determination of available phosphorus in soils the several workers have used different methods of extracting the phosphorus. In England and some European countries a i% citric acid solution has been used as the standard extracting solution. In the United States the solutions commonly used for extracting soil phosphorus are o.2N nitric acid, very dilute sulfuric acid, hydrochloric acid, and water. Truog (3, 4)* has proposed a laboratory method which has been used extensively in Wisconsin for the determination of available phosphorus in soils. A o.ooaN sulfuric acid solution buffered to a pH of 3 is used in his method for extracting the soil samples. Truog