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The availability of soil phosphate. II.—Comparison of extraction methods
Author(s) -
Yuen S. H.,
Pollard A. G.
Publication year - 1951
Publication title -
journal of the science of food and agriculture
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.782
H-Index - 142
eISSN - 1097-0010
pISSN - 0022-5142
DOI - 10.1002/jsfa.2740020506
Subject(s) - lime , phosphate , phosphate fertilizer , fertilizer , extraction (chemistry) , soil test , ammonium phosphate , soil water , crop , agronomy , environmental science , zoology , toxicology , chemistry , biology , soil science , paleontology , organic chemistry , chromatography
Comparison is made of the Dyer, Truog and Morgan tests for available phosphate in soils using long‐term fertilizer trial plots. All three tests recorded the cumulative effects of annual applications of superphosphate and the more marked effects of dung; however, the actual values indicated by the tests differed. The Truog and Morgan methods, but not the Dyer test, reflected the depressive effect of ammonium sulphate and the beneficial effect of lime on phosphate availability. Test data are compared with the recovery of phosphate by a flax crop. A seasonal variation in the available phosphate in soil was indicated, notably by the Morgan and Truog tests: it was more marked in plots receiving annual dressings of superphosphate than in those receiving dung, untreated controls occupying an intermediate position in this respect.