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P‐Dynamik weicherdiger Rohphosphate und Probleme der Bodenuntersuchung
Author(s) -
Gutser R.,
Amberger A.
Publication year - 1971
Publication title -
zeitschrift für pflanzenernährung und bodenkunde
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.644
H-Index - 87
eISSN - 1522-2624
pISSN - 0044-3263
DOI - 10.1002/jpln.19711300303
Subject(s) - phosphorus , fractionation , chemistry , phosphate , soil water , environmental chemistry , calcium , phosphorite , environmental science , soil science , biochemistry , chromatography , organic chemistry
The Phosphorus Dynamics of Soft Raw Phosphate and Soil Investigation Problems In long term trials with a brown earth, pH 6.2 and a pseudogley, pH 4.9 and 6.0 when limed, yield and phosphorus uptake were compared with available phosphorus, as estimated by different methods, including Chang and Jackson's phosphorus fractionation. The evaluation of soil investigations depends very much on the dynamics of the site, especially when soft raw phospates are being examined. The rate of availability to plants of apatite rock phosphates depends on pH, the biological activity of the soil and on its transformation power. Soft raw phosphates lead to increased levels of calcium phosphates in soils of higher pH. Available phosphorus is often over estimated in soils where P transformation is in fact low due to the ready extractability of calcium phosphates inherent in some methods. This especially applies to the lactate ( Egner‐Riehm ) and the lactate‐acetate ( Egner‐Riehm‐Domingo ) methods. Soil testing methods must be verified against plant trials. Soil type and nutrient dynamics must be considered to give accurate evaluation; Chang and Jackson's phosphorus fractionation is helpful.