ISSN:
1573-5036
Source:
Springer Online Journal Archives 1860-2000
Topics:
Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
Notes:
Summary and Conclusions Phosphorus available to soil organisms in 40 noncalcareous soils was estimated by an isotope-dilution method. The dependence of phosphorus availability on pH, organic phosphorus synthesized during incubation, and four different phosphorus fractions was investigated using techniques of multiple linear regression. Only organic phosphorus synthesized during incubation and inorganic phosphorus extracted from the soils by the dilute NH4F-HCl extractant of Bray and Kurtz were of significance in predicting soil phosphorus available to soil organisms. It was presumed that the observed relationship between phosphorus availability and organic phosphorus synthesis resulted from a correlation of the latter with organic phosphorus mineralization. Data on 22 soils showed that preincubation decreased both synthesis of organic phosphorus and phosphorus available to soil organisms. Data on 18 soils showed that measurements of plant-available phosphorus by the technique of Fried and Dean depended significantly on the inorganic phosphorus extracted by the Bray and Kurtz method; they did not depend significantly on organic phosphorus synthesized during incubation. In the same soils, however, phosphorus available to soil organisms depended significantly on both synthesized organic phosphorus and Bray and Kurtz inorganic phosphorus. The difference between higher plants and soil organisms in this respect may have resulted from the more intimate operational and positional association of the latter with organic phosphorus mineralization.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1007/BF01393755
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