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Phosphorus dynamics in a long‐term P fertilization trial on Luvic Phaeozem at Halle
Author(s) -
Gransee Andreas,
Merbach Wolfgang
Publication year - 2000
Publication title -
journal of plant nutrition and soil science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.644
H-Index - 87
eISSN - 1522-2624
pISSN - 1436-8730
DOI - 10.1002/1522-2624(200008)163:4<353::aid-jpln353>3.0.co;2-b
Subject(s) - subsoil , fertilizer , soil water , human fertilization , phosphorus , chemistry , agronomy , zoology , environmental science , biology , soil science , organic chemistry
The soil of the long‐term experiment laid out 1949 in Halle has the potential to supply much P. The P taken up by plants where no P (P0) or 15 kg ha −1 yr −1 (P1) was applied was much greater than the P applied as fertilizer (P1). A decrease in yield was measured only after the first 25 years on P0 soils but the P1 treatment has, so far, shown no decrease. Lactate extractions of the soil did not reflect P‐uptake suitably. The release of P from insoluble into water soluble forms was at a minimum after 30 years in P0 soils. P1 soils have now also declined to this minimum value and it remains to be seen whether yields decrease in this treatment in the future. Parallel to this trend, the P sorption increased in P0 soils. The subsoil also seems to be an important source for P supply, possibly influenced by root exudates. Further work is needed to gain a better understanding of soil P dynamics in connection with root exudates and microbes and to identify parameters which will provide more reliable means of calculating fertilizer P requirements.