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- W1986999586 abstract "In Labor- und Gefäßversuchen wurde die Phosphatverfügbarkeit in Thüringer Carbonatböden und deren Charakterisierung durch die CAL-, NaHCO3-, H2O- und CaCl2-Methode untersucht. CaCO3-Gehalte des Bodens > 10% bewirken einen Anstieg des pH-Wertes der CAL-Lösung während der Extraktion und eine erheblich verminderte P-Extraktion. Der Anstieg der pH-Werte der Extrak-tionslösungen verursacht auch bei Anwendung der H2O- und der CaCl2-Methode die Unterbewertung des pflanzenverfügbaren Bodenphosphats. Zur Prognose der P-Aufnahme von Mais im Gefäßversuch war der CAL-lösliche P-Gehalt des Bodens unter Berücksichtigung des pH-Wertes der Extraktionslösung am besten geeignet. Aus beiden Parametern können für Carbonatböden P-Gehalte errechnet werden, die der P-Verfügbarkeit von Böden < 5% CaCO3 entsprechen. Die Gleichung lautet CAL-Pkorrigiert = CAL-Pgemessen · (1 + 0.83·〈pH-WertCAL-Lösung — 4,1〉) und wird in Feldversuchen überprüft. Investigations on the characterization of plant available phosphate in Thuringian calcareous soils Phosphate availability in Thuringian calcareous soils and its characterization by CAL‒, NaHCO3-, H2O- and CaCl2-soil tests was investigated in laboratory and pot experiments. Soil CaCO3 contents > 10% increase the pH value of CAL solution and thus decrease phosphate extractability. The increase of pH also causes an inadequate assessment of plant available phosphate by H2O- and CaCl2-soil tests. The CAL soluble P content of the soil corrected by the pH value of the extraction solution was most suitable for the forecast of P uptake of corn in a pot trial. From both parameters P availability indices for calcareous soils can be calculated which are comparable with those in soils containing < 5% CaCO3. The equation, which still has to be verified in field experiments, reads as CAL-Pcorrected = CAL-Pmeasured · (1 + 0.83·〈pH-valueCAL solution — 4.1〉)." @default.
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- W1986999586 date "1999-10-01" @default.
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- W1986999586 title "Untersuchungen zur Charakterisierung des pflanzenverfügbaren Phosphats in Thüringer Carbonatböden" @default.
- W1986999586 doi "https://doi.org/10.1002/(sici)1522-2624(199910)162:5<463::aid-jpln463>3.0.co;2-3" @default.
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