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Comparison of phosphorus, potassium, and magnesium contents determined with the universal, Egner-Riehm and Schachtschabel methods in orchard soils

Andrzej Komosa, Anna Stafecka

Department of Horticultural Plant Nutrition
Agricultural University of Poznań
Zgorzelecka 4, 60-198 Poznań, Poland
e-mail: ankom@au.poznan.pl

The study was carried out in six orchards of Wielkopolska in the years 1997-1999. The content of phosphorus and potassium determined with the Egner-Riehm and magnesium with the Schachtschabel methods was compared to the universal method (0.03 M CH3COOH extract). It was indicated that the mean contribution of phosphorus (PU), potassium (KU), and magnesium (MgU) determined by the universal method in relation to those of Egner-Riehm (PER) - (KER) and Schachtschabel (MgS) in orchard soils was 46.7%, 51.6%, and 71.3%, respectively. The contribution of PU and MgU was lower in the herbicide strips and amounted to 45.5% and 62.9%, respectively, than in the grass ones - 47.9% and 79.7%. The contribution of KU was higher in the herbicide strips - reached 53.2% but in the grass ones it was 50.0%. With the increase in the depth soil sampling (0-20 and 20-40 cm) reduced the portion of KU with respect to KER both in the herbicide and grass strips. No similar relationships were found for phosphorus and magnesium. Mean coefficients of recalculating the results from the universal into the Egner-Riehm and Schachtschabel methods are: P 2.14 (1.87-2.60), K 1.94 (1.79-2.28), Mg 1.40 (1.18-1.62); inversely: P 0.47 (0.38-0.54), K 0.52 (0.44-0.56), Mg 0.71 (0.62-0.85). Correlations were indicated between the determinations carried out with the universal and the Egner-Riehm and Schachtschabel methods. They were higher for phosphorus (0.69-0.94) and potassium (0.70-0.93) than for magnesium (0.29-0.42). The correlation coefficients varied depending on the method of soil cultivation in the orchard (herbicide, grass strips) and the depth of the analysed soil layers (0-20 and 20-40 cm). The study proved that the universal method can be successfully applied to chemical analyses of orchard soils.

Komosa A., Stafecka A., 2003. Comparison of phosphorus, potassium, and magnesium contents determined with the universal, Egner-Riehm and Schachtschabel methods in orchard soils. Folia Horticulturae 15/2: 137-149.