Fig. 4. Relationships between soil properties, climate variables (mean annual precipitation [mm] and temperature [°C]) and organic P determined by bicarbonate extraction and molybdate colorimetry, and by NaOH–EDTA extraction and solution ³¹P NMR spectroscopy (mg P kg^-1 soil). Outlying soils not included in the calculation of correlation coefficients are identified as shaded circles.

Return to article