Do different agronomic soil tests identify similar nutrient deficiencies?

Traditionally, locally calibrated soil tests were used for fertilizer and lime recommendations. Farmers advisors are increasingly using new ‘universal’ without local calibration. The objective of this study was to compare five commercially available determine whether they would provide similar In total, 24 fields in Western Finland sampled 4 years while being treated with fertilizers, manure. samples analysed Mehlich-3, ammonium acetate, H3A, hydrochloric acid mild acetic (Spurway) extractants. addition, Soil Health Tool (CO2 burst, water-soluble C N) tissue testing conducted. different extracted orders magnitude nutrients (especially P Mg), but the results from extractions correlated. Mehlich-3 degree phosphorus saturation (DPS) presented a threshold, below which soluble not detected. Similar thresholds found P, S Mg. acetate provided Ca, Mg K can be interchangeably liming identified more Zn, Cu, B deficiencies less Mn compared + EDTA testing. had strong correlation, determination nutrient needs calibration deficiency limits.