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Table 5 Critical levels of macro and micronutrients with different soil tests as reported by different authors

From: Soil fertility status and wheat nutrient content in Vertisol cropping systems of central highlands of Ethiopia

Elements Method used Critical levels References
P Olsen 10–17 mg kg−1 [32]
K NH4OAc, pH = 7 0.3–0.7 cmol kg−1 [47]
Ca NH4OAc, pH = 7 5–10 cmol kg−1 [47]
Mg NH4OAc, pH = 7 1–3 cmol kg−1 [47]
Sulfate-S CaCl2 5 mg kg−1 [55]
Cu AB-DTPA 0.5 mg kg−1 [56, 57]
Fe AB-DTPA 5 mg kg−1 [56, 57]
Mn AB-DTPA 1 mg kg−1 [56, 57]
Zn AB-DTPA 1.5 mg kg−1 [56, 57]
Mo AAO 0.1–0.5 mg kg−1 [35, 58]
B Mehlich 3 0.5–1 mg kg−1 [58, 59]