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Table 7 Inositol hexaphosphate (IHP) stereoisomer concentrations, determined by solution P-NMR or mass spectrometry

From: Characterizing the phosphorus forms extracted from soil by the Mehlich III soil test

  Extractant   AR-control AR-N AR-PL AR-PL-alum SK PEI Till Ref
myo-IHP Mehlich III Soil 14 (22) 12 (15) 11 (3) 219 (33) 5 (5) 7 (3) 2 (5)
NMR NaOH-EDTA Residue 32 (13) 40 (13) 48 (8) 336 (31) 17 (8) 32 (8) 26 (8)
  NaOH-EDTA Soil 39 (14) 62 (19) 29 (4) 229 (19) 34 (10) 43 (6) 30 (8)
  NaOH-EDTA Difference 7 (1) 21 (6) − 19 (− 4) − 107 (− 11) 18 (2) 10 (3) 3 (0)
scyllo-IHP Mehlich III Soil 4 (6) 3 (4) 3 (1) 10 (2) 1 (1) 2 (1) 1 (2)
NMR NaOH-EDTA Residue 4 (1) 7 (2) 4 (1) 15 (1) 7 (3) 11 (3) 9 (3)
  NaOH-EDTA Soil 7 (3) 11 (3) 10 (3) 16 (1) 7 (2) 16 (2) 10 (3)
neo-IHP Mehlich III Soil 0 (1) 1 (1) 3 (1) 5 (1) 1 (1) 2 (1) 0 (1)
NMR NaOH-EDTA Residue 2 (1) 2 (1) 4 (1) 0 (0) 1 (1) 3 (1) 2 (1)
  NaOH-EDTA Soil 2 (1) 2 (1) 5 (1) 8 (1) 2 (1) 5 (1) 3 (1)
chiro-IHP Mehlich III Soil 2 (3) 3 (4) 5 (1) 20 (3) 2 (2) 3 (1) 1 (3)
NMR NaOH-EDTA Residue 11 (4) 13 (4) 24 (4) 39 (4) 7 (4) 8 (2) 7 (2)
  NaOH-EDTA Soil 9 (3) 11 (3) 20 (3) 33 (3) 15 (4) 21 (3) 13 (4)
Total IHP Mehlich III Soil 20 (31) 20 (24) 21 (6) 254 (38) 9 (9) 14 (6) 3 (10)
NMR NaOH-EDTA Residue 48 (19) 63 (21) 81 (13) 390 (35) 32 (16) 54 (14) 44 (13)
  NaOH-EDTA Soil 57 (20) 86 (26) 62 (8) 286 (24) 59 (17) 85 (11) 54 (15)
  NaOH-EDTA Difference 8 (1) 23 (6) − 18 (− 5) − 104 (− 11) 27 (2) 31 (− 3) 11 (2)
Total IHP Mehlich III Soil 11 (17) 4 (5) 9 (3) 46 (7) 1 (< 1) 6 (3) 1 (1)
Mass spec. NaOH-EDTA Residue 47 (19) 51 (15) 52 (8) 354 (32) 29 (15) 58 (15) 37 (11)
  NaOH-EDTA Soil 60 (20) 66 (20) 59 (9) 329 (29) 38 (20) 68 (17) 39 (11)
  1. Values are concentration in mg kg−1 (percentage of extract P). Residue is the residual soil after Mehlich III extraction. Total inorganic P is the sum of orthophosphate, pyrophosphate and polyphosphate. Difference is the difference in between the NaOH-EDTA extracts of whole soils and the NaOH-EDTA extracts of the residue after Mehlich III extraction
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