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 | ||
---|---|---|---|---|---|---|---|---|---|
Phosphonates | Mehlich III | Soil | 1 (2) | 2 (2) | 5 (1) | 5 (1) | 1 (1) | 2 (1) | 0 (1) |
NaOH-EDTA | Residue | 2 (2) | 2 (1) | 4 (1) | 8 (1) | 3 (2) | 3 (1) | 2 (1) | |
NaOH-EDTA | Soil | 2 (1) | 5 (1) | 5 (1) | 8 (1) | 5 (1) | 5 (1) | 3 (1) | |
Glucose 6-phosphate | Mehlich III | Soil | 1 (1) | 1 (1) | 0 (0) | 5 (1) | 1 (1) | 2 (1) | 0 (1) |
NaOH-EDTA | Residue | 2 (1) | 2 (1) | 4 (1) | 8 (1) | 1 (1) | 3 (1) | 2 (1) | |
NaOH-EDTA | Soil | 2 (1) | 2 (1) | 5 (1) | 8 (1) | 5 (1) | 5 (1) | 3 (1) | |
Choline phosphate | Mehlich III | Soil | 1 (1) | 1 (1) | 0 (0) | 5 (1) | 1 (1) | 0 (0) | 0 (1) |
NaOH-EDTA | Residue | 4 (1) | 5 (2) | 4 (1) | 8 (1) | 3 (1) | 3 (1) | 4 (1) | |
NaOH-EDTA | Soil | 5 (1) | 4 (1) | 5 (1) | 8 (1) | 2 (1) | 5 (1) | 3 (1) | |
Unknown 5.1 ppm | Mehlich III | Soil | 1 (1) | 1 (1) | 3 (1) | 5 (1) | 2 (2) | 0 (0) | 0 (1) |
NaOH-EDTA | Residue | 4 (1) | 5 (2) | 8 (1) | 8 (1) | 8 (4) | 6 (1) | 28 (9) | |
NaOH-EDTA | Soil | 11 (4) | 9 (3) | 10 (1) | 25 (2) | 15 (4) | 11 (1) | 10 (3) | |
Monoester 1 | Mehlich III | Soil | 1 (1) | 1 (1) | 3 (1) | 5 (1) | 1 (1) | 2 (1) | 0 (1) |
NaOH-EDTA | Residue | 2 (1) | 2 (1) | 4 (1) | 8 (1) | 1 (1) | 3 (1) | 2 (1) | |
NaOH-EDTA | Soil | 2 (1) | 4 (1) | 5 (1) | 8 (1) | 5 (1) | 5 (1) | 3 (1) | |
Monoester 2 | Mehlich III | Soil | 2 (4) | 3 (4) | 8 (2) | 30 (4) | 6 (6) | 3 (1) | 2 (5) |
NaOH-EDTA | Residue | 9 (4) | 18 (6) | 12 (2) | 91 (8) | 11 (5) | 6 (1) | 32 (10) | |
NaOH-EDTA | Soil | 21 (8) | 18 (5) | 14 (1) | 41 (4) | 25 (7) | 16 (2) | 25 (7) | |
Monoester 3 | Mehlich III | Soil | 2 (3) | 2 (2) | 3 (1) | 5 (1) | 2 (2) | 2 (1) | 0 (1) |
NaOH-EDTA | Residue | 2 (1) | 5 (1) | 4 (1) | 8 (1) | 3 (1) | 11 (3) | 4 (1) | |
NaOH-EDTA | Soil | 5 (2) | 7 (2) | 10 (1) | 8 (1) | 5 (1) | 5 (1) | 5 (1) | |
Degradation | Mehlich III | Soil | 3 (4) | 3 (3) | 3 (1) | 15 (2) | 5 (5) | 3 (1) | 1 (4) |
NaOH-EDTA | Residue | 23 (9) | 27 (9) | 20 (3) | 54 (5) | 17 (8) | 17 (4) | 68 (21) | |
NaOH-EDTA | Soil | 25 (9) | 24 (7) | 26 (4) | 58 (5) | 45 (13) | 27 (4) | 27 (8) | |
DNA | Mehlich III | Soil | 0 (0) | 0 (0) | 0 (0) | 1 (1) | 0 (0) | 0 (0) | 0 (0) |
NaOH-EDTA | Residue | 2 (1) | 2 (1) | 8 (1) | 1 (0) | 6 (3) | 4 (1) | 8 (2) | |
NaOH-EDTA | Soil | 3 (1) | 7 (2) | 2 (1) | 11 (1) | 3 (1) | 3 (0) | 3 (1) | |
Other orthophosphate diesters | Mehlich III | Soil | 1 (1) | 1 (1) | 2 (1) | 4 (1) | 1 (1) | 1 (1) | 1 (2) |
NaOH-EDTA | Residue | 3 (1) | 4 (1) | 17 (3) | 7 (1) | 6 (3) | 5 (1) | 21 (6) | |
NaOH-EDTA | Soil | 11 (4) | 10 (3) | 16 (2) | 21 (2) | 9 (3) | 8 (1) | 5 (1) | |
Total orthophosphate monoesters | Mehlich III | Soil | 27 (42) | 29 (34) | 37 (10) | 308 (46) | 21 (21) | 22 (9) | 6 (19) |
NaOH-EDTA | Residue | 70 (27) | 99 (32) | 117 (20) | 520 (47) | 60 (30) | 84 (21) | 117 (36) | |
NaOH-EDTA | Soil | 103 (36) | 129 (40) | 109 (15) | 385 (33) | 116 (34) | 133 (18) | 102 (28) | |
NaOH-EDTA | Difference | 33 (9) | 31 (7) | − 7 (− 5) | − 134 (− 15) | 55 (5) | 48 (− 4) | 16 (− 8) | |
Total orthophosphate diesters | Mehlich III | Soil | 4 (6) | 4 (5) | 5 (1) | 20 (3) | 6 (6) | 5 (2) | 2 (6) |
NaOH-EDTA | Residue | 29 11) | 33 (11) | 45 (8) | 62 (6) | 29 (14) | 25 (6) | 96 (29) | |
NaOH-EDTA | Soil | 39 (14) | 42 (13) | 49 (7) | 90 (8) | 57 (17) | 37 (5) | 35 (10) | |
NaOH-EDTA | Difference | 10 (3) | 9 (2) | 5 (− 1) | 28 (2) | 28 (3) | 12 (− 2) | − 61 (− 20) | |
Mono:Diester ratio | Mehlich III | Soil | 7.2 | 7.1 | 7.0 | 15.7 | 3.3 | 4.4 | 3.0 |
NaOH-EDTA | Residue | 2.4 | 3.0 | 2.6 | 8.4 | 2.1 | 3.3 | 1.2 | |
NaOH-EDTA | Soil | 2.6 | 3.1 | 2.2 | 4.3 | 2.0 | 3.6 | 2.9 |