Table 6 Pearson correlation (p) coefficient of total LMWOA and individual organic acids with water extractable P, and P sorption where significant results are marked with asterisk (*).
From: Soil phosphorus availability as affected by root exudates of cover crop species
Correlation | Water extractable P | P sorption | ||||||
|---|---|---|---|---|---|---|---|---|
35 days | 70 days | 35 days | 70 days | |||||
No-P | P addition | No-P | P addition | No-P | P addition | No-P | P addition | |
Total LMWOA | − 0.24 | − 0.23 | 0.05 | 0.77** | 0.04 | 0.17 | − 0.19 | − 0.39 |
Citric acid | 0.63* | − 0.15 | 0.44 | − 0.48 | 0.09 | 0.28 | − 0.09 | 0.48 |
Malic acid | 0.38 | − 0.09 | 0.23 | − 0.34 | 0.16 | 0.53 | 0.13 | 0.49 |
Oxalic acid | − 0.68* | 0.08 | − 0.35 | 0.56 | 0.24 | − 0.5 | − 0.35 | − 0.56 |
Tartaric acid | 0.63* | − 0.15 | 0.29 | − 0.46 | 0.09 | 0.28 | 0.45 | 0.47 |
Succinic acid | 0.51 | 0.03 | − 0.02 | − 0.31 | 0.27 | 0.24 | 0.57 | 0.73* |
Maleic acid | 0.90*** | − 0.08 | 0.54 | − 0.08 | − 0.21 | − 0.33 | 0.37 | 0.22 |
Fumaric acid | 0.27 | 0.09 | 0.01 | 0.01 | 0.31 | 0.02 | 0.53 | 0.51 |
Formic acid | 0.13 | 0.12 | 0.00 | − 0.31 | 0.31 | − 0.21 | − 0.21 | − 0.21 |
