Table 1 General chemical properties of soils after harvest
From: Application of ionomics to plant and soil in fields under long-term fertilizer trials
|  | NH4–N (µg g−1) | Total N (mg g−1) | Truog P (mg P2O5 kg−1) | Total P (mg g−1) | Exchangeable K (µg g−1) | Total K (µg g−1) | pH (H2O) |
|---|---|---|---|---|---|---|---|
+NPK | 53.8 ± 3.1 a | 2.26 ± 0.04 ab | 306.3 ± 10.4 a | 1.86 ± 0.03 ab | 425 ± 18 b | 1143 ± 15 ab | 5.34 ± 0.11 b |
−N | 54.9 ± 2.9 a | 1.85 ± 0.06 c | 261.1 ± 25.4 a | 1.74 ± 0.06 b | 747 ± 60 a | 1554 ± 76 a | 5.54 ± 0.05 ab |
−P | 57.5 ± 2.7 a | 2.09 ± 0.07 bc | 22.1 ± 3.1 b | 0.83 ± 0.03 c | 706 ± 23 a | 1479 ± 25 a | 5.28 ± 0.08 b |
−K | 56.7 ± 1.8 a | 2.55 ± 0.06 a | 317.3 ± 14.5 a | 2.11 ± 0.03 a | 114 ± 5 c | 943 ± 6 c | 5.31 ± 0.07 b |
−NPK | 53.4 ± 2.2 a | 1.92 ± 0.05 c | 26.1 ± 0.4 b | 0.82 ± 0.03 c | 125 ± 8 c | 966 ± 31 bc | 5.76 ± 0.05 a |