Table 4 Classification of soil P leaching risk in arid agricultural soils and paddy soils
Risk level | Profile depth | No risk | Low risk | Medium risk | High risk |
|---|---|---|---|---|---|
|  | (cm) | (mg kg−1) | |||
Arid agricultural soils | 0–20 |  ≤ 59.63a | 59.63 ~ 119.26 | 119.26 ~ 178.89 |  > 178.89 |
20–40 |  ≤ 24.31 | 24.31 ~ 48.62 | 48.62 ~ 97.24 |  > 97.24 | |
40–60 |  ≤ 32.91 | 32.91 ~ 65.82 | 65.82 ~ 131.64 |  > 131.64 | |
Paddy soils | 0–20 |  ≤ 35.35 | 35.35 ~ 70.70 | 70.70 ~ 106.05 |  > 106.05 |
20–40 |  ≤ 17.20 | 17.20 ~ 34.40 | 34.40 ~ 68.80 |  > 68.80 | |
40–60 |  ≤ 10.45 | 10.45 ~ 20.90 | 20.90 ~ 41.80 |  > 41.80 | |