Table 3. Apparent applied P recovery efficiency (PRE) and apparent P balance (APB) as affected by P fertilization rates and cropping systems over the three years.
| Treatment | PRE (%) | APB (kg P ha-1) | ||||||
|---|---|---|---|---|---|---|---|---|
| Wheat | Maize | W-S | W/M/S | Wheat | Maize | W-S | W/M/S | |
| P 0 | - | - | - | - | -28.4 | -15.2 | -37.2 | -51.9 |
| P 1 | 33.1 a | 20.7 a | 48.5 a | 35.9 a | -12.2 | -3.7 | -22.7 | -26.1 |
| P 2 | 19.8 b | 28.2 a | 27.7 b | 28.0 ab | 3.5 | 9.3 | -8.3 | 0.2 |
| P 3 | 18.2 b | 21.5 a | 24.7 b | 23.2 b | 23.7 | 25.4 | 11.3 | 36.2 |
| P 4 | 11.4 b | 10.4 b | 13.9 c | 12.3 c | 43.2 | 41.4 | 31.3 | 72.2 |
| Mean | 20.6 | 20.2 | 28.7 | 24.8 | 29.8 | 56.9 | -25.6 | 30.6 |
Values are means of 4 replicates. Different lower-case letters indicate significant difference (P<0.05) by LSD between different P application rates. W-S and W/M/S indicate wheat-soybean strip and wheat/maize/soybean relay strip intercropping system respectively.