Table 2 Change in total P and Olsen-P affected by different fertilization modes in the surface soil layer (0–20 cm) over time.
Items | Treatments | Soil P content (mg·kg−1) over time (years) | ||||
---|---|---|---|---|---|---|
2009 | 2010 | 2011 | 2012 | 2013 | ||
Olsen-P | OM | 54.96 ± 7.07aA | 57.35 ± 9.85aA | 62.50 ± 15.28aA | 72.74 ± 15.46aA | 86.04 ± 14.53aA |
CF | 55.33 ± 11.41aA | 56.44 ± 10.34aA | 58.42 ± 13.05aA | 65.58 ± 15.10bA | 72.40 ± 10.16bB | |
CK | 54.72 ± 8.58aA | 51.23 ± 6.42aA | 46.22 ± 10.46bB | 34.09 ± 10.44cB | 19.53 ± 7.42cC | |
Total P | OM | 1327.36 ± 86.45aA | 1326.49 ± 72.48aA | 1358.36 ± 82.51aA | 1402.47 ± 77.52aA | 1488.04 ± 105.27aA |
CF | 1332.46 ± 90.37aA | 1325.37 ± 117.33aA | 1348.32 ± 134.26bA | 1362.41 ± 154.62bB | 1392.56 ± 152.30bB | |
CK | 1321.27 ± 45.28aA | 1320.48 ± 50.42aA | 1321.32 ± 62.37cB | 1319.46 ± 66.48cC | 1317.70 ± 72.35cC |