Table 4 Changes in the concentration of inorganic Pi in the surface soil layer (0–20 cm) as affected by different fertilization modes (mg·kg−1).

From: Effects of the continuous use of organic manure and chemical fertilizer on soil inorganic phosphorus fractions in calcareous soil

Time

Fertilization mode

Ca2-P

Ca8-P

Al-P

Fe-P

O-P

Ca10-P

Sum of the fractions

2009

OM

55.84 ± 8.34aA

68.42 ± 12.46aA

162.24 ± 25.57aA

183.43 ± 18.33aA

472.46 ± 38.42aA

51.65 ± 6.28aA

994.04aA

CF

56.42 ± 10.57aA

67.75 ± 12.58aA

161.53 ± 32.14aA

178.16 ± 23.49aA

467.56 ± 41.64aA

51.86 ± 7.46aA

983.28aA

CK

58.06 ± 5.10aA

65.01 ± 7.35aA

157.9 ± 18.62aA

177.24 ± 15.24aA

468.65 ± 32.16aA

51.43 ± 3.15aA

978.29aA

2013

OM

140.99 ± 21.38aA

293.36 ± 35.24aA

196.77 ± 36.22bB

198.38 ± 21.48aA

475.01 ± 42.10bAB

52.02 ± 15.34aA

1356.53aA

CF

102.4 ± 20.84bB

107.25 ± 18.47bB

333.77 ± 75.41aA

201.51 ± 28.36aA

521.87 ± 51.27aA

51.77 ± 17.28aA

1318.57aA

CK

16.37 ± 2.41cC

31.93 ± 9.37cC

127.15 ± 20.54cC

178.96 ± 15.47bA

455.88 ± 23.10bB

51.49 ± 8.47aA

861.78bB

  1. Note: The different lowercase and uppercase letters in the same column for each year indicate a significant difference at the 0.05 and 0.01 levels, respectively.
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