Table 3 The effect of treatments on the accumulation of different P fractions in the 0–20 cm soil depth (kg ha−1).

From: Long-term application of fertilizer and manures affect P fractions in Mollisol

Treatment

LOP

MLOP

MSOP

HSOP

Ca2-P

Ca8-P

Al-P

Fe-P

O-P

Ca10-P

CK

33.24a

372.14b

416.95b

597.01b

13.09c

20.82c

22.28b

159.69c

255.50a

146.13a

NPK

35.36a

399.71b

453.63b

661.35a

81.05b

114.34b

59.03a

304.60b

323.27a

133.97a

OM

49.67a

442.88a

546.43a

667.37a

104.93a

224.62a

61.52a

506.98a

292.23a

170.54a

NPK + S

44.72a

365.29b

443.57b

647.50a

28.78c

41.15c

76.83a

237.13bc

278.66a

141.71a

  1. Values followed by different letters at the same row differ significantly at P < 0.05.
  2. CK, no fertilizer application; NPK, chemical fertilizer application; NPK + S, chemical fertilizer plus maize straw incorporation; OM, organic manure application.
  3. LOP, labile organic P; MLOP, moderately labile organic P; MSOP, moderately stable organic P; HSOP, high stable organic P.
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