P availability indexes (%)c     Dry matter yields (g/pot)
Sources of Pa CaCO3ratesb Mehlich 3 Oxalate ECd (dS/cm) Tailing pH Tops Roots
MKP Ca1 41.9 3.2 2.26 4.2 5.06 3.12
  Ca2 49.5 2.5 2.3 6.35 14.8 8.31
  Ca3 37.5 3 2.21 7.2 13.25 6.57
PSC Ca1 42 3.4 2.32 5.55 15.78 8.78
  Ca2 48.7 3 2.29 6.5 17.04 10.92
  Ca3 42 3.2 2.54 7.16 15.31 9.46
BF Ca1 37.9 2.9 2.01 4.83 9.32 5.9
  Ca2 42.6 2.4 2.28 5.88 15.53 8.92
  Ca3 32.7 3.3 2.34 7.14 14.03 8.44
Table 1: Chemical properties of tailing samples as affected by the rate application of calcium carbonate and three sources of phosphorus aMKP: KH2PO4; PSC: peat-shrimp wastes compost; BF: peat flour. Rate of P application: 22.4, 44.8 and 89.6 mg P/pot (same for all P sources); bCa1 , Ca2 and Ca3: 11, 17 and 30 g of CaCO3/pot, respectively; cExpressed as percentage of tailing total P content; dElectrical conductivity of the tailing aqueous extract