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Table 2 Main chemical quality characteristics of the composts

From: Effects of on-farm composted tomato residues on soil biological activity and yields in a tomato cropping system

  Chemical features
Composts pH EC (mS cm −1 ) N (%) P (%) K (%) Ca (%) Mg (%) Na (%) Mn (ppm) Cd (ppm) Cr (ppm) Cu (ppm) Pb (ppm) Zn (ppm)
C1 8.40 2.69 1.25 0.023 1.46 3.87 1.02 0.20 328.99 0.47 34.80 40.16 4.17 64.62
C2 8.19 4.12 1.23 0.020 1.21 5.32 1.25 0.15 297.42 0.51 34.84 55.68 4.58 108.50
C3 8.12 5.09 1.41 0.045 1.99 4.43 1.18 0.22 415.18 0.45 57.96 52.96 4.87 140.40
C4 8.31 8.92 1.52 0.048 1.92 4.90 1.23 0.15 260.96 0.58 17.99 45.02 3.09 57.06
COW 8.93 5.07 2.72 0.029 1.18 6.58 0.40 0.27 427.30 0.30 16.05 45.98 28.15 247.40
Legal limits           <1.5 <100 <150 <140 <500