Table 1 Chemical determinations on plant residues used as composting feedstock
| Â | Chemical features | |||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|
Residues | N (%) | P (%) | K (%) | Ca (%) | Mg (%) | Na (%) | Mn (ppm) | Cd (ppm) | Cr (ppm) | Cu (ppm) | Pb (ppm) | Zn (ppm) |
Tomato | 2.1 | 0.0062 | 3.04 | 1.46 | 0.20 | 0.57 | 140.94 | 0.253 | 32.33 | 55.81 | 1.06 | nd |
Escarole | 3.8 | 0.0154 | 3.09 | 1.01 | 0.17 | 0.33 | 35.71 | 0.166 | 4.31 | 112.75 | nd | nd |
Woodchip | 1.0 | 0.0004 | 0.06 | 0.39 | 0.06 | 0.12 | 7.96 | 0.143 | 6.71 | 5.42 | nd | nd |