2. Methods
2.1. Sample collection
Pb/Zn mine tailings and Cu mine tailings were collected from Lechang Pb/Zn mine tailings ponds and Dabao Shan mine tailings ponds at 0–20 cm depths, respectively. Manure compost was collected from a pig farm belonging to Agricultural, Fisheries, and Conservation Department (AFCD, HKSAR) in Sheung Shui. The compost contained pig manure primarily and sawdust, and was fully matured (compost which undergoes adequate decomposition). Sewage sludge (digested sludge) was collected from the Tai Po Sewage Treatment Works, Hong Kong. The N, P, and K fertilizer (N:P:K = 1.5:1.0:1.25) was made of chemicals in 0.621 g ammonium nitrate (NH4NO3) and 0.636 g potassium phosphate (KH2PO4) (Ye et al., 1999). All samples were air-dried and filtered through a 2 mm mesh sieve and mixed well.
2. Methods2.1. Sample collectionPb/Zn mine tailings and Cu mine tailings were collected from Lechang Pb/Zn mine tailings ponds and Dabao Shan mine tailings ponds at 0–20 cm depths, respectively. Manure compost was collected from a pig farm belonging to Agricultural, Fisheries, and Conservation Department (AFCD, HKSAR) in Sheung Shui. The compost contained pig manure primarily and sawdust, and was fully matured (compost which undergoes adequate decomposition). Sewage sludge (digested sludge) was collected from the Tai Po Sewage Treatment Works, Hong Kong. The N, P, and K fertilizer (N:P:K = 1.5:1.0:1.25) was made of chemicals in 0.621 g ammonium nitrate (NH4NO3) and 0.636 g potassium phosphate (KH2PO4) (Ye et al., 1999). All samples were air-dried and filtered through a 2 mm mesh sieve and mixed well.
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