Fig. 3

Concentrations of Cd (a–d) and As (e–h) in different parts of rice plants under different organic compost dosage treatments. Significant differences were indicated by different lower-case letters (ANOVA, P < 0 0.05). NPK: all N is supplied by urea, 25PM: 25% of N by pig manure compost and 75% of N by urea, 50PM: 50% of N by pig manure compost and 50% of N by urea, 75PM: 75% of N by pig manure compost and 25% of N by urea, PM: all N is supplied by pig manure compost.