Fig. 4. (a) Dry matter yield of mustard plants and (b) the concentration of total Cr in plant tissue at various levels (g organic carbon kg-1 soil) of biosolid compost addition (•, 0; 
, 25; 
, 50; 
, 100).
Fig. 4. (a) Dry matter yield of mustard plants and (b) the concentration of total Cr in plant tissue at various levels (g organic carbon kg-1 soil) of biosolid compost addition (•, 0; , 25; , 50; , 100).