Abstract: Based on pot culture experiment,the effect of fly ash filtered mud mixture on soil biochemical properties,radish yield, its quality,and heavy metal accumulation in both soil, radish was examined.The mixture was made by mixing fly ash, filtered mud in proportion 1:1(w/w), adding small amount of inorganic fertilizer.Its Cd,Pb,Cr,As, Hg contents were much lower than those requested by state control criteria.After applying this mixture in a definite amount,no significant accumulation of heavy metals was found in both soil, radish,the pollution index of heavy metals was <1,the quantities of soil bacteria increased notably,and the activities of soil urease,phosphates, cellu2 losase also raised significantly.The application of the mixture promoted radish growth, its development, metabolism.The reducing sugar, vitamin C in radish also increased markedly.The results indicated that the use of adequate amounts of the mixture did not cause any obvious heavy metal pollution in both soil, radish,but could im2prove soil fertility,and raise radish yield, its quality remarkably.

Key words: Fly ash, Filtered mud, Soil properties, Heavy metal accumulation, Radish yield, quality