SUPPRESSION OF HEAVY METAL ABSORPTION FROM SANDY PADDY FIELD SOIL TO PADDY RICE PLANT

摘要

PROBLEM TO BE SOLVED: To provide a method for suppressing the amount of a heavy metal absorption in terms of cadmium from a sandy paddy field having a poor water- holding property to a paddy rice plant for a long period of time. SOLUTION: This method for suppressing the heavy metal absorption is to mix ALC(aerated light weight concrete) particles containing =30-70 wt.% particles having 5-10 mm particle diameter as a cadmium absorption-suppressing agent with calcium carbonate in (1:2)-(2:1) ratio, and use the mixture in an amount of 500-5,000 kg/10 a in a sandy paddy field soil having a poor water- holding property. Preferably, the ALC is used in 1,000-3,000 kg/10a.