The experiment was conducted at Nihonmatsu City, Fukushima Prefecture during June to August 2012. The 137Cs content of the study soil ranged from 1609 to 2322 Bq kg-1. The soil amendment treatments included ii) No soil amendment, ii) No organic amendment but with PGPR, (iii) Organic compost (0.5 kg m-2), (iv) Organic compost (0.5 kg m-2) and PGPR, (v) Organic compost (1 kg m-2), (vi) Organic compost (1 kg m-2) and PGPR. The cruciferous crops tested were two kinds of leafy vegetable komatsuna and mustard and two kinds of root vegetable Japanese radish and turnip.
The water soluble fraction and ion exchangeable fraction were less than 10%, while fraction fixed to clay were more than 50%. Compost amendment alone increased growth and total 137Cs uptake, while reducing the content. PGPR application alone did not promote growth but increased the 137Cs content as well as total uptake. The combination of compost and PGPR increased the plant growth and reduced the 137Cs content and total 137Cs uptake. The use of organic materials should be further investigated on the fate of 137Cs contained in the organic fraction.