RADIOCESIUM CONCENTRATION IN STEMS, LEAVES, AND PANICLES OF RICE GROWN IN A SANDY SOIL REPLACEMENT PADDY FIELD TREATED WITH DIFFERENT RATES OF CATTLE MANURE COMPOST IN KAWAMATA, FUKUSHIMA

Abstract

had the surface soil removed and replaced by sandy soil . The cattle manure compost was used to improve soil fertility. The objectives of this study were to determine the effects of cattle manure compost application at rates of 0 (control), 10, 20 and 40 t ha - 1 on rice yields and on 137 Cs transfer to stems, leaves and panicles of rice in 2015. Results showed that rice yields were increased with rates of cattle manure compost. Application of cattle manure compost caused the increase of exchangeable potassium (K) in the soil, resulting in reduction of 137 Cs in rice parts. The 137 Cs concentration was higher in stems than in leaves and was not detected in panicles . The 137 Cs concentration in the aboveground parts of rice was decreased to the lowest (TF = 0 . 009) in soil that received 20 t ha - 1 of cattle manure compost, which was 2 . 4 times lower than that in the control . The transfer factor of 137 Cs (TF) in aboveground parts of rice was negatively correlated with exchangeable K in the soil . The ratio of 137 Cs / K was higher in stems than in leaves and that was related to the concentration of exchangeable Ca, and Mg in the soil . The results indicated that exchangeable K, Ca and Mg derived from cattle manure compost affected the uptake and distribution of 137 Cs in rice plants .