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Various types of organic materials could affect differently immobilization of cadmium (Cd) and its uptake by plant grown in soil. Therefore, this study was conducted to evaluate effect of different organic materials in reducing Cd phytoextractability in contaminated arable soil. To do this, rice straw and composted manure were selected as organic materials and applied at the rate of 0, 15, 30, and 45 Mg ha-1 in Cd contaminated arable soil with 6.5 mg kg -1 of total Cd. Radish (Raphanus sativa L.) was seeded and grown for 50 days to evaluate Cd phytoavailability with different organic materials. Composted manure was more effective to decrease 1 M NH₄OAc extractable Cd concentration and increase pH of soil than rice straw. One M NH₄OAc extractable Cd concentration significantly decreased with increasing application rate of composted manure. Tendency of Cd uptake by radish plant with application of different organic materials was similar to that of 1 M NH₄OAc extractable Cd concentration and soil pH. Changes of soil pH with application of straw and composted might be one of factors to determine extractability and phytoavailability of Cd in this study. Radish yield significantly increased with up to 45 Mg ha -1 of composted manure application but did not with straw application. In the view point of Cd phytoextractability and plant productivity, it is recommended to apply composted manure rather than straw in Cd contaminated arable soil.

Evaluation of Different Organic Materials in Reducing Cadmium Phytoavailability of Radish Grown in Contaminated Soil