Growth, yield and cadimi accumulation in rice under condition of contaminated irrigation water

Abstract

    In this study, contaminated paddy soil with Cd concentration of 5.125 ppm was used for the experiment, biochar from rice husk (BRH) and rice straw (RS) were mixed into the soil for the purpose of changing soil properties (increasing pH and Si content) to limit Cd accumulation in grain. The experiment was carried out under the net house conditions, the experimental results showed that the control ability of Cd accumulation in grains in the order RS 2.5% < BRH 1.25% + RS 1.25% < BRH 2.5% < formulas (BRH 5%, BS 5%, BRH - BS 2.5%-2.5%). Formulations of BRH and RS with 5% have the best results. Formulas of BRH 5%, BS 5% and BRH - BS 2.5%-2.5%, there was no significant difference of Cd
content in grain. However, the grain Cd of the BRH 5%, BS 5%, BRH - BS 2.5%-2.5% treatments decreased significantly compared with the control from 82.47 - 83.94%. Therefore, applying ratio of 2.5% of BRH and 2.5% RS in BRH - BS 2.5%-2.5% or 5% BRH or 5% RS (w:w) provides good results about the control ability of Cd accumulation in grains