Effects of Applying Selenium Endogenous Regulators on the Absorption of Selenium,Cadmium,and Arsenic by Rice
A pot experiment was conducted by adding multiple composite regulators to selenium-rich soil,in order to clarify the effects of different endogenous selenium regulators on the absorption of selenium(Se),cadmium(Cd),arsenic(As)by rice and the forms of Se,Cd,and As in soil.The results showed that,the application of 1%or 2%montmorillonite composite conditioner(MT)could achieve the effects of increasing selenium and reducing cadmium in rice,with a 2%addition rate having the best effect.Under the condition of high selenium soil(soil Se content of 1.99 mg/kg),applying calcium magnesium phosphate fertilizer+phosphate rock powder+active silicon(GLG)could achieve dual effects of excessive Se reduction and simultaneous As reduction in rice.Under the condition of medium selenium soil(soil Se content of 0.83 mg/kg),adding calcium magnesium phosphate fertilizer+bone powder+active silicon(GGG)had the best effect on increasing selenium and reducing arsenic in rice.However,under the condition of low selenium soil(soil Se content of 0.46-0.47 mg/kg),adding calcium magnesium phosphate fertilizer+biochar+organic bacterial fertilizer+activated silicon(GTJG)and calcium magnesium phosphate fertilizer+lime+activated silicon had better effect.
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