Effects of Calcium-Magnesium Hydrotalcite on Cadmium Content in Brown Rice of Double-Cropping Rice and Soil Characteristics
In order to explore the effect of calcium-magnesium hydrotalcite(CMH)on cadmium content of brown rice in double-cropping rice and its suitable application methods,a two-year field experiment was conducted under different application methods of CMH(CK,0;T1,basal application of 3000 kg/ha in early rice in first year;T2,basal application of 1500 kg/ha in early rice in first year;T3,basal application of 1500 kg/ha in early rice per year;T4,basal application of 750 kg/ha per season;T5,basal application of 375 kg/ha per season).The results showed that CMH could significantly reduce the cadmium content in brown rice of double cropping rice,but the decrease varied between varieties and years.The decrease in cadmium content of brown rice in various varieties in 2021 increased with the increment of CMH dosage,but there was no significant difference among T1,T2,and T3 treatments.The decrease in cadmium content in brown rice in 2022 was the largest in T3 treatment.CMH significantly increased soil pH and nutrients content,and reduced soil available cadmium content,and T1 and T3 treatments were the best in 2021 and 2022,respectively.Principle component analysis and correlation analysis showed that the amount of CMH was significantly negatively correlated with the available cadmium content in soil and the cadmium content in brown rice,while it was significantly positively correlated with soil pH,available phosphorus,available potassium,and alkaline nitrogen content.It can be seen that reasonable application of CMH can improve soil acidity,increase soil nutrient content,reduce effective cadmium content in soil,and ultimately reduce cadmium content in brown rice.In summary,T3 was the optimal treatment under the experimental conditions.
RiceCalcium-magnesium hydrotalciteApplication methodYieldCadmium content in brown riceSoil characteristics
万方数据
维普
