Effects of Different Base Application Amounts of Calcium-Magnesium Hydrotalcite in Early Rice on Yield and Rice Quality of Double-Cropping Rice in Southern Hunan
In order to study the effect of calcium-magnesium hydrotalcite on the yield and quality of double-cropping rice,and explore the optimal application rate of calcium-magnesium hydrotalcite in the double-cropping rice area in southern Hunan,using early rice cultivars"Luliangyou 996"(high Cd accumulation cultivar)and"Zhuliangyou 819"(low Cd accumulation cultivar),late rice cultivars"Yuzhenxiang"(high Cd accumulation cultivar)and"Xiangwanxian 13"(low Cd accumulation cultivar)as materials,a field experiment was carried out in Hengyang county,Hunan province.Comparative study of rice yield,yield formation characteristics and rice quality under different dosages of calcium-magnesium hydrotalcite(0,Tl;early rice base application 1500 kg/ha,T2;early rice base application 2250 kg/ha,T3;early rice base application 3000 kg/ha,T4).The results showed that,different dosages of calcium-magnesium hydrotalcite could increase rice tiller number,significantly increased rice leaf area index,relative chlorophyll content(SPAD value)and dry matter accumulation,among which the effects of T3 and T4 treatments were better.Calcium-magnesium hydrotalcite significantly increased the yield of rice,and the yields of all varieties were higher under T3 and T4 treatments.Calcium-magnesium hydrotalcite had no significant effect on rice processing,appearance and cooking quality,but it could significantly reduce the cadmium content of brown rice,and the T4 and T3 treatments had a higher reduction rate.Considering the significant difference in rice yield and rice quality among different application rates and the economy,it was more appropriate to apply calcium-magnesium hydrotalcite 2250 kg/ha in the double-cropping rice fields in southern Hunan.
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