Abstract:

In order to enhance yield and quality of peanut, the problem of low B and high Cd in karst soils should be paid attention to. This paper designed a set of pot experiment composed of two factors and four levels, that is, 0 (blank), 0.25 (low), 0.5 (middle), 1 mg/kg (high) for B and 0 (blank), 1 (low), 5 (middle), 10 mg/kg (high) for Cd respectively, mainly discussed were the effects of adding B on peanut’s biomass, Cd content, oil content and phenolics content under different Cd concentration by analyzing B-Cd interaction effects and action of B to Cd. The results showed: 1.B-Cd interaction effects were mostly stimulation effect on kernel dry weight (low Cd) , Cd concentration, and oil concentration, but mostly inhibition effect on kernel dry weight (middle and high Cd) and phenolics content. 2. B effect on Cd were mostly synergistic action to kernel dry weight (high Cd) , Cd content of inedible part (low and middle Cd) and edible part (low Cd) , but mostly antagonistic to kernel dry weight (low Cd), total fresh weight (high Cd), Cd content of inedible part (high Cd) and edible part (middle and high Cd), oil concentration (low and high Cd) and phenolics content (except for low B and low Cd dealing). 3. The water content of total peanut increased under high Cd concentration. Conclusions are drawn as follows: Under scientific fertilization, planting and tillage, adding 0.25 mg/kg B might enhance peanut productions and quality, reduce the cadmium concentration in kernels; at the same time, we might use peanut as a phytoremediation plant to solve the low B and high Cd problems in karst soils.