钾肥对镉污染土壤白菜生长和镉含量的影响

研究了不同种类和不同用量钾肥对镉污染酸性紫色土壤上的白菜生长、产量和镉含量的影响。结果表明,与不施钾肥(CK)相比,施用钾肥后镉污染土壤白菜长势更好,施用K2SO4、KNO3对白菜生长的促进效果最为显著。低量(200 mg/kg)钾肥处理对白菜产量影响不一致,其中以K2SO4最优,增产达36.4%;高量(400 mg/kg)钾肥处理能显著提高白菜产量,增产幅度为2.1%～69.2%,以K2SO4的增产效果最为显著。钾肥处理均能抑制白菜对镉的吸收,显著降低白菜镉含量,降幅为8.6%～36.9%,提高了白菜安全品质。

Effects of Potassium Fertilizer on Growth and Cadmium Content of Cabbage in Cadmium-polluted Soil

A pot experiment was conducted to study the effects of different potassium fertilizers on growth, yield and cadmium content of cabbage in cadmium-polluted acid purple soil. The results showed that, the cabbage grew better in the potassium fertilizer applied treatments compared to the control, and the K2SO4 and KNO3 treatments had the best promoting effects on the growth of cabbage. The yields of cabbage were different in the low potassium treatments （200 mg/kg）, and the K2SO4 treatment had the best effect to increase the yield, with the yield-increasing rate of 36.4%. The cabbage yields increased significantly in the high potassium application treatments （400 mg/kg） by 2.1% to 69.2%, compared to the control, and the K2SO4 treatment possessed the highest yield. All potassium fertilizer applied treatments could significantly decrease the content of cadmium in cabbage by 8.6%-36,9%, and the cabbage was protected from cadmium poisoning by applying potassium fertilizers.