To investigate the effect of low amount of potassium application with magnesium hydroxide nanoparticles on the nutritional effect of cabbage and to improve the efficiency of potassium utilization. A pot experiment of cabbage was conducted at Southwest University using acidic purple soil. All treatments were applied with N 200 mg/kg and P_2O_5 100 mg/kg, and five treatments were applied: no potassium, low potassium (K_2O 75 mg/kg soil), moderate potassium (K_2O 105 mg/kg soil), and low potassium with MgOH nanoparticles 1.13 and 1.88 mg/kg soil. The yield, chlorophyll content, antioxidant capacity, nutrient uptake, potassium utilization efficiency and nutritional quality of cabbage were measured after 68 days of growth.
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The yield of cabbage was increased by 21.5% when 0.3% (1.13 mg/kg soil) of total nitrogen, phosphorus and potassium fertilizer was applied. 8.9% and 4.3%~8.7%, respectively. The antioxidant capacity of cabbage was increased by 7.6%, 6.2% and 6.8%~20.0% for non-enzymatic antioxidants such as carotenoids, total phenols and flavonoids, respectively, and by 9.8%~18.8%, 10.7%~11.2% and 7.4%~9.9% for enzymatic antioxidants such as superoxide dismutase (SOD), peroxidase (POD) and catalase (CAT), respectively. and 7.4%~9.9%, respectively. The nutrient uptake of cabbage was promoted by the application of magnesium hydroxide nanoparticles, which increased the phosphorus and magnesium contents of cabbage by 3.8%~16.9%, 11.1%~24.9%, and the uptake of nitrogen, phosphorus, potassium and magnesium by 9.1%~10.2%, 13.2%~32.3%, 8.4%~14.4% and 26.6%~39.7%, respectively. efficiency and potassium utilization.