Abstract:

In order to explore the role of potassium fertilizer in safe vegetable production under lead pollution soils condition, a pot experiment was conducted to study the effects of different potassium fertilizers (potassium sulphate and potassium chloride) on cabbage yield, nutritional quality and safety quality (nitrate and heavy metals) in lead pollution soils. Results indicated that the yield and roots weight of cabbage were significantly increased by the fertilized treatments by 9.5%-48.4% compared to the CK1. Application of potassium fertilizer could significantly reduce amino acid and Vc content in cabbage, but increase the content of the reducing sugar in it. The nitrate content of cabbage was increased in lead contaminated soil and reduced by 15.3%-54.6% in potassium fertilizer treatments. Potassium sulphate could significantly reduce the lead content of cabbage. Lead content of cabbage was increased by the low dosage of potassium chloride and the others significantly decreased in low lead contaminated soil.