Cadmium And Nitrate Accumulation In Different Genotype Cabbages And Their Control

Cadmium contents in the edible parts of 30 cultivars of Chinese cabbage were studied in a Cd-contaminated soil.Significant differences of edible parts Cd contents and nitrate contents were found among the cultivars.Biomass of different Chinese cabbages are significal different.Dry weights in Gaohua and Zhebai cabbages are significal higher than others(P＜0.05).Cd contents in edible parts of Chinese cabbage range between 60.3 mg·kg^-1and 12.1 mg·kg^-1.Cd contents in edible parts of Youdonger and Gaohua cabbages are 55.3 mg·kg^-1DW and 60.3 mg·kg^-1DW respectively,and significal higher than others.In Jingfeng 1,Cd content is 12.1 mg·kg^-1,significal lower than others.Nitrates in edible parts of Chinese cabbage range from the highest cultivar's 10539.9 mg·kg^-1to the lowest cultivar's 249.9 mg.kg^-1.Pot experiment were carried out to study the effects of different levels of nitrogen(urea)on Chinese cabbage for Cadmium uptake,nitrate accumulation and the quality of nutrition.Experiments show that application of urea in various cadmium pollution levels can be a significant reduction in the accumulation of cadmium in the Chinese cabbage,but too much urea leads to the exceeding of nitrate. The study of nutritional quality indicator of cabbage shows that the quantity of urea has no significant effect on the soluble sugar.And little effect on the amino acid content.The experiment shows that in the low cadmium pollution area,under 300 kg·hm² urea level,suitably increase the nitrogenous fertilizer(urea)can reduce the absorption of cadmium by Chinese cabbage.At the same time,the experiment also shows that by reducing soil water-soluble and available cadmium the nitrogenous fertilizer reduce the uptake of cadmium in cabbage.