Effect of selenium applications on the selenium accumulation and yield on several kinds of vegetables

The experiment was carried out by spraying selenium(Na2SeO3) of difference quality concentration on the leaves of broccoli,carrot and garlic with in which five treatments with three ranges of quality concentration of 0.1-100 mg/L,0.5-500 mg/L and 0.5-1 000 mg/L,respectively,were designed for every vegetable.The contents of total Se,organic Se and inorganic and yields of vegetable were analyzed after harvest.The results showed that blade application selenium can increase the content of total Se,organic Se and inorganic Se of tested vegetable.With the increasement of application rate of Se,the transformation rate of organic Se went up.The highest accumulation of organic Se was broccoli,which was 135.7 times of the control group,among three vegetable with 100 mg/L of Na2SeO3.Se application decreased the kinds of vegetables yield compared with control group except Se concentration ≤10 mg/L on garlic and 0.1 mg/L on broccoli.Comprehensive analysis of the effects of Se application on the selenium accumulation and yield indicated that the appropriate application concentration of Se should not be more than 0.5 mg/L.