Effects of N、P、K on Apple Anthracnose Leaf Blight

In order to clarify effects of different concentrations of N，P，K on proliferation efficiency of apple anthracnose leaf blight fungus，various concentrations of NaNO3，NaH2PO4 and KCl were used to treat apple bacillus anthracis.The bacterial colony size and growth were observed.Results showed that，the N，P and K elements provided by different concentrations of the agents had both inhibitory and promoting effects on the pathogen.①5 g/L treatment of N elements had the best inhibitory effect on leaf blight of apple anthrax，and inhibitory rate was 29.49%.② Among the P elements，concentration of 1 g/L had the best inhibitory effect on leaf blight of apple anthrax（2.56%）.③37 g/L K element treatment had a certain inhibitory effect on bacteria，and inhibition rate was 5.13%.④ 5 g/L K element treatment had the highest promoting effect on pathogen.⑤ N of 5 g/L+P of 1 g/L and N of 5 g/L+ K of 37 g/L had better effect on constraining bacterial growth.Overall data showed that，effects of different concentrations of three elements on bacillus anthracis were significantly different.Overall inhibitory effect of N was significantly greater than that of P and K.The group of N+P or N+K were better way to restrain bacterial growth.