Nutrition contents in leaves of four walnut varieties in Laershan,Fenghuang

Nutrition contents in leaves of four introduced walnut varieties,which were 'Dapao' and 'Yunxin' from Yunnan,'Qingxiang' from Hebei,and 'Dawan' from Dawan,were analyzed.The results show that the contents of nitrogen,phosphorus and potassium in each variety were in the standard limit,and the variation of some elements were significant among varieties,which could be used as the suggestions for later fertilizer application.