Based on longterm experiment,this paper mainly researches the effect of longterm continuous winter wheat and nitrogen fertilizer on the distribution of nutrients of soil profiles.The experiment results show that the profile of organic matter,total nitrogen and available nitrogen is taken on the Sshaped distribution,but total phosphorus is the parabolic form in soil profiles.The nutrients difference of the layers below topsoil is biggest under different treatments,even though the nutrients difference of ...
修改评论