Changes in the soil fertility down the profile of Haplic Chernozems as a result from 50-years mineral fertilization

摘要

The systematic introduction of macro elements at different norms and ratios during a 50 years period of cultivation of Haplic Chernozems leads to formation of different levels of soil acid complex indices,available N forms of total N and C at depth up to 100 cm with well expressed differentiation.The long-term two-field agricultural use of the trial field without mineral fertilization was characterized with lowest soil fertility potential.According to the 40th year of investigation total N concentration at the end of 50th year increased with 17.24%.