Based on the method of incubation test and controlling the pH of typical black soil samples

the relationship of soil pH and the effective content of trace elements of Cu

Zn and Mn was studied. The results show that following pH changing 0.5 units

the ratio of high value to the low value of the effective Cu content is about 0.5~1 times in typical black soil

the ratio of effective Mn content is about 3~5 times and the ratio of effective Zn content is about 9~15 times. These indicate that it is great importance of theory and practice for soil diagnosis

proper fertilization of trace elements fertilizer

increasing grain output and realizing sustainable utilization of land that pH value of soil is mastered accurately.