In the thesis, the technological system of protecting the soil fertilizer in the black soil belt was proposed, the plan was put forward from 6 aspects, such as the soil cultivation, crop planting ways, the water and fertilizer running and so on .

Study on productivity of Medicago sativa with different agronomic measures in black-soil region of mid-tempenate agriculture zone;

Spatial distribution and potential ecological risk of Cd, Pb, As in Jilin black soil;

Effects of added concentrations of Cd and Pb on the distribution of Cd and Pb forms in black soil of northeast China and on the Cd and Pb uptake by cole;

The cause of black soil ecological system frangibility and its rehabilitate;