Electric fertilizer, I. E. Exerting electric field on plants during growing season instead of chemical fertilizer, is a kind of physical fertilizer, and the thi
Techniques of gully-specific debris flow hazard assessment developed in four periods since the end of the1980s have been discussed in the present paper. The imp
The characteristics of zonal anomaly and change rule of temporal distribution of annual precipitation in the northeastern China are revealed in this paper with