With the analysis on the water shortage situation in Shanxi Loess Plateau, this paper puts forward a mechanized technology system for highly efficient use of rainfall in dry farmland of Shanxi Loess Plateau which integrates the essential technologies of stalk mulching, deep loosing and furrow drilling along the two sides of film with the development of new pattern and key farm implements.

In accordance with the character of poor nitrogen and phosphorus in soils in semiarid cold region with high elevation in northwest Hebei, the experiments of soil fertility improvement with organic and mineral fertilizers were conducted on meadow chestnut soil in drought shoaly land from 1992 to 1994.

According to the statistical analysis of long-term natural rainfall data from 1961 to 1999,combining field location and micro-area experiment,the four indexes for drought disaster evaluation were put forward based on the analysis of soil water content balance,namely water deficiency index,withering index,rainfall index,and drought index.

The effects of sowing date on maize hybrids under natural precipitation were investigated.