Study on effect of double-cropping system on moisture of dry farmland in the southeast Loess Plateau——A case study of Yangling;

Distribution features of soil water content in the profile of rainfed cropland with long-term fertilization;

Field observation about the influence of ridge tillage on the growth of rape in rainfed cropland;

Ridge tillage is a kind of conservation tillage for water harvesting and drought resistance,which is used widely in the rainfed cropland of the semi-arid sandy areas.

The vegetation supply water index(VSWI),the ratio of normalized difference vegetation index to land surface temperature,is one of the effective methods to assess farmland drought with satellite remote sensing.

The paper, under the background of soil erosion paid extensive attention by the whole world and in light of the actual situation of China,expounds the necessity for soil erosion in the north rainfed farmland.

In order to release the severe water shortage for summer crops, ridge building method is used to harvest water on the dryland field without run off in semi arid areas of South Ningxia.