WT5,5”BZ>According to detailed data that are gained by 7-year tests of the
different cultivation of the slope land in the
loess
hilly and gully region of the north of Shaanxi province, water use of the different cultivation, water balance, outputs and
comprehensive efficiency of soil and water conservation are discussed. The conclusion is that crop growth is mainly dependent on natural rainfall during the growth period; water consuming content of crop is significantly relative to the rainfall during the growth period per year and water supply content of soil, and crop makes mainly use of soil moisture of 0—120 cm layer. The comprehensive efficiency sequence of the different farmings at the same year is broad terrace>narrow terrace>level trench>traditional tillage>level bench>alternation of slope and terrace, while the soil and water conservation efficiency sequence is terrace>level trench>alternation of slope and terrace>level bench>traditional tillage >bare land. Finally we think that quit cultivating and restoring and rebuilding forest and grass should be quickly put into practice in order to accelerate the eco environmental construction, and strategic adjustment of agricultural structure should be advanced.