| The experiment was carried out on fertilization and soil fertility of Loessial soil of new ly-built ter-race in semiarid mountain areas in Gansu Provice. The results showed that cooperative application of organic fertilizer，nitrogen， phosphorus and potassium w as an important agronomic measure to increase soil fertility and
crops’yield of new ly built terrace. It could increase the crop yield by 21.4%~41.6%，the economical net in-
come by 283. 0~2557.2 yuan/ hm2, and the absorption of N，P2O5 and K2O above ground by 52.8%~70.1%, 115.0%~116.7% and 16.8%~92.7%, respectively. The utilty of soil water w as enhanced by 32.5%~37.1%, the topsoil available nutrients content were greatly improved. |