| Pointed at the problems of serious soil nutrients losses and low corps yield in slope farmland in the Southern Mountain Region of Ningxia, different degree of soil erosion was simulated by removing topsoil of 0 cm, 10 cm, and 20 cm, the purpose was to investigate the effect of four fertilization methods of single application of chemical fertilizers (NP), combined application of organic-inorganic fertilizers (M+NP), single application of organic manure (M), and no fertilizers (CK) on spring maize yield, soil organic matter, and soil available N, P, K contents in erosion of slope farmland, thereby proposed the fertilization model for improving crop yield and soil fertility in the erosion of slope farmland. The results indicated that: Relative to the treatment CK, the ear length, row numbers per ear, grain numbers per ear, and 100 grain weight of spring maize were total increased by the treatments M and M+NP for different erosion degree of slope farmland, and achieved the purpose of increasing crop yield. Both yield and yield components of spring maize were significantly decreased with the degree of soil erosion continuing to worsen in slope farmland. Relative to removing topsoil of 0 cm, the yields of spring maize were significantly decreased by 26.4% and 38.5%, respectively for the treatment removing topsoil of 10 cm and 20 cm. Under the same degree of soil erosion conditions, the fertilization measures could significantly increase soil available N, P, K contents in 0～20 cm, but there was no significant effect on soil organic matter content. However, the average contents of soil organic matter and soil available N, P, K nutrients were assumed decreasing trend with the degree of soil erosion continuing to worsen in slope farmland. After application of organic manure or combined application of organic-inorganic fertilizers, the proportion of sandy in soil was decreased, and clay content in soil was increased. So the soil physical structure can be effectively improved. |