Based on comparison of data on soil survey in 1979 and investigation of cultivated soil fertility in 2002 of Ningxiang County, Hunan Province, the fertility change of cultivated soils in Ningxiang County and its influencing factors were analyzed. The results indicated that the soil organic matter, total N increased greatly, available P increased by times, steadily available K decreased significantly, the soil acidification became serious. The major influencing factors included the related properties of soil itself and the environmental conditions outside the soil, i.e. no-balanced fertilizatio...
