This paper study the changed characteristics of cultivated soil quality in space and time of Liling county, based for the management of the soil nutrition in precision agriculture. The main results included that the available nitrogen nugget was largest; The substrate effect of the pH, available nitrogen, soil available phosphorus and available potassium was from 25%to 75%; the soil pH decreased, while the available nitrogen, soil available phosphorus and available potassium improved, where the speed of the pH and the soil available phosphorus was fast; according to the research of temporal va...