Abstract:

In order to improve the quality of formula fertilization by soil testing in Xinfu area, 7582 soil samples from 2006 to 2010 were analyzed to study the soil nutrients condition and affecting factors in this area. The results showed that soil fertility after 2006 was much higher than that at the 2nd National Soil Survey, but the content of available P decreased year by year after 2008, from 23.99 mg/kg in 2008 to 12.53 mg/kg in 2010. The proportions of soils with high content of organic matter, total N, alkali solution N, available K or available P increased obviously, but the proportions of soils with high content of alkali solution N or available K decreased in 2010. The contents of SOM (14.45 g/kg) and available P (17.83 mg/kg) in fluvo-aquic soil were significantly greater than those in Sinnamon soil (14.15 g/kg and 14.88 mg/kg), while the content of available K was in verse. Soil fertility of high altitude locations decreased year by year. Soil nutrients condition was significantly affected by natural factors such as soil type and altitude, which should be take into consideration when fertilizer application was recommended. In conclusion, together with straw returning, more N, P, and K fertilizers should be applied in low-fertility soils, especially in the soil with high altitude.