Yang, L., College of Recourses and Environmental Science, Shenyang Agricultural University, Shenyang, Liaoning, China
Li, T., Key Laboratory of Horticulture in Liaoning, Shenyang Agricultural University, Shenyang, Liaoning, China
Li, F., Agricultural College, Guangxi University, Nanning, Guangxi 530005, China
Lemcoff, J.H., Institute of Soil,Water, and Environmental Sciences, Volcani Center, Bet Dagan, Israel

Knowledge of phosphorus (P) behavior in long-term fertilized soils is essential for better fertilization practices and protection of environmental quality. Therefore, we evaluated the various forms of P contents, fraction, and distribution of soil inorganic P in a greenhouse under continuous fertilization since 1988. Continuous fertilization increased total and available P contents at the 0- to 20-cm soil layer. Applied organic manure and chemical fertilizer increased the contents of total, available, organic, and inorganic P (Pi) significantly. In the soil fertilized with organic manure, the greatest fraction of the Pi was occluded P (O-P), whereas in the soil not fertilized with organic manure, the greatest fraction of the Pi was calcium-bound P (Ca-P). All fractions of the Pi in both soils treated with organic manure and inorganic manure decreased gradually with soil depth. Thus, the long-term fertilization of organic fertilizer increases the accumulation of various soil P forms and causes deeper Pi translocation. © Taylor & Francis Group, LLC.