Abstract
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.
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