A field microplot experiment was conducted in the red soil hilly region of South China to evaluate plant phosphorus (P) uptake under soybean and citrus monoculture and the soybean-citrus intercropping system using the 32p tracer technique.P fertilizer was applied at three depths (15,35,and 55 cm).The experimental results showed that the planting pattern and 32p application depth significantly affected the characteristics of P uptake by soybean and citrus.Under the soybean-citrus intercropping system,considerable competition was observed when the 32p fertilizer was applied to the topsoil (15 cm...
