Fig 2. The path analysis diagram for the relationship between REE content in navel orange pulp and soil REE or soil properties.
Single-headed arrows represent the direct effects (P ij), and double-headed arrows indicate the coefficients of the correlations between soil REE and the soil properties (r ij). Subscript designations for soil REE, the soil properties, and the REE content in the navel orange pulp are identified numerically as follows: (1) REE content in soil; (2) soil pH; (3) organic carbon (OC); (4) cation exchange capacity (CEC); (5) clay; (6) Fe oxide (Feox); (7) REE content in the pulp.