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a-c. Combined and single effect of NP on root length, root diameter, and specific root length (SRL) of first, second and third order root of Acer mono seedling. Interaction values of specific root length (SRL) of second and third order root were non significant. Different letters show the level of significance. Abbreviation N, Nitrogen; P, Phosphorous; NxP, Interaction; RL, root length.
