Fig 1.
Height and root-collar diameter (RCD) in Buddhist pine (Podocarpus macrophyllus [Thunb.] D. Don) seedlings exposed to exponential fertilization (EF) treatments.
EF was applied at eight rates: 0 (control), 20 (E20), 40 (E40), 60 (E60), 80 (E80), 100 (E100), 120 (E120), and 140 (E140) mg N seedling-1. Values are mean ± Standard error. Different lower-case letters indicate significant differences between fertilization treatments for plant height; Latin-letters indicate significant differences between fertilization treatments for RCD.
Table 1.
Root morphology in Podocarpus macrophyllus seedlings cultured by exponential fertilization at rates of 0 (Control), 20 (E20), 40 (E40), 60 (E60), 80 (E80), 100 (E100), 120 (E120), and 140 (E140) mg N unit-1.
Fig 2.
Biomass, nitrogen (N) content and concentration, and phosphorus (P) content and concentration in Buddhist pine (Podocarpus macrophyllus [Thunb.] D. Don) seedlings exposed to exponential fertilization (EF) treatments.
EF was applied at eight rates: 0 (control), 20 (E20), 40 (E40), 60 (E60), 80 (E80), 100 (E100), 120 (E120), and 140 (E140) mg N seedling-1. Different letters present significant differences according to Tukey’s test at the 0.05 level. Values are mean ± Standard error. Different lower-case letters indicate significant differences between fertilization treatments for plant biomass and nutrient content; Latin-letters indicate significant differences between fertilization treatments for nutrient concentration.
Fig 3.
Vector analysis of the relative N and P statuses in Buddhist pine (Podocarpus macrophyllus [Thunb.] D. Don) seedlings exposed to exponential fertilization (EF) treatments.
EF was applied at eight rates: 0 (control), 60 (E60), 120 (E120), and 140 (E140) mg N seedling-1. Vector shifts indicate the relative nutrient status as given by Salifu and Timmer (2003). Shift C, nutrient deficiency; Shift D, luxury nutrient consumption; Shift E & F, excessive nutrient toxicity; Shift G, excessive nutrient depletion.
Table 2.
Leaf green color index (GCI), leaf area (LA), and root to shoot ratio (R/S) in Podocarpus macrophyllus seedlings cultured by exponential fertilization at rates of 0 (Control), 20 (E20), 40 (E40), 60 (E60), 80 (E80), 100 (E100), 120 (E120), and 140 (E140) mg N unit-1.
Table 3.
Relationship between morphological traits and biomass, N and P concentrations, and N and P contents in Podocarpus macrophyllus seedlings.