Table 2 Estimation of adequate values for foliar nutrient concentration by age in teak (Tectona grandis L.f.) plantations in Costa Rica and Panama based on the models proposed in Fernández-Moya et al. (2013). Macronutrient concentrations (N, Ca, K, Mg, P and S) are expressed as percentages, while micronutrient concentrations (Fe, Mn, Cu, Zn and B) are expressed in mg kg^-1. Confidence intervals (α = 0.05) are reported in parentheses.

5 years

10 years

19 years

N

2.13 (1.97, 2.33)

1.97 (1.83, 2.15)

1.76 (1.64, 1.91)

Ca

1.34 (1.13, 1.54)*

K

0.88 (0.73, 1.02)*

Mg

0.26 (0.18, 0.31)

0.29 (0.22, 0.34)

0.34 (0.27, 0.39)

P

0.16 (0.12, 0.20)*

S

0.12 (0.11, 0.13)*

Fe

129.61 (84.63, 174.59)*

Mn

42.55 (39.03, 46.07)*

Cu

11.08 (10.22, 11.93)*

Zn

32.00 (24.74, 39.26)*

B

19.62 (18.32, 20.91)*