Modeling Dominant Height Growth in Planted Pinus pinea Stands in Northwest of Tunisia

Table 4

Distribution of sampled plots in fertility classes and descriptive statistics of site index 𝐼₀ values estimated for the plots of each fertility class.

Fertility classes	Limits of fertility classes	Midvalue of fertility classes	Number of plots	Site index 𝐼0 (m)
				Average	Minimum	Maximum	Standard deviation
1	𝐼0≥13.5 m	15	4	14.22	13.52	14.79	0.648
2	10.5≤𝐼0<13.5	12	27	11.75	10.56	13.41	0.854
3	7.5≤𝐼0<10.5	9	25	9.18	7.79	10.47	0.790
4	𝐼0<7.5	6	6	6.34	5.26	7.39	0.839
Total	—	—	62	10.35	5.26	14.79	2.154