Modelling the Effects of Soil Conditions on Olive Productivity in Mediterranean Hilly Areas

Table 2

Characteristics and fertility levels of the topsoil (0–20 cm) for the selected trees.

Tree number	Visual soil colour	Soil depth (m)
1	Light black	0.30
2	Brown	1.20
3	Light black	0.20
4	Light black	0.20
5	Light black	0.20
6	Light black	0.20
7	Red	0.60
8	Light brown	0.70
9	Brown	0.90
10	Brown-white	0.20
11	Brown-white	0.40
12	White-grey	0.50
13	White-grey	0.30
14	White	1.20
15	White	0.70
16	White	0.80
17	Brown	0.20
18	Brown	0.20
19	Brown-red	0.25
20	Brown-red	0.20
21	Brown-red	0.25
22	Grey	0.15
23	Grey	0.15
24	Grey	0.30
25	Red	0.30
26	Red	0.15
27	Dark brown	0.60
28	Dark brown	0.50
29	Grey	0.20
30	Grey	0.40
31	Grey	0.25
32	Discarded	0.60
33	Light brown	0.90
34	Light brown	0.70
35	Black	1.10
36	Black	1.20
37	Dark brown	1.60
38	Dark brown	1.70
39	Pale brown	0.60
40	Light brown	0.60
41	Red	0.50
42	Red	0.30
43	Red	0.30
44	Discarded	0.60
45	White	0.20
46	Discarded	0.60
47	Grey	0.40
48	Grey	1.00
49	Grey	0.40
50	Brown	0.80
Minimum value		0.15
Maximum value		1.70
Median value		0.40
Mean		0.536
Standard error		0.055