Agriculture Reference
In-Depth Information
within the
DAW
range). The effective rooting depth is 0.6 m. The soil is a clay
loam with
RAW
80 mm/m depth and
DAW
50 mm/m depth (48 and 30
mm, respectively, for the effective rooting depth).
Drainage
(
Crop
) or
E
a
Stage of
Rain,
P
E
p
Coeff.,
E
a
P
SWD
Irrigation
Growth
Week No.
(mm/week)
(mm/week)
C
c
(mm/week)
(mm/week)
(mm/0.6 m)
(
) (mm)
Bud burst
1
10
20
0.2
4
6
0
6
(1 Oct.)
2
0
22
0.2
4.4
4.4
4.4
0
3
0
25
0.2
5
5
9.4
0
4
2
30
0.2
6
4
13.4
0
5
0
32
0.2
6.4
6.4
19.8
0
6
4
30
0.4
12
8
27.8
0
7
10
35
0.4
14
4
31.8
0
8
0
36
0.4
14.4
14.4
46.2
0
Irrigate to return
SWD
to 0; volume required
46 mm, or 46 L/m
2
,
adjusted according to application method (see appendix 10)
0
46
Flowering
9
4
38
0.4
15.2
11.2
11.2
0
10
12
38
0.4
15.2
3.2
14.4
0
11
5
40
0.4
16
11
25.4
0
Fruit set
12
0
42
0.3
12.6
12.6
38
0
13
0
46
0.3
13.8
13.8
51.8
0
14
0
49
0.3
14.7
14.7
66.5
0
15
12
40
0.3
12
0
66.5
0
Veraison
16
0
49
0.3
14.7
14.7
81.2
0
(February)
Irrigate to return
SWD
to
48 mm; volume required
33 mm or 33 L/m
2
(adjusted as done previously)
48.2
33
The Relationship Between
EC
1:5
and
EC
e
for a Range
of Soil Textural Classes
Appendix 12
To convert
EC
1:5
values to
EC
e
values, multiply the
EC
1:5
value by the factor in
table A12.1. The factor decreases as texture increases because, per unit weight of
soil, a clay holds more water at saturation than a sand: the dilution effect on the
soil solution is therefore relatively smaller in the clay soil.
Table A12.1
Conversion Factors for
EC
1:5
Values
According to Soil Texture
EC
1:5
Factor
Soil Texture Class
EC
e
Loamy sand
13
Loam
11
Sandy clay loam
8.5
Light clay
6.5
Heavy clay
5
