Agriculture Reference
In-Depth Information
3.-Effect of the Soil Texture on Plant Water Relationships and Productivity
of the Treatments Irrigated With Saline Waters
3-1- Effect on the Plant Water Relationship
Figure 2 shows the values of pre-dawn leaf-water potential observed in the loam and clay
soils for the control treatments (irrigated with fresh water) and saline treatments (irrigated
with waters having 15 and 30 meq Cl/l).
D.A.S.
10
30
50
70
0.0
loam
C
15
30
-0.2
-0.4
-0.6
-0.8
-1.0
-1.2
D.A.S.
10
30
50
70
0.0
clay
C
15
30
-0.2
-0.4
-0.6
-0.8
-1.0
-1.2
Figure 2. Pre-dawn leaf-water potential observed during the soybean crop cycle on the loam and clay
soils for the three water-quality treatments (control, C, 15 and 30 meq/l). Irrigation timing is indicated
by the arrows.
The variations in pre-dawn leaf-water potential observed in saline treatments are the same
as those observed in control treatments. However, the observed values differed significantly
for the three water qualities. In loam and clay soils, the 15 meq/l treatments had an
intermediate position between the control and the 30 meq Cl/l treatments. The largest
difference between the three treatments was always observed just before irrigation. Soil
texture did not significantly affect the pre-dawn leaf-water potential.
Figures 3 and 4 show the hourly values of leaf-water potential and stomatal conductance
for the six treatments during the daytime on day 64 D.A.S., just after irrigation at a high
predawn-leaf-water potential and day 76 D.A.S. at a lower predawn leaf-water potential.
Search WWH ::
Custom Search