Agriculture Reference
In-Depth Information
15
loam
12
C
15
30
9
6
3
0
0
20
40
60
80
100
15
clay
12
C
15
30
9
6
3
0
0
20
40
60
80
100
D.A.S.
Figure 6. Values of a bove-ground dry matter / plant observed during the soybean crop cycle on the
loam and clay soils for three water-quality treatments (control C, 15 and 30 meq/l)..
For loam and clay soils, the control treatments and the 15 meq/l treatments show the
same growth in leaf surface and in dry matter before the maximal growth stage. However, it is
possible to observe values significantly lower for the 15 meq /l treatments during the maximal
growth stage.
The salt and texture effects are more evident for the treatments with the highest saline
concentrations:
•
The treatments with the highest saline concentration (treatments irrigated with 30
meq/l) show an increase in leaf surface and in dry matter that is significantly lower
than their respective control groups. This is true for the entire length of the crop
cycle.
•
The highest values for leaf surface and dry matter observed for the treatments with
the highest saline concentration cultivated in the clay soil are 37% lower on average
than those observed for the same treatment cultivated in loam soil.
3.3- Effect on Yield and Water Use Efficiency
Table 5 presents observations regarding productivity, its components and the seasonal
evapotranspiration obtained on the loam and clay soils for all treatments. Also shown on the
table are the data calculated for water use efficiency, treatment by treatment.
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