Agriculture Reference
In-Depth Information
Figure 7 shows exponential relationships between water intake rate and elapsed
time under different irrigation systems (DIS, LHBIS and GPIS) during 2002/2003 and
2003/2004. It can be concluded that water IR into the soil in the ascending order was
GPIS<LHBIS<DIS during 2002/2003. This may be attributed to rapid soil wetting
under GPIS and LHBIS relative to DIS. It will deteriorate soil aggregates and subse-
quently water IR into the soil. The results were similar to those of Kemper et al. [47].
At the end of season 2003/2004, the difference in water intake rate into the soil among
irrigation systems disappeared. This may be due the offsetting effect of salt accumula-
tion on aggregate disintegration.
FIGURE 7
The relationship between water intake rate and elapsed time for three irrigation
systems.
20.3.1.2 SOIL SALINITY
Salts distribution patterns for each irrigation system are plotted in Figs. 8 and 9. Re-
gardless of the irrigation systems used, salt concentration before irrigation exceeded
than the one after irrigation.
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