|
AGRICULTURAE
CONSPECTUS SCIENTIFICUS
Volume 63, Supplement No 4, 1998 (353-360)
ORIGINAL
SCIENTIFIC PAPER
Functionality
of Pipe Drainage at the Trial Field Oborovo in the Sava River Valley
D. PETOŠIĆ 1
D. DOLANJSKI 1
S. HUSNJAK 2
SUMMARY
The investigation
goal was to point the efficiency of pipe drainage set up on vertic amphigley
of the trial field Oborovo. To obtain the relevant indicators, detailed
hydropedological investigations were carried out at the trial field Oborovo
during 1991 and 1992. Dynamics of effective soil moisture in the rhizosphere
layer, fluctuations of groundwater level, and frequency and intensity
of drainage discharge were continually followed in the long-term period
from 1991 to 1995.
Only one systemic soil unit was determined at the trial field : amphigley,
mineral, vertic, hydroameliorated.
During five-year investigations of moisture in the rhizosphere soil layer
for maize in its growing period (May - October), dominance of the wet
soil phase was determined. The wet soil phase prevailed outside the growing
period while no dry was recorded.
Measured from the mean absolute ground elevation (98,63 m a.s.l.), groundwater
levels fluctuated from 98,03 m a.s.l. to 96,21 m a.s.l., and 0,60 m to
2,42 m below the soil surface.
Drainage discharge was recorded in 26 of the 54 months of the investigation
period. The mean drainage discharge intensity was 0,259 l/s/ha, whereby
discharge values ranged from the minimum 0,010 l/s/ha to the maximum 0,760
l/s/ha.
Occurrence of drainage discharge was confirmed in 100 % cases, when the
groundwater level reached 97,70 m a.s.l., or 0,80 m below the mean ground
level.
On average, no drainage discharge was recorded for 15 of 27 drain pipes
monitored, which indicates a 44 % system functionality.
The results confirm the fact that drainage of veric amphigley-epigley
soils used for conventional agricultural production in the Central Sava
River Valley basin cannot be efficiently solved by the traditional system
of pipe drainage.
KEY WORDS
Pipe
drainage, functionality, groundwater level, drainage discharge, soil,
excess
1
Department of Soil Amelioration
2 Soil Science Department
Faculty of Agriculture University of Zagreb
Svetošimunska cesta 25, 10000 Zagreb, Croatia
Received: November 12, 1998
|
