Original scientific paper
THE YIELD AND LAND RECLAMATION PROBLEMS OF AGRICULTURAL LAND OF ŠEMOVEC AREA
Željko Vidaček
Frane Tomić
Abstract
The detailed soil survey, land reclamation and crop production
investigations are made for 706 hectars of Šemovec area.
Investigated area belongs to the rather flat river Drava alluvial
valley. The soils are semigley and hypogley with maximum height
of groundwater talble for semigley soils 1—2 meters and for hypogley
less than 1 meter. Changes in groundwater levels including
water table are caused by changes in groundwater storage of unconfined phreatic aquifer and due to reduced natural water regime
of river Drava and water regime of river Plitvica channel.
The texture of semigley and hypogley topsoil is mostly silty loam
while unconfined aquifer is mixture of gravel and sand (graf. 1).
Effective soil depth vary from shallow (20—60 cm) to deep (more
than 100 cm). Average content of available soil water is 150 mm/m
(graf. 4) while infiltration rate of surface layers is very high. The
primary source of water of semigley topsoil is rainfall. In general
the rainfall in this humid area vary widely m respect to amount
and frequency (graf. 2, 3). The present crop production is mostly
extensive due to crop rotation and yields.
The present land suitability for intensive crop production is
evaluated in respect to suitable (S-1, S-2, S-3) and unsuitable (N-1,
N-2) land classes. Limitations for intensive crop production are
mostly due to some combinations of fertility status, effective soil
depth and unregulated soil water regime.
There are two land reclamation units. One priority for agroamelioration of 642 hectars (semigley) and another one of priority for agro and hydroamelioration of 58 hectara (hypogley).
Land reclamation must be done in order to some combinations
of soil loosening, soil fertilization (450 kg PgOg and KgO), supplementary irrigation (due to maximum monthly deficit of available soil water approximately 78 mm including net hydromodul 0,29—0,311/sec/ha), introduction of new crop rotations and soil drainage.
Keywords
Hrčak ID:
133926
URI
Publication date:
5.12.1986.
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