-transfer function for saturated hydraulicconductivity of lowland paddy soils. Paddy Water Environ.
Brakensiek, D. L., Rawls, W. J. & Stephenson, G. R.,
1984. Modifying SCS Hydrologic Soil Groups and Curve
The aim of the study was to determine K-factors of homogeneous zones in
palm-groves in order to make possible the interpolation of these values to
other similar areas, and by this way to help the calculation of draining
parameters. Another goal was to interpret the agronomical aspects of the
results. Investigations for the determination of conductivity factors
(K-factors) were carried out in the palm-groves of the Oued Rhir Valley. The
measurements - conducted three times -
were made by the auger-hole method. After boring the hole, a perforated
cylinder was placed into it to prevent falling in. K-factor values were
calculated after van Beers. The mean of the three calculations was given as the
end result for the K-factors. Our results show that K-factor values are
influenced by the porosity, type, bulk density and texture of soils, their salt
content and the form of gypsum. The K-factor was extremely high in case of
sandy soils and soils containing crystallized gypsum. Water conductivity was
moderate in case gley and pseudogley were located in deeper layers. The lowest
values occurred when gypsum was found in cemented coherent particles.
Salinization in deeper layers influenced hydraulic conductivity only in case it
was associated with finer texture and airless layers. Besides date production, the traditional growing of
nitrogen-fixing perennial legumes (alfalfa, Egyptian clover, melilot, etc.) in
palm-groves is essential. Systemic
flooding irrigation decreases the salt content of soils, increases date and
legumes yields. Legumes - by their root-system - improve the nitrogen balance,
structure and water drainage of soils. The green parts of the cultivated
legumes serve as fodder for animals (goats, sheep, cows), which turn it to
manure. This manure increases the nutrient supply of the soils for palm-trees
and vegetables. The positive results of stubble and root manuring (green
manuring) of legumes is also confirmed by experiments on sandy soils. The
elaboration of a good plant rotation is possible. At last, date and vegetables
produced in this way could be sold better on the world market as bioproducts.
Authors:Brigitta Tóth, A. Makó, K. Rajkai, G. Sz. Kele, T. Hermann, and P. Marth
According to the Hungarian Soil Information and
Monitoring System's (HSIMS) database a group estimation method was developed to
predict the mean soil hydrophysical properties. The estimation efficiency of
the worked out prediction procedures was controlled on a test database, and on
a dataset of a study area. It can be established that the water retention and
the hydraulic conductivity of soils are sufficiently predictable from the
category data of soil maps. The 10-digit map codes of the PWW mapping method were
created by different estimation methods, and as a result the PWW map was drawn.
However, it is not always possible to estimate the necessary soil hydrophysical
properties from the available map information for preparing the PWW map.
Sometimes the knowledge gained from the field reports is needed as well.
Further studies are planned for integrating these morphological information
into our estimations.
Authors:Michaela Červeňanská, Adam Janík, and Dana Baroková
, Tawfiq K , Abichou T.
Comparison of the methods of hydraulicconductivity estimation from mini disk infiltrometer , Electronic Journal of Geotechnical Engineering , Vol. 19 , 2014 , pp. 1047
information on soils often constitute a basic source of information for studies
in production agriculture, environmental engineering, and remote sensing. A
new, searchable, relational database of soil physical and hydrophysical
properties has been developed for Hungarian soils. The database is stored in
MS-Access format. The database is compatible with most of the popular software
and can be run on a personal computer as well as on computer networks. It
currently stores data of 840 soil horizons, 576 having soil hydraulic data,
measured using nationally and internationally accepted standard methodology. An
outline of the structure and the contents of HUNSODA, as well as a basic guide
to its operation has been given. Developing this database may enhance the
ability of Hungarian soil scientists to address many more environmental issues
of concern, however, further expansion of the database is recommended.
Additional data can easily be included in the database. Expansion of the
database may help in making it more widely applicable.
Authors:Zsófia Bakacsi, Sándor Koós, András Nagymarosy, and Péter László
, S ZABÓ J. , B AKACSI ZS. , K OÓS S. , L ÁSZLÓ P. , H AUK G. , R AJKAI K. & M AKÓ A. , 2015 . Effect of particle size limit values on predicted soil hydraulicconductivity . In: Proceedings of Peer