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-transfer function for saturated hydraulic conductivity of lowland paddy soils. Paddy Water Environ. 7. 217–225. Brakensiek, D. L., Rawls, W. J. & Stephenson, G. R., 1984. Modifying SCS Hydrologic Soil Groups and Curve

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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.

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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.

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Pollack Periodica
Authors: Michaela Červeňanská, Adam Janík, and Dana Baroková

] Fatehnia M. , Tawfiq K , Abichou T. Comparison of the methods of hydraulic conductivity estimation from mini disk infiltrometer , Electronic Journal of Geotechnical Engineering , Vol. 19 , 2014 , pp. 1047

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Databases with 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.

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hydraulic conductivity of unsaturated soils . Soil Science Society of America Journal , 44 , 892 – 898 . [6] Tan X. , Wang X. , Khoshnevisan S

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.) Daniel, D. (1989): In situ hydraulic conductivity tests for compacted clay. Journal of Geotechnical Enginering, ASCE , 115 , 1205--1226. In situ hydraulic conductivity tests for compacted clay

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Agrokémia és Talajtan
Authors: Zsófia Bakacsi, Sándor Koós, András Nagymarosy, and Péter László

://www.mta-taki.hu/hu/osztalyok/kornyezetinformatikai-osztaly/agrotopo B ARNA GY. , 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 hydraulic conductivity . In: Proceedings of Peer

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References A imrun , W. , & A min , M. S. M. , 2009 . Pedotransfer function for saturated hydraulic conductivity of lowland paddy soils . Paddy and Water Environment

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