Andrei Canarache, Research Institute for Soil Science and Agrochemistry, Bd. Marasti 61, Bucharest 011464, Romania
Recent developments in Romania referring to evidence, processing and use of soil and landscape data for estimation of not available soil characteristics, limitation factors, land rating, existing and possible risk for degradation processes, and specific soil management practices are presented. Existing information on soils in this country consists in published and digitized small and medium scale maps for the whole country, including mainly data on soil taxa and topsoil texture. Large scale maps (1:10,000) are available for most of the agricultural area, accompanied by a large set of soil and landscape characteristics, but these maps are not published and not digitized. A data base of representative soil profiles is available, including some 6,000 profiles with a large a set of physical and chemical properties. For practical use of this information at country level, in a first stage now completed, the soil map at the 1:500,000 scale was used. Some 5,000 contours are separated on this map, and the data base of attributes described in this paper refers to these land units. An extension to the soil map at the 1:200,000 scale is now in progress. The steps which were followed were: (1) The soils map was overlayed on existing maps of climate, relief, administrative divisions of the territory, a.o., this way being possible to obtain a set of complementary data of direct interest for the scope of this work. (2) A series of data which could be directly estimated from soil taxa and topsoil texture and from overlaying of the soil and other maps mentioned above were obtained using an expert-type procedure. E.g., soil salinity, waterlogging, erosion degree, etc. (3) Pedotransfer rules were developed, using as input data the information obtained in the preceding steps and data available from the soil profile data base, these pedotransfer rules allowing estimation at class level of data on texture of the control section, compactness, water retention curve, moisture characteristics, reaction, humus content, soil erodibility, rain erosivity, and other data needed for further identification of attributes of direct practical use. (4) Evaluation of land capability for different agricultural uses, land suitability for different crops, as well as land rating according to the existing methodology in use in this country which takes into account 17 soil and landscape characteristics and calculates rating marks specific for various land uses and crops, was the next step. (5) pedotransfer rules were also developed for estimation of atributes directly related to management practices, as trafficability, workability, soil tillage and soil fertilization systems, irrigation water application, recommended for different areas. (6) another set of pedotransfer rules were developed for estimation of limitation factors and existing degradation processes as erosion, waterlogging, aridity, drought, salinisation, compactness, etc., as well as for evaluation of possible risks of future extension of these degradation processes under various land management systems. (7) requirements and capability for land improvement and land conservation, as drainage, irrigation, erosion control, liming, gypsing, salt leaching, deep loosening, a.o., were estimated using another set of pedotransfer rules. Completion, and further development of this methodology at a larger scale, is trying to emphasize on use in practice of current information on soils in the present-day stage of comoputer data processing. Some of the procedures used here, especially some of the pedotransfer rules, could, hopefully, be of interest for other countries too.
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