G. Tóth, A. Makó, K. Debreczeni, F. Máté, Z. Tóth, T. Hermann, T. Tóth and T. Németh. 2007. Optimizing the nutrient management
with an on-line land valuation system. Mineral versus organic fertilization. Conflict or synergism? 16th International Symposium of the
International Scientific Centre of Fertilizers. 16-19. September 2007. Ghent, Belgium. Proceedings. Pp. 515-521.

Abstract 

In Hungary the obsolete “Gold Crown” land valuation system must be replaced. In spite of using the old index based on the “long-term return”
earlier for land-taxation, than for reprivatization of the land, at present for various land related transactions, now a complex index of land value
is suggested. The new evaluation is based on the agroecological assessment of the plot expressed by a soil quality index
(“D-e-METER” soil bonitation value) and on the economics of cultivation as well. The system is organized in an on-line Geographical Information
System, and provides continuously updated, easily accessible and comparable information for everyone. The map database is composed of the
1:10,000 scale “genetic soil type” map and its cartograms, digital elevation model, topographical map sheets, aerial ortophotos and soil survey
data. The core of the calculation of “D-e-METER” soil quality index is the statistical evaluation of agronomic field records (crops, crop rotations,
yields, application of fertilizers and manure) and soil and climate data. The nutrient management module of the on-line system is based on the
information collected in the framework of the Hungarian National Pedological and Crop Production Database during several years. This same data
set was used for the calculation of the nutrient factor of the soil quality algorithm. The existence of this module can also contribute to the
planning of agrotechnical operations, including fertilization. Our results showed that it is worthwhile to extend fertility evaluation to nutrient
availability of soil types grouped by similar characteristics in their nutrient dynamics. The difference between the effects of nutrient dynamics due
to climatic variation was also quantified.