Hungarian long-term fertilizer experimental network, Kompolt

This experiment has been added by the GLTEN Curators using existing published sources.
Local identifier
Years operational
This is one of nine sites of The National Long-Term Fertilization Trials (NLFT) Network, originally set up to evaluate the effects of NPK fertilizers on crop yields in eight different agro-ecological regions of Hungary.
The Hungarian field trial network , "OMTK", was established at 26 different sites representing the main agro-ecoregions of the country, only nine of these sites now continue. The trials were started in the autumn of 1967 in a rotation of winter wheat-corn-corn-peas. These trials consist of increasing nitrogen, phosphorous and potassium rates and combinations of these mineral fertilizers. The trials were initiated to establish a uniform network of fertilizer trials were initiated to establish a uniform network of fertilizer trials representing different agro-ecological regions of the country. The aim of these trials was to study the effects of increasing fertilizer rates on soil nutrients as well as to predict fertilizer consumption in Hungary. In recent years investigation son the environmental impact of fertilisation has become a primary importance. The nine sites are at several different universities and research institutes and the program is supervised by the Pannon University of Agricultural Sciences at Keszthely which is the founder of the trials and responsible for directing and coordinating the maintenance of the sites, the analysis of soil and plant samples, the processing of data and interpretation of results.
Data Access Statement
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Data license
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Data policy
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Pannon University of Agricultural Sciences, Keszthely
Is the centre for coordination of the field trial network

Site: Kompolt

Local code
Northern Hungary
Geographic location
47.785438, 20.199597
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Visits permitted?
Cropping intensity: Conventional, Conservation.
Soil type
Haplic Phaeosem (FAO)
Soil description
Soil type (USDA): Mollisol Soil texture: clay loam
Soil properties
VariableDepthValue (range)UnitsRef yearEstimated?Baseline?
soil organic matter 2.6
soil pH 3.9
clay (<0.002mm) Percent
total K in clay fraction 2.1 percent
Climate properties
VariableTime periodValue (range)Units
annual total precipitation542 millimeter

Design period: Current design period (1967—)

Four-year crop rotations were initiated over a successive four year period after 1967, 1968 and 1969.
CropYears grown
winter wheat
Factor name
Factor levels
nitrogen fertilizer exposure
N 0  (0 kgN/ha)
N 50  (50 kgN/ha)
N 100  (100 kgN/ha)
N 150  (150 kgN/ha)
N 200  (200 kgN/ha)
N 250  (250 kgN/ha)
phosphate fertilizer exposure
P 0  (0 kgP/ha)
P 50  (50 kgN/ha)
P 100  (100 kgP/ha)
P 150  (150 kgP/ha)
P 200  (200 kgP/ha)
potassium fertilizer exposure
K 0  (0 kgK/ha)
K 100  (100 kgK/ha)
K 200  (200 kgK/ha)
yield componentsNot specified
soil organic carbonNot specified
soil propertiesNot specified

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