Hungarian long-term fertilizer experimental network, Keszthely

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
Don't know
Data Access Notes
The dataset from this trial is available in the prototype standard data format for the European GCTE SOMNET.
Data license
Don't know
Data policy
Don't know
Pannon University of Agricultural Sciences, Keszthely
Is the centre for coordination of the field trial network

Site: Keszthely

research station field
Local code
West Hungary
Geographic location
46.776563, 17.246622
© OpenStreetMap contributors
132 Metres
Visits permitted?
Before the trials began, winter wheat was grown on the experimental plots
Cropping intensity: Conventional, Conservation. Types of crop: Crops: wheat, maize, winter and spring barley, alfalfa, red clover, rape, oat, sudan grass, vetch, pea and potato. Management of soil, water, nutrients and pests: Conventional tillage, no irrigation, different rates of organic and mineral fertilization, integrated pest management. Soil improving cropping system and techniques currently used: Rotation, intercropping, green manure, mulching, minimum tillage.
Soil type
Eutric Cambisol (WRB, 2006) (FAO)
Soil description
Soil type (USDA): Alfisol Soil texture: sandy loam Soil texture is dominantly clay loam with medium soil hydraulic conductivity and high water holding capacity. The bulk density of the undisturbed soil was 1.53 g cm-3. The pH of the soil is slightly acidic, the surface horizon does not contain calcium carbonate. The naturally available phosphorus content of the soil is low (ammonium-lactate [AL] soluble P2O5: 60-80 mg kg-1), the potassium content medium (AL-K2O: 140-160 mg kg-1) and the soil organic matter content fairly low (16-17 g kg-1). Land use type is arable land. Pedo-climatic zone: Pannonian, brown forest soils.
Soil properties
VariableDepthValue (range)UnitsRef yearEstimated?Baseline?
soil organic matter (1.3 – 1.7) percent
soil pH (5.9 – 6.3)
calcium carbonate 0.1 Percent
clay (<0.002mm) (22 – 24) Percent
bulk density 1.53 g cm-3
total K in clay fraction 2.1 Percent
Climate description
Semi-continental with maritime influences, moderately warm, moderately humid, high sunshine hours.
Climate properties
VariableTime periodValue (range)Units
100 year average annual precipitation683 millimeter
long-term annual mean temperature10.8 degree Celsius
50 year average annual precipitation 1901-1950716 millimeter
50 year average annual precipitation 1951-1980709 millimeter
Rainfall average 1 October- 31 March (250 – 300) millimeter
Rainfall average 1 April -30 September (400 – 450) millimeter
50 year average daily air temperature 1901-195010 degree Celsius
Average air temperature January-1 degree Celsius
Average air temperature July21 degree Celsius
average air temperature during period of vegetation growth17 degree Celsius
Average solar radiation 1951-19801800 hours per year
Annual potential evapotranspiration860 millimeter
monthly average soil moisture content in upper 20 cm (22 – 37) millimeter

Design period: Current design period (1967—)

Four-year crop rotations were initiated over a successive four year period after 1967, 1968 and 1969. Experiments were initiated on plots of 50-70 m2 with one of two crop rotations and one of a corn monoculture.
Design description
Each experiment has 20 treatments with four replicates of each treatment.
CropYears grown
winter wheat
Crop Rotations
crop rotation A
  • 1
    winter wheat
  • 2
  • 3
  • 4
crop rotation B
  • 1
    winter wheat
  • 2
  • 3
  • 4
    winter wheat
crop rotation C
  • 1
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 kgP/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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