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Different rates of superphosphate and their aftereffect. The experiment no42 - LTSE

Location:
Metsniereba st.#1, Anaseuli, Ozurgeti
Georgia
Latitude: 42.423456
Longitude: 41.308593
Background
Continent: 
Europe
Year LTSE Began: 
1933
On-going or Terminated?: 
On-going
Comments: 
Under mixed forest before 1928. Clearing in 1929. Tea plantation was founded after 45cm depth soil trenching in 1929. Experiment was initiated by G. Urushadze in 1933.
Environment
Annual Precipitation (mm): 
>2000
Soil moisture regime: 
Ustic
Landuse: 
Arable
Ecoregion: 
Warm Subtropical
Slope (%): 
2-5%
Elevation (m): 
0-200
Experimental Design
Design (short description): 
Plantation with chess layout of brushes (1x1m). Hill country, slightly inclinated south–east, south and south–west 3–50 slopes. Soil trenching took place before sowing. Phosphorus fertilizers were applied according to the fertilization scheme in the period 1933–1935. In 1940 annual rates of P2O5 were increased from 60 to 120kg/ha in one treatment. Phosphorus fertilization rates were not changed in the period 1936–1953. Then the site has been divided on two parts : half of each treatment used for monitor aftereffect of fertilizers, the second half has been used for application phosphorus fertilizers without change. In latter case superphosphate was applied in 1953, 1965, 1974, and 1980. Sulfate ammonium as nitrogen fertilizer in annual rates 200kg/ha from 1937 to 1948, and since 1949 - 300kg/ha . K fertilizers were applied in annual rates 120kg/ha periodically, and since 1949 –– 200kg/ha once in two years. Long-term residual effect (more than 50 years) for big rates of P application was demonstrated. Bulk application of big rates is more advantageous than annual rate of 120 kg/ha.
Permanent plot area (square meters): 
3000-10,000
Soil Classification
Soil taxa (ex, Great Group of Soil Taxonomy): 
Soil FAO type description: Ferrisol Russian classification: red soils Description of native red soil horizons A0 horizon (sod or litter layer) –– 3–4cm, contains partly decomposed fern and trees’ leaves. A horizon (humus horizon) –– greyish–dark brown, cloddy - granular loose structure, clay loam, abundant of fern roots –– 20–25cm thickness. B1 horizon – transition horizon, cloddy, clay–loam & clay, slightly compact B2 horizon –– brownish–red with black & light–yellow mottles, more compact than previous horizon, thickness of B1+ B2 is more than 35–45cm C horizon –– parent rock, with heterogeneous red color, abundant big Fe–Mn nodules & light-yellow Si mottles, subangular cloddy structure, clay loam, compact. Water holding capacity…38–48%
Soil/Data Archive
Sample frequency: 
Annual
Soil Solid Data
pH and acidity: 
Yes
Nitrogen: 
Yes
Other macronutrients: 
Yes
Bulk Density: 
Yes
Soil Water Data
pH and alkalinity: 
Yes
Other macronutrients: 
Yes
Vegetation Data
Macronutrient contents: 
Yes
Harvest mass: 
Yes
Harvest nutrient contents: 
Yes