Askov Experimantal Station (55° 28' N, 09° 07' E, 63 meters above sea level) - see on map
The experiment started in 1894.
The experiments were established to test the nutritive value to crops of farmyard manure and to compare the effect of the manure with that obtained after addition of similar amounts of N, P, and K in mineral fertilizers. Unmanured plots were included to serve as reference treatments. The effect of individual nutrients was studied in separate plots dressed with N, P, and K containing salts added individually or in combinations of two or three.
Lermarken: Morainal deposits from the earlier Saalean glacial period. Classified as a Argiudoll. Topsoil: 11% clay, 12% silt, 42% fine sand and 36% coarse sand, pH(CaCl2)=5.6. Underground: 22% clay, 14% silt, 35% fine sand and 30% coarse sand, pH(CaCl2)~4.
Sandmarken: A coarse sand soil (4% clay, silt 5%, fine sand 35% and coarse sand 57%)
The archive contains samples of crops and soils for the whole period.
