The Deherain long-term field experiment was started in 1875 to study the
impact of fertilization on crop yield. Before 1875, the soil was
cultivated with alfalfa without fertilization. Between 1929 ...
This experiment was established in 1958 and consists of a continuous
corn system with various levels of nitrogen application. In the
preceding 25 years, there was continuous corn
with residue burning. ...