This experiment began in 1843. The site was possibly farmed since
Roman times (i.e at least 1500 years). Map of 1623 shows field in
arable use. 1839-1843 arable crops: turnips, barley, peas, wheat, ...
This experiment began in 1852 at Rothamsted, England. The site was
occupied (farmed?) since Roman times. Map of 1623 shows field in
arable. Arable crops 1847-1851. Clay-with-flints overlying chalk; ...
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. ...