information. Its main purpose was to develop and verify a
comprehensive yield database. Some farmers conveniently recorded
yields as number of total bales per year across the whole farm,
but some also distinguished field-specific yields. Conversion of bale
number to weight was based on the assumption that each bale (size
0.9 1.2 2m) consisted of 600 kg at 25% moisture content (i.e. an
equivalence of 450 kg oven dry matter per bale).