On March 15, 57 kg of urea-N haÿ1 were applied to
the fi
eld, followed on 10 April by 54 kg N haÿ1 (ammonium
nitrate), 25 kg K haÿ1 and 12 kg S haÿ1 (in a
blended fertiliser) for ®rst cut silage in mid-May. On 16
May, 11 strips (approximately 8 m´ 1 m) were cut at
selected locations in the ®eld (Fig. 2(b)) to provide some
real yield data with which to validate the model predictions.