Effects of husbandry practices on the seed yield and oil content of linseed in Northern Scotland

Field trials at two sites assessed the effects of different husbandry practices on seed yield and oil content of linseed (Linum usitatissimum L). A pot experiment investigated very early sowings. In the field trials maximum seed yields were achieved from sowings over a longer period at Elgin than at Aberdeen. Sowings in pots before mid‐March resulted in poor plant establishments. Yields responded to nitrogen fertiliser levels greater than 40 kg ha⁻¹ only on the lighter Elgin soils. There appeared to be no yield advantage from establishing more than 400 plants m⁻² at either site. Plant growth regulators reduced plant height and, where lodging was reduced, increased yield. Seed oil contents were influenced more by environment than by husbandry; high nitrogen applications on light soils gave significant reductions in oil content.