Summary
Yield comparisons were made at three stages of maturity between half and whole tubers ofUlster Prince planted equidistant triangularly (row width 33 cm), and whole tubers planted at twice that row width at the same seed rates which averaged 4.5 and 9.0 tonne/ha.
At the same seed rate narrow rows gave no increase in total yield at the first lift, but about 1.3 tonne/ha more at lifts made 10 and 20 days later. The higher seed rate outyielded the lower by about 4.0, 6.0 and 7.5 tonne/ha in total yield for the three lifts respectively. In yield of tubers under 32 mm, there was a large response to increased seed rate and a small response to reduced row width.
Single experiments withUlster Premier andArran Pilot, showed responses which differed in some respects from those ofUlster Prince.
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Proctor, J.M. Patterns of spatial arrangement of early potatoes. Europ. Potato J. 12, 238–250 (1969). https://doi.org/10.1007/BF02368109
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DOI: https://doi.org/10.1007/BF02368109