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Published online by Cambridge University Press: 03 October 2008
Root and sugar yield responses of the Polyrave variety were more favourable to the lower of two population levels (70,000 and 92,000 beets/ha.) and to the wider of two between-row distances (60 and 50 cm.). When the triploid Trirave variety was space planted and, for comparison, conventionally planted and thinned to 3 population levels at 60 cm. between-row distance, the intermediate (87,000 beets/ha.) level gave the highest sugar yield. The thinned treatments consistently outyielded the corresponding space-planted treatments. Space planting at 40 cm. between-row distance resulted in high beet populations (130,000 beets/ha.) which evoked unfavourable responses in root and sugar yield and even in sugar content.