The pollination requirements of swede rape (Brassica napus L.) and of turnip rape (Brassica campestris L.)

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Abstract
The pollination requirements of eight cultivars of swede rape (Brassica napus) and two of turnip rape (Brassica campestris) grown in a glasshouse, were compared. Cultivars differed in the number of pods, and of seeds per pod set by auto-pollination. Cultivars of turnip rape yielded more when cross-pollinated than when self-pollinated by hand but those of swede rape did not, although additional pollination of swede rape increased the set of early flowers. Inadequate pollination probably limits yield in self-fertile cultivars of swede rape that auto-pollinate poorly and in turnip rape cultivars that are nearly self-sterile.