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Seed yield of Brassica napus varieties grown in the field as a function of primary root length in the HTP system. Field data are means of triplicate plots at Bingham and Deeping in 2012–13 (A, B), at Bingham in 2013–14 (C) and at Deeping in 2014–15 (D). HTP data are means of ∼40 replicates imaged 14 d after sowing. **P < 0·01.
