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Fig. 1. Plan of the sorghum gene flow trial layout. Numbers were assigned clockwise to radiating arms, starting with the north-eastern arm. The central block with Redlan B-line (male fertile) was the pollen source, the arms with Redlan A-line (male sterile) were the pollen receptors. Each small square represents a block with sorghum plants. The first 10 blocks closest to the central field were located 13 m, the blocks farther away were located 28 m from each other. Veld grass were located between the arms not containing wild sorghum grasses.
