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In three experiments with spring barley cultivars yield differences between cultivars were different for plots and drilled strips, and in breeders' plots the differences depended on whether they were harvested with a large or small header. Breeders' plots yielded about 44% more than drilled strips or 8% less than drilled. Strips of path area were allowed for. A smRll harvester was less efficient than a large one. There was no significant seasonal variation in yield with 'Zephyr' barley in drilled strips, but in breeders' plots there were significant yield differencef 267

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