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While new lines developed by CIMMYT under intermediate levels ofnitrogen are more nitrogen efficient than older lines, it is not knownwhether this method of selection is the most efficient. Two lines with highN up-take efficiency (UPE) were crossed to two lines with high N utilizationefficiency (UTE). Their progenies were visually selected for superioragronomic type from the F2 till the F6 under each...
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