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Efficient use of nitrogen for crop production in low input subsistence farming might increase yields, reduce cost and risk in case of crop failure. The objectives were (i) to assess genotypic and environmental variation for N use traits and (ii) to determine relationships among N use traits and between N use and agronomic traits in barleys adapted to low input tropical highlands. Twenty-six barley...
Separate breeding for high and low fertilizer inputs may be required when genotype-by-fertilizer interaction involving rank-change occurs entailing additional resource commitments. Twenty-six barley genotypes were tested in 1998 and 1999 in a factorial combination of two levels of N (0 or 11.5gm -2 ) and P (0 or 2gm -2 ) on a Eutric Nitosol at Holetta (9 o 03'N, 38...
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