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Aims If rice has a higher nitrogen use efficiency for dry matter production (NUE) and grain yield (NUEGY) than wild annuals, we may question whether the higher NUE is due to a higher productivity per plant N (NP) or a longer retention time of plant N (MRT) or both, and whether the higher NUEGY results also from a higher harvest index (HI). Methods Stands of rice were established at three N levels...
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