Ammonium inhibits primary root growth by reducing the length of meristem and elongation zone and decreasing elemental expansion rate in the root apex in Arabidopsis thaliana.

PLoS One · 2013 · PMC3620058 · PMID 23577185

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On day 5, the apparent length of the meristem was reduced by ∼30% by ammonium, a highly significant reduction ( Figure 3B ).

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