The nitrate/ammonium ratio had a highly significant effect on root biomass, with both FW and DM consistently increasing as the nitrate proportion rose.
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Effect of copper on nitrogen uptake, transportation, assimilation processes, and related gene expression in Chinese cabbage [<i>Brassica campestris</i> L. ssp. <i>Chinensis</i> (L.)] under various nitrate-to-ammonium ratios.
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