Abstract:Five maize inbred lines, (478,H21,Wu312, Zong31,Baici), selected from previous field and pot experiments were used in order to compare the genotypic variations in total N uptake, N partition between shoot and root and its relation to root morphology at four nitrate levels (0.04,0.4,2, 4mmol/L). Seedlings were grown in solution cultures. The results showed that 478, a N efficient variety, partitioned a larger amount N to its root in comparison with the other inbred lines. The percentage of root N accumulatio...