Table 1.

Dry weights (DWs) of roots and shoots of high (IR68144) and low (IR64) Zn-density rice genotypes during supplying ⁶⁸ZnSO₄ for 8 d at seedling stage

Time (d)	Shoot DW (g/plant)		Root DW (g/plant)		Root/shoot ratio
	IR68144	IR64	IR68144	IR64	IR68144	IR64
2	1.10*	0.84	0.28	0.33*	0.25	0.39*
4	1.33*	1.14	0.29	0.34*	0.21	0.30*
6	1.62*	1.34	0.33	0.39*	0.20	0.29*
8	1.78*	1.50	0.35	0.43*	0.19	0.29*

Plants were grown in normal nutrient solution up to 30 d (seedling stage), and then transferred into nutrient solution with 1.0 µmol/L ⁶⁸Zn. Data represent a mean of three plants

^*Statistical significance at P<0.01 between the two genotypes