Zn fertilization had significant impacts on Zn
concentration and accumulation in the rice plants
(Table 4) and grains (Figs. 1 and 2). Compared to no
Zn application, Zn fertilization significantly increased
Zn concentrations in both shoot and root by 11.4%–
14.5% and 37.4%–52.2%, respectively. Zn concentration
in brown rice increased from 29.3 mg/kg in the
control treatment to 32.4 mg/kg by ZnSO4 fertilization
and to 31.5 mg/kg by Zn-EDTA fertilization, and
increased overall by 10.6% and 7.5%, respectively.
And the Zn concentration in polished rice increased
from 23.3 mg/kg in the control treatment to 24.7 mg/kg
by ZnSO4 application and to 24.8 mg/kg by Zn-
EDTA application, and increased overall by 6.3%
and 6.6%, respectively. Zn accumulations in both
brown rice and polished rice showed increases of
27.8%–38.3% and 29.7%–43.7%, respectively, depending
on different Zn sources. And these effects
were much more pronounced when Zn was supplied
with ZnSO4.