4 Discussion
Zn deficiency is a critical problem in flooded
rice, causing rice grains with low Zn content to contribute
to human Zn deficiency (Impa and Johnson-
Beebout, 2012). Water management and Zn fertilization
are important agricultural practices for rice plants,
both of which were proved through impacting soil
conditions to affect Zn uptake by rice (Gao et al.,
2011; Impa and Johnson-Beebout, 2012). In order to
obtain high grain yield and Zn content in rice grain,
optimization of Zn source fertilizer and water management
should be assessed.