It studied how the varieties responded to the N fertilizer rates and the
dressing stage so as to inquire into the theory that the difference existed in the
wheat quality. It applied four varieties just as Jinan17 PH82-2-2 PH97-4 and
PH97-5 in which the difference of quality was significantly. In the condition of
N fertilizer rates (high and low) and the dressing stage (the jointing stage and
the heading stage), In case, the experiment be launched in farm and...