Fig. 9. Maps of the updated simulations of aboveground biomass
(W above) (a), yield (b), aboveground N content
(N above) (c) and grain N content
(N grain) (d) at maturity in year 2020 at the
experimental site. Both mean and standard deviation (STD) of each state
were derived from their updated ensemble values in EnKF. N0, N40, N80,
N160, N240 and N320 denote varied nitrogen (N) application rates (see
Table 2 for details).