Observed and measured C-band HH, vertical–vertical polarization (VV), and horizontal–vertical polarization (HV) backscatter coefficients versus incidence angles at the booting and filling stages were shown in Fig. 3. Figures 3(a), 3(c), and 3(e) were at the booting stage, and Figs. 3(b), 3(d), and 3(f) were at the filling stage. Results in HH-, VV-, and HV-polarizations were the first, second, and third rows, respectively. Figure 3(a) is the HH-polarization, while the second row is the VV-polarization, and the third row is the VH-polarization. As shown in Fig. 3, both the observed and simulated backscatter coefficients vary with the change of incidence angles. At each incidence angle and each polarization, there might be a general agreement between the observed and modeled values since the maximum difference was less than 3 dB overall (Fig. 3). Multipolarized simulation results and measured values at the C-band vary with incidence angles. Because the HV-polarization curve is similar to that of the VH-polarization, it has not been shown here. The maximum difference between the measured values and simulation results is no more than 3 dB. Thus, it can be concluded that the simulation results from the wheat microwave backscattering model agree well with the values measured in a real-world situation. In this experiment, numerous variables affect the measurement accuracy, thus the range of 3 dB error could be taken as the normal error in the microwave scattering measurement. Around the previously mentioned two stages, since backscatter is sensitive to the flag leaves, the flag leaves might cause the oscillation of backscattering with the variation of incidence angles. The backscattering coefficients decreased and produced the wave valley in these curves. The previous researchers show that the backscattering coefficient decreases with an increase in the incidence angles. Otherwise, the curve was different from the actual situation, the reason of which could be the simplification of the extinction matrix and phase matrix. Figure 3 shows the simulation and the measured values. The main reason for this fit that is the measured data selected from the measured data base can fits the simulation well. Meanwhile, the measured data had quite a bit of difference compared to the simulation results from modified MIMICS. We consider it suitable to compare the measured data to the simulation results by our model.