reasons of yield in some places is zero

[xxjjyy69]

Hi,
Recently I use Psims-dssat to run some global cases. I found that no matter what species I chose (i.e. wheat, maize, rice, soy) or the climate data I used (AgMERRA or others), the yield in some places is usually zero, expect few years . And the area of zero yield places of different species and climate inputs in a certain year is always the same and quite large, the whole central and eastern part of China for example. So I was wondering why this happen. What can I do to avoid this. And what's these scenarios stands for?