Secondly, it is easier to protect the grave when buried in one's own crops. During Tomb-Sweeping Day and the Lunar New Year, I often go to the cemetery to pay homage to the graves of my deceased relatives. In your own crops, it is also convenient to protect, and sometimes you can weed and protect when you do farm work. If it's on someone else's land, it's not necessarily. Maybe after a long time, the cemetery may not be found.
Finally, there is another point, that is, growing your own crops can effectively avoid moving graves. In other people's farmland, it may be what they want to use in the future. If it is used for other purposes, it may involve moving graves. Moreover, China people pay attention to graves since ancient times, and it is also taboo to move graves.
As for some people, I wonder why it is cultivated land, not wasteland or woodland. That's because people often go in to farm and work in crops. If it is wasteland and woodland, another problem will be involved, that is, no one goes in these places all the year round. At that time, it is inconvenient to sweep graves and it is not conducive to the protection of cemeteries. Farmers also heard that people died in some places, and they even buried people in their own fields. This practice is actually to express my thoughts about my loved ones. Because I often work in my own field, when I see it, I will think of my dead relatives and express my thoughts for them.