Even coverage of the field of straw.

[Adrino101]

Hi
I play a map with SoilMod and chopped straw plugin.
The harvest of corn will cover the complete field. But harvesting rape and sunflower skips gaps in coverage. These gaps are not processed with SoilMod. The field is not covered by the same value N and PK. Plowing or cultivating corn yes. There is a solution to this?
Thanks for the explanation.