Does not compute. Why should depleted uranium have any effect on grain production. Its strong radioactive components are, as the name says, depleted. The only worry is inhalation immediately following impact.

I think there's way too much misinformation about this and way too many people talking without a clue

Then again, shooting a gun inside is stupid, until someone is breaking in and trying to kill you.

Killing the opponent is the last resort in most developed countries.

If there's one country to trust with nuclear safety it's actually Ukraine. Capable engineers and scientists, understanding of institutional failure, and certainly not least memory of Chernobyl.