BS
The same old story: Everything starts out sweet and rosy and then eventually goes to s...
What’s the issue? I’ve always slept in a manured bed.
First of all, there were no Scots in Scotland in 6000 BC. In fact there was no Scotland yet either.
Second, it would have been more to the point to say "early farmers in (what today is Scotland) didn't fertilize their crops." Because saying "they didn't fertilize with manure" implies they did fertilize with something, it just wasn't manure.
Something these researchers/writers dodge is that if you tried to grow similar crops in the Orkney Islands today, with or without nitrogen fertilizer, you would have a problem. It’s too cold.
No sh*t.