DISCUSSION: This is lines 12-15. The farmland is heavily fertilized. The quickest way to fix this would be to replace the topsoil.
Logically, we must be replacing the over-fertilized topsoil with soil that has less fertilizer. Otherwise, why bother?
- We know that thistles grow in fertilized land (lines 10-11). Fertilized land is a sufficient condition. But it’s possible thistles can grow even in soil that isn’t fertilized.
- We have no idea if replacement topsoil has fungi. Presumably all soil has some fungi. The third paragraph shows that both farmed and unfarmed soil has fungi (lines 38-50).
- Why would this be true? We’re not told anything about the replacement soil. Maybe it has tons of good plants.
- CORRECT. This would make sense. We’re replacing over-fertilized topsoil. So it would make sense to use soil that has less fertilizer.
- Who knows? The soil just has to be good soil. It’s possible it was used to grow corn, then rehabilitated.
Need help with RC? → Try the RC Mastery Seminar
Solve hard passages quickly