RE: Ok, so what caused.....16 Sep 2019 18:40
I think the crash is because of the short term demand slump for potash reported by Nutriens. They've had to mothball three mines:
https://uk.reuters.com/article/nutrien-potash/nutriens-potash-earnings-to-take-a-hit-on-mine-shutdowns-idUKL3N2624GN