Ann: Annual Financial Report, page-34

Where the urea price will be in two to five years is pure speculation. That's why I invested in LCK. Lowest cost quartile globally with their own supply of gas so don't need to worry about where the gas price might be in future years.
You can invest in a current producer for the potential of further short term gains but the market is forward looking. If urea prices are going to fall in 12 months, get ready to sell your producers soon, well before prices begin to moderate. You might see their share prices fall significantly.
I'm betting that LCK will be many multiples higher in 2 years irrespective of where the urea price is at that time.