Ann: Annual Financial Report, page-12

Mainly about the phosphate market but mentions urea as well and is a good indication of what is happening with fertilisers broadly with a very tight market.
"China is banning the export of phosphate, a major component of commercial fertilizer, through 2022.“Fertilizer prices have increased dramatically in recent years, and the news coming from China will more than likely help this trend continue,” said Theresa Sisung, field crops specialist for the Michigan Farm Bureau. “Farmers should talk to their retailers sooner rather than later to discuss their options for purchasing fertilizer for their 2022 crop needs.”According to John Ezinga, vice president of agronomy at Michigan Agricultural Commodities Inc., the move will adversely affect prices.“Growers are going to feel it,” Ezinga said. “Look at your ratios on corn: N, P, K. It’s way out of whack right now.”Prices of urea, DAP, MAP, and potash averaged $572, $702, $776, and $598 per ton last week, all of which are up 59% or more from 2020."

https://www.wisfarmer.com/story/news/2021/09/28/china-halts-phosphate-exports-fertilizer-prices-expected-soar/5907300001/