OMAHA (DTN) -- Significantly higher retail fertilizer prices returned the fourth week of March 2022, according to sellers surveyed by DTN. The last time two fertilizers were double digits higher was the first week of December 2021.

DAP and urea led the way higher. DAP was 16% more expensive compared to last month and has an average price of $1,014 per ton.

DAP is now at the highest level in the history of the DTN data set. The previous high for the phosphorus fertilizer was $984/ton set the first week of November 2008.

Urea was 10% higher compared to last month with an average price of $976/ton. This price continues to be an all-time high.

MAP and 10-34-0 were also up a considerable amount. DTN designates a significant move as anything 5% or more.

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MAP is up 10% from last month and had an average price of $1,018/ton. 10-34-0 is 5% more expensive compared to the prior month with an average price of $881/ton.

Three fertilizers were slightly higher compared to a month earlier. Potash had an average price of $850/ton, anhydrous $1,523/ton (all-time high) and UAN28 $622/ton (all-time high).

The remaining fertilizer was slightly lower this month. UAN32 had an average price of $698/ton, a drop from the nitrogen fertilizer's all-time high of $703, which was set last month.

On a price per pound of nitrogen basis, the average urea price was at $1.06/lb.N, anhydrous $0.93/lb.N, UAN28 $1.11/lb.N and UAN32 $1.09/lb.N.

The agreement of a labor dispute by Canadian Pacific (CP) Railway last week was one positive bit of news for fertilizer supply, Dow Jones reported last week. The company and Teamsters Canada Rail Conference reached an agreement to settle their labor dispute via binding arbitration.

"CP is a major supplier of fertilizer, especially potash, to the United States and abroad," Dow Jones reported.

Some potash disruptions might be seen from the short-lived strike, although the main stressor on fertilizer currently is the transportation disruptions in the Black Sea region. Global potash supplies have declined as producers in Russia and Belarus effectively stopped exporting the fertilizer following Russia's invasion of Ukraine, according to the report.

Most fertilizers continue to be considerably higher in price than one year ago.

MAP is now 46% more expensive, 10-34-0 is 47% higher, DAP is 65% more expensive, both UAN28 and UAN32 are 86% higher, urea is 95% more expensive, potash is 99% is higher and anhydrous is 123% higher compared to last year.

DTN gathers fertilizer price bids from agriculture retailers each week to compile the DTN Fertilizer Index. DTN first began reporting data in November 2008.

Russ Quinn can be reached at russ.quinn@dtn.com

Follow him on Twitter at @RussQuinnDTN