Germany Sees US as Vulnerable to Squeeze on Potash Supplies

German authorities seeking to map out US supply-chain vulnerabilities as a way to win leverage with President Donald Trump’s administration have identified a key pressure point: potash.

The US imports more than 90% of the key ingredient for agricultural fertilizer, leaving the world’s No. 1 economy highly reliant on global producers — above all Canada. Potash, a potassium-rich fertilizer made from underground deposits, would be among options for US allies should Trump further ratchet up trade and security threats, according to people familiar with the considerations.