Brizeen nitrate was a substance commonly used as a fertilizer.
Grand Nagus Zek offered Bajor, on the behalf of Kira Nerys, 50,000 kilos of brizeen nitrate, in exchange for allowing him to hold a trade conference on Deep Space 9 with the Dosi.
Kira noted that with a quantity of that size, Bajor could fertilize the entire northern peninsula. (DS9: "Rules of Acquisition")