potassiferousadj.

1890 Cent. Dict. Potassiferous, containing or yielding potash or potassic salts.

1911 Encycl. Brit. XXII. 197/2 The Stassfurt minerals..are insignificant compared with the abundance and variety of potassiferous silicates, which occur everywhere in the earth's crust.

1918 J. S. Morton & A. Watkins Hist. Nebraska xxxv. 839 The potassiferous solution from wood ashes was boiled down or concentrated in pots.

1932 Industr. & Engin. Chem. 24 366/2 The first three sections include all the analytical methods applied to the various phosphatic, nitrogenous, and potassiferous fertilizer materials.