Lithium, Sodium, Potassium, Rubidium, and Cesium

By P. A. Helmke, D. Sparks. SSSA Book Series, 2018

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Effect of Irrigation Regimes and Soil Texture on the Potassium Utilization Efficiency of Rice (2019, neutral): “Available so l potassium (K) was determine using a flame photometer (FB640N, Wincom, Hunan, China) [40].”
Soil amendment with biochar increases maize yields in a semi-arid region by improving soil quality and root growth (2016, methodology): “Available K was extracted with 1.0mol L 1 ammonium acetate solution (pH 7.0) and determined with flame photometer (Helmke and Sparks 1996).”