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Potassium Rate and Source Influences on Yield and Composition of Bromegrass Forage¹

Objectives of the study were to determine K rate and source optima for bromegrass (Bromus inermis Leyss.) and effect of treatments on uptake and balance of K and other nutrient elements. A 2-year field study compared six rates of two K sources on bromegrass grown on a K-deficient area. Dry matter yields were determined and the forage analyzed for N, P, K, Ca, Mg, AI, Ba, B, Fe, S, Sr, Cu, Zn, and Mn concentration.

Each K xate increased K concentration of each cutting both years and decreased the Ca and Mg percentages. KCI increased K percentages, but had little effect on forage color, yield, or mineral uptake. Potassium sulfate increased both yields and mineral uptake. All K₂SO₄ rates eliminated the yellow foliage color. Each K increment of this K source increased the K and S percentages and uptake.

Results indicate that both K and S deficiencies were present. Of the applied N, P, K, and S brome foliage removed 70 to 194%, 36 to 76%, 109 to 155%, and 19 to 95%, respectively.

Key Words: Alaska • Bromegrass • Calcium • Copper • Magnesium • Potassium • Subarctic • Sulfur

² Research Soil Scientists, Plant Science Research Division, Agricultural Research Service, USDA, and Laboratory Technician, Univ. of Alaska, Institute of Agricultural Sciences. Palmer, Alaska 99645.

Received for publication May 5, 1972.