Effect of Potassium Rate and Source on Yield and Composition of Bromegrass in Alaska¹

Abstract

Synopsis K application increased dry‐matter yields. Each K increment increased the K content, tended to increase the sum of cations, and tended to decrease the Ca content and Ca/Mg ratio. The P and Mg contents were independent of K application. Forage contained very high Mg and low Ca producing a very low Ca/Mg ratio. Sulfate and muriate of potash were equally effective as K sources. Second clipping forage contained more P and Mg each year than first clipping forage.

Nitrogen‐Potassium Utilization by Three Pasture Grasses1

“…Laughlin et al ( 5) reported a significant decrease in percent N in bromegrass as the K rate increased from 0 to 33 and 66 pounds of K per acre, but this occurred only in the second cutting of the second year. Vincent-Chandler et al ( 13) applied 0, 200, 400, 800, and 1600 pounds of K per acre to 4 tropical grasses and found rather consistent decreases in percent crude protein with each K fertilizer increment.…”