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Potassium Fertilization

All forms of K fertilization must cease if low K grass forage is desired, until spring growth harvested near flowering drops to under approximately 1.7% K. It then may be time to consider some K fertilization, to maintain sufficient plant K for overwintering. The amount of K applied will depend on the K content of the spring harvested forage and the native K supplying power of the soil. From 50 to 100 pounds of potash fertilizer equivalent may be needed. Never apply K prior to spring growth, as there should be adequate soil K released during the winter and early spring for spring grass growth. Monitoring of forage K levels will allow the production of low K forage without risking damage to the stand. If low K fields are not available it may be economically feasible to fertilize fields with chloride at about 100 lbs Cl/acre, lowering the cation-anion ratio.