Alfalfa plants must develop deep roots to obtain nutrients and water from a large volume of soil. Therefore, a vigorous stand of alfalfa starts with a well-drained, deep soil and proper fertility. Potassium stimulates and promotes root growth. It improves alfalfa's resistance to disease and weather and is essential for building plant sugars and starches. This nutrient is essential for producing chlorophyll, absorbing phosphorus and stimulating plant growth.
Magnesium increases plant strength and builds resistance to drying, insects and spray damage.
Sulfur helps produce the high levels of protein needed for top quality. Without sulfur, the alfalfa plant cannot fix and metabolize nitrogen. The sulfur in K-Mag is readily available to the plant because it's in the sulfate form.