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Fertilization of sugarbeets (Beta vulgaris L.) with potassium (K) is generally not recommended in the intermountain areas of the western United States. This is attributable to the general abundance of available K and sodium (Na) in the soils of this region, irrigation water often containing significant K and Na concentrations (7), and the lack of plant response to K fertilization in numerous unpublished field experiments. Potassium is taken up by sugarbeets in large quantities and is an essential element for plant growth. Sodium also is taken up in large quantities, even in the presence of ample K, but is not considered essential (34). Sodium can substitute for part of the K needs of the plant, and sodium chloride has been used as a K fertilizer substitute in certain humid regions because of its lower cost (21). Positive yield responses have been noted from the addition of Na, even in the presence of ample K (25).

Potassium and Sodium Uptake by Sugarbeets as Affected by Nitrogen Fertilization Rate, Location, and Year