Influence of Fertigation and Granular Applications of Potassium Fertilizer on Soil pH and Availability of Potassium and Other Nutrients in a Mature Planting of Northern Highbush Blueberry

Although northern highbush blueberry ( Vaccinium corymbosum L.) fields are often fertigated using soluble or liquid fertilizers, recommendations for applying most nutrients to the crop, including K, are based on the use of granular fertilizers. The objective of the present study was to compare fertigation to granular application of K in a mature planting of Duke, a popular early season blueberry cultivar that ripens from June through July in Oregon and Washington. The plants were grown on raised beds and irrigated using two lines of drip tubing per row. Treatments were initiated in 2016 and included no K fertilizer, a single application of granular potassium sulfate (K 2 SO 4 ) in April, and fertigation once a week from April to August with soluble K 2 SO 4 or liquid potassium thiosulfate (K 2 S 2 O 3 ). Each treatment was applied for 2 years at a total rate of 70 kg·ha −1 K per year. The plants were also fertigated with 168 and 224 kg·ha −1 N in 2016 and 2017, respectively, and 30 kg·ha −1 P per year. Although extractable soil K was initially low at the site (144 mg·kg −1 ), the treatments had no effect on plant dry weight, yield, fruit quality, or the concentration of K in recently expanded leaves. However, during the first year of the study, K fertigation with K 2 SO 4 or K 2 S 2 O 3 reduced soil pH and increased the concentrations of K + , Ca 2+ , Mn 2+ , and SO 4 2− in the soil solution under the drip emitters compared with no K or granular K 2 SO 4 , whereas granular application of K 2 SO 4 resulted in higher concentrations of K + between the emitters than any other treatment. Fertigation also affected the concentration of K in the fruit during the first year, although in this case, the concentration was lower with K fertigation than with no K or granular applications of K 2 SO 4 . During the second year, fertigation and granular K continued to result in higher concentrations of K + in soil solution under and between the drip emitters, respectively, but at this point, extractable soil K was higher with each of the K fertilizers than with no K. Consequently, the concentration of K in leaves sampled from entire plants in late September that year was higher with any of the K fertilizers than with no K. Potassium fertilization also altered concentrations of other nutrients in the plants, including Mg, S, B, Cu, and Mn in the leaves; Ca, Mg, and B in the fruit; Mn and Zn in the woody canes; and P, Mg, S, and Mn in the crown. In many cases, concentrations