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A study was initiated to determine the effects of fall fertilization, specifically N application rate and additions of supplemental K on the production of woody ornamental shrub species. The influence of two slow-release sources of K (4- and 8-month) in the form of K 2 SO 4 , three K application rates (0, 1, 2 lb/yd 3 ), and four incorporated application rates of N (0, 1, 2, and 3 lb/yd 3 ) from Osmocote Plus+ 15-9-11 were evaluated on the growth of `Fisher Pink' Indian azalea, glossy abelia, and `Tuscarora' crape myrtle. Growth of `Fisher Pink' azalea, as determined by shoot height and shoot width, increased as N rate increased from 1 to 3 lb/yd 3  when compared to the control. The resulting growth index improved at the 2 and 3 lb/yd 3  N rate when compared to the 0 and 1 lb/yd 3  N rates. Height and width of glossy abelia at the 1 lb N rate with or without supplemental K applications increased when compared to some glossy abelia at the 3 lb N rate (primarily those with supplemental K). Glossy abelia at the 2 lb/yd 3  N rate with 2 lb/yd 3  N from 4-month 0-0-46 had significantly greater shoot dry weight when compared to the 3 lb/yd 3  N rate with 2 lb/yd 3  N from 8-month 0-0-46. The 1 to 3 lb/yd 3  N application rate had more of a response on growth index, visual quality, and visual color on `Tuscarora' crape myrtle as compared to the 0 lb/yd 3  N rate. In this study, the potential influence of supplemental K applications on plant growth was mostly evident for glossy abelia at the 2 lb/yd 3  N rate and was not evident on azalea or crape myrtle.

Effects of Nitrogen Application Rate and Supplemental Potassium on Fall Production of Nursery Crops