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Potassium Availability Indices and Turfgrass Performance in a Calcareous Sand Putting Green

^a Dep. of Horticulture, Cornell Univ., 134A Plant Science, Ithaca, NY 14853
^b Dep. of Crop and Soil Sciences, Cornell Univ., 817 Bradfield Hall, Ithaca, NY 14853

View larger version (45K): [in a new window]   Fig. 1. Mean K extracted by 0.01 M SrCl2, 1 M NH4OAc, Mehlich 3, Morgan, and 1:5 H2O, from a calcareous sand rootzone at Ithaca, NY, to which six rates of K fertilizer were applied from 2002 to 2004.

View larger version (26K): [in a new window]   Fig. 2. Precipitation and irrigation from June 2002 through May 2004 at the test site in Ithaca, NY. Thirty-year precipitation averages (1971–2000) are shown for comparison.

View larger version (27K): [in a new window]   Fig. 3. Relationship between K application rate to a calcareous sand putting green at Ithaca, NY, and the associated creeping bentgrass leaf tissue K content at 15 sampling events from 2002 to 2004.

View larger version (22K): [in a new window]   Fig. 4. The effect of creeping bentgrass leaf N content on corresponding leaf K content. Data shown are from a calcareous sand putting green at Ithaca, NY, with leaf samples collected on 28 July and 22 Sept. 2002 and 27 July and 16 Nov. 2003.

View larger version (39K): [in a new window]   Fig. 5. Relationship between K extracted from a calcareous sand putting at Ithaca, NY, and corresponding creeping bentgrass leaf K content. Data are from soil and leaf samples collected on 28 July and 22 Sept. 2002 and 27 July and 16 Nov. 2003. Results for five different soil extraction procedures are shown. Upper plots show the relationship between extracted soil K and leaf tissue dry weight K content. The lower plots keep extracted soil K the same, but express the leaf tissue K as a percentage of the sum of positive charge from leaf nonacid cations.

View larger version (13K): [in a new window]   Fig. 6. Visual ratings of gray snow mold (Typhula spp.) damage as percentage of plot area affected following snow melt at Ithaca, NY, in 2003 and 2004.