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.