Woods, M.S., Ketterings, Q.M., Rossi, F.S. and Petrovic, A.M. (2006), Potassium Availability Indices and Turfgrass Performance in a Calcareous Sand Putting Green. Crop Science, 46: 381-389. https://doi.org/10.2135/cropsci2005.0218
More information on Dr. Woods and on his potassium publication can be found here:
https://www.asianturfgrass.com/publication/woodsetal-2006-crop-sci/
Asian Turfgrass YouTube Channel:
https://www.youtube.com/channel/UCnm7lFvxZ85tt9ClUYRtfnw
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Turfgrass Programs and Extension Service Information:
https://www.usna.usda.gov/assets/images/as_pdf_image/LandGrantColleges.pdf