Here's a roundup of turfgrass articles and links from the past month:

These articles on turf nutrition.

Mike Richardson shared this photo of large patch on Zoysia matrella:

large patch on Z. matrella - pic for the textbooks...pressure remains high under cool, wet conditions in NW Arkansas pic.twitter.com/MADvh0X14S

— Mike Richardson (@ArkansasTurf) May 28, 2015

A large gallery of U.S. Open course maintenance photos by David Phipps.

Comparing photosynthetically active radiation (PAR) and temperature at Corvallis and Ithaca.

Black topdressing sand has a dramatic effect in spring.

Doug Soldat is finally seeing potassium (K) deficiency symptoms on bentgrass in a sand rootzone:

After 4 yrs, starting to see signs of K deficiency! No K on left, plenty of K on right (with residual snow mold) pic.twitter.com/YILkJCBzU9

— Doug Soldat (@djsoldat) June 2, 2015

This formula gives an estimate of cation exchange capacity (CEC) in sand rootzones.

Jim Kerns reports on the TurfDiseases blog about pythium and leaf spot on bermudagrass.

Does light or temperature have a more prominent effect on turf growth?

Al Bancroft shows bentgrass nursery plug recovery:

Plugs taken from Nursery in their various stages of recovery pic.twitter.com/Iglf57Fkcn

— Albert Bancroft (@alban3074) June 10, 2015

Two short articles on simplifying soil test interpretation.

This is what photosynthetically active radiation (PAR) looks like by time of day.

This is what morning shade does to PAR.

This is what afternoon shade does to PAR.

Frank Rossi and Micah Woods spoke on TurfNet RADIO.

Multifunctional golf facilities.

For more about turfgrass management, browse articles available for download on the ATC Turfgrass Information page, subscribe to this blog by e-mail or with an RSS reader - I use Feedly, or follow asianturfgrass on Twitter. Link and article roundups from previous months are here.