potassium

This is why you replicate

On February 28, 2020, I cut some Wana manilagrass rhizomes to a two node length and planted those two node rhizomes in four sand-filled pots. After eight days, I applied the first fertilizer treatment.

How MLSN works

The recording of my seminar about “How MLSN Works” is now available on YouTube. I want to correct something. At the very end, I misstated that irrigation water normally has 20 to 60 ppm (mg/L) potassium.

Updated K calculator

I made a few small updates to the MLSN K calculator. This was the first Shiny app I made, back in 2014. You can see all of them—the Turf Twitter ones, the Hargreaves ET calculator, irrigation requirement demos, PACE Turf’s GP avatar generator, and more, at the ATC Shiny apps page.

The amount of potassium leached after rain on 10 of 11 days

Monthly soil and leaf samples were collected from the 11th green at Keya Golf Club during the 2019 growing season. Andrew McDaniel and I wanted to look at the annual range of values, and changes over time, for soil and leaf nutrients.

Dandelions and potassium

A friend gave me a beautiful card yesterday and wrote “perhaps you can use this Taraxacum officinale [dandelion] in some capacity.” I certainly can. Contining with the topic of my last post—cases in which low nutrient levels are desirable—the mention of dandelions reminds me of another case in which I’d adjust fertilizer recommendations.

After 17 inches of rain, how much K leached?

When I was at Keya GC last month for the Japan Amateur Championship, it rained a lot. From June 29 to July 8, there was precipitation every day, and the total was 446 mm, or 17.

"Potassium applications have been associated with increased winter diseases in northern climates"

Who would have thought that adding potassium would increase disease? I enjoyed talking with Doug Soldat about this research when he presented “Potassium fertilization affects microdochium patch severity on creeping bentgrass” by Bier et al.

Have you seen turf that ran out of potassium?

It’s not pretty. In fact, the grass gets horrendous in a hurry when it runs out of potassium (K). Which is why, as a turfgrass manager, one wants to make sure the grass is always supplied with enough K.

The Winter’s Tale

Doug Soldat has photos showing more snow mold where potassium fertilizer was applied. Where potassium was not applied, there is less snow mold. Tried something new this year. Top left high K for six yrs, but no K after Aug 2016.

Fall potassium and winter traffic on a bentgrass green

Play on frosted bentgrass greens in Japan is not uncommon. Winston Mirmow’s thesis on Fall potassium fertilization and winter traffic effects on a creeping bentgrass putting green has some surprising results.