40, 30, & 20
Estimating daily light integral (DLI) in Tennessee

Read these articles, but disregard the subtitles

When I saw there was a new article at Golfdom about sodium causing agronomic challenges on sand putting greens, I clicked the link to see what this was about.

That link took me to the article by Obear and Soldat in which they explain that sodium does not cause agronomic challenges in sand putting green soils:

"Sand putting green soils have low clay contents and are therefore unaffected by sodium ... The findings from this study suggest that sodium will not negatively affect putting green soils with low clay content, including those constructed to USGA recommendations ... In the case of sand-based putting green root zones, which often have very low clay content, increasing exchangeable sodium percentage well above the standard sodicity threshold of 15 percent had no effect on hydraulic conductivity."

But the link is www.golfdom.com/sodium-causes-agronomic-challenges-for-sand-putting-greens, which seems the opposite of what the article is about. Sodium causes agronomic challenges for sand putting greens? Maybe if the sand putting green is made of clay.

That reminds me of the subtitle for the article Frank Rossi and I wrote about the Park Grass experiment for the Green Section Record. One of the things I thought was amazing was how soon the botanical composition on the Park Grass field changed in response to fertilizer treatments. We wrote about that in the article, quoting Lawes and Gilbert from their first paper on the botanical composition of the experiment, published just a few years after the first treatments were applied:

"the plots had each so distinctive a character in regard to the prevalence of different plants that the experimental ground looked almost as much as if it were devoted to trials with different seeds as with different manures [fertilizers]."

The fertilizer treatments began in 1856. We didn't put these quotes in the article, but it is clear the effects were noticed immediately. More from Lawes and Gilbert:

"So striking and characteristic, indeed, were the effects produced in this respect, that, in 1857 and 1858, the subject was thought of sufficient interest to induce us to request the examination of the plots by Professor Henfrey, to which he kindly assisted.

An endeavour was also made in the second year, 1857, to separate, and determine, the proportion of the different plants in carefully averaged and weighed samples, taken from the several plots as soon as the grass was cut."

So I was surprised that the subtitle of our article, when I saw it published, was Sometimes the value of a turfgrass management practice takes a long time to become apparent. That's not quite what we were trying to say.

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