Phil Collinson asked an interesting question: when calculating N inputs, do greenkeepers account for N added outside of fertilizer?
Greenkeepers - when calculating N inputs for the year do you account for N outside of fert?
In the last ATC update newsletter I included a survey about future video topics. These are the results.
Thanks to everyone for the feedback! A topic that has been on my mind and that I want to explain further is N fertilizer and ClipVol.
There’s an interesting article by Espevig et al. on Effects of rolling and N-fertilization on dollar spot and Microdochium patch on golf greens in Scandinavia.
rolling a red fescue green two times a week reduced dollar spot by 61% compared to no rolling rolling four times a week reduced dollar spot by 95% increasing annual N on a creeping bentgrass + Poa annua green from 15 to 24 g/m2 reduced dollar spot by 24% but the following spring saw twice as much Microdochium patch on the plots which received the higher N rate There are a number of surface performance benefits that come from rolling, and disease suppression is one of them.
I put the series of genki level (GL) blog posts together into this 17 page pamphlet.
The pamphlet explains how one can calculate the genki level from the actual N supplied as fertilizer compared to a standard amount of N for any time duration.
In this series of posts, I’ve showed how one can start with temperatures and go all the way to a standardized comparison of growth in response to nitrogen supply. In this one, I want to emphasize which of these are real, which aren’t real but are useful, and to make an argument that this is a lot easier than it might seem.
The amount of nitrogen (N) supplied over a certain time duration, compared to a standard amount, is what I call the genki level (GL). And the amount of clippings harvested over a certain time duration, compared to a standard amount, is what Jason Haines calls the turfgrass speedo.
I showed in part 1 how one can go from temperature to a temperature-based growth potential to a standard N amount.
By looking at the actual N applied, and comparing that amount to the standard N for any location, one gets what I call the genki level.