Originally Posted by Smallaxe
Keep in mind that this area is a couple months ahead of CentroWisco, so the definitions of Winter and Early Spring are @ different months... enjoy...
"... root and shoot activity and plant respiration rates increase during the late winter and early spring, plant carbohydrate content generally decreases. This decline may be quite significant when the turf receives an early season (February-April) nitrogen application, as compared to grass that has not been fertilized since the previous fall. The rapid decline occurs because carbohydrates are needed to support the increased shoot growth resulting from nitrogen applications made early in the season. Conversely, the more slowly-growing, late-season-fertilized turfgrass plants may possess a larger carbohydrate pool during the spring period. As will be discussed later, the process of spring root production can benefit from this greater concentration of carbohydrates from a late-season application. ...
...The true advantage that late-season fertilization provides to turfgrass root growth is realized during the following spring. It has been shown that the root growth of turf fertilized during the late-winter/early spring declines soon after nitrogen application (3 & 5). Conversely, turf fertilized using the late- season concept becomes green early and rapidly, without the need for an early spring nitrogen application, and root growth continues at a maximum rate. It appears that the excessive shoot growth encouraged by early spring nitrogen applications utilizes carbohydrates that may otherwise be used for growing roots ..."
It would actually be informative to read that entire section about root growth, as I only highlighted the relevant point...
I'm not sure your article is relevant to this discussion. No one here is talking about spring applications. We're all talking about fall applications. You said in your first post that fall applications should be timed such the N is used and depleted before winter. The article you linked suggests that fall applications should be made late enough that the N is NOT depleted before winter and carries over until spring, so that the nutrients are present without needing a spring application.
You just linked to an article that said what I already said and what most of the posters here are already doing.