GREENKEEPER BLOG
PGR & DMI GDD Models v2.0
By Bill Kreuser, PhD We first started talking about PGR growing degree day (GDD) models back in 2008. These models use daily average air temperature to estimate PGR longevity and help schedule PGR re-application events. The original model was limited to Primo Maxx...
Growth potential models can improve management efficiency
By Bill Kreuser, PhD Turfgrass response to nitrogen fertilizer depends on many factors like temperature, sunlight, water availability, root health, and soil compaction. Some factors like soil water content and compaction can be altered by turf managers with irrigation...
The Nuance of Growing Degree Day Calculations
By Bill Kreuser, PhDFor twelve years now, I’ve been talking and writing about using growing degree day (GDD) models to schedule plant growth regulator (PGR) applications. But GDD models have many other uses in turf management. For example, there are models to predict...
SOIL TESTING INTERPRETATION IS BROKEN
By Doug Soldat, PhD The old saying goes “don’t guess, soil test”. The thought behind this axiom is that soil testing can prevent unnecessary applications of fertilizer that would’ve been applied if not for the soil test. This is probably true in some cases; but EIFG’s...