Dormant fertilization is one turfgrass management practice
that I believe is vital to a successful upcoming season. I have been a big fan of dormant fertilization
throughout my entire career. My
definition of dormant fertilization is: fertilizing
when temperatures have dropped sufficiently to stop top growth - basically,
when mowing has ceased. At this time, however, root growth can still be active.
What fertilizer is best for dormant fertilization? There are many choices, but for 40+ years of
golf course management career I have used the natural organic Milorganite. Milorganite
was my go-to fertilizer for all
dormant applications. Each fall when top
growth stopped, we fertilized the entire golf course with Milorganite.
|
Alway a great time of year when the dormant Milorganite application goes out! |
|
Always a smile on my face when spreading Milorganite. |
Greens, tees,
fairways, and rough all received between 0.75#N/M-1.25#N/M. Even today, as a consulting agronomist, it is
the single most important fertilization practice I recommend and discuss with clients.
I do get questions on why Milorganite.
So, let’s discuss the reasons why it’s
such a great fertilizer and why it’s particularly great for a dormant
application.
First, Milorganite
has been in business for over 90 years. That is some kind of staying power.
Some of the reason for that is the consistency with the manufacturing of this
product. In my 40+ years of using this
material, I have never opened a bag that had an issue - truly remarkable.. To
have a better understanding of the production of Milorganite, check out this great video link, HERE.
|
The consistency in the manufacturing of this product is truly amazing! |
Second, Milorganite
may be the most researched fertilizer in the world. So, why is it such a great
dormant fertilizer choice? First, as an
organic, it is very stable and leaching concerns are non-existent during
fall/winter. So, from that aspect, it is
very environmentally safe and gives great piece of mind. From a turfgrass plant
use, the real key to dormant Milorganite
is all about nitrogen mineralization. Consistent
research results show that microorganisms responsible for the mineralization of
the organic nitrogen in Milorganite
remain active even in frozen soils. The
percent of nitrogen mineralization throughout the winter period has been shown
to be in the 15% range. This has been
documented multiple times through university research.
|
Possibly the most researched fertilizer ever! |
So for example, if you apply 1#N/M to your
fairways as a dormant application, there will be 0.15N/M available immediately
to the plant after snowmelt. Nitrogen
availability, along with the iron content, will produce tremendous spring
green-up without any flush of growth.
|
Early spring fairway green-up. |
|
Early green surface green-up. |
This nitrogen availability will easily be
2-3 weeks ahead of any spring-applied fertilizer. So, it’s that time of year to
set yourself up for next season – using Milorganite as dormant fertilization will certainly be a big help! Milorganite is a fabulous
choice for dormant fertilization.