Rory Lewandowski, Extension Educator Wayne County and Crossroads EERA
Every
Monday for the past couple of months on the OSU Extension crop team conference
call I have heard Jim Noel from the National Weather Service say that across
Ohio we are in a pattern of above average temperatures and below average
rainfall. These are not encouraging
words for a grazier to hear. This isn’t
the type of forecast conducive to good pasture growth. Summer pasture growth is dependent upon
rainfall and pasture management.
Rainfall we can’t control.
Management though is a different story.
So what’s your plan to manage through a hot, dry summer?
Regardless
of the weather pattern, you should stick to what you know as a grazier, as a
manager of pasture plants. Those pasture
management principles that you learned at a grazing school, or through a
grazing council, or from an experienced grazier will serve you in good stead
through this weather pattern. Let’s
review those principles and how they are applied when it is hot and dry.
The take
half, leave half principle must be followed during the summer months. That remaining leaf area provides a
photosynthetic base for plant regrowth, shades the soil to keep the soil
temperature cooler, and it helps to reduce soil moisture loss. Do not cheat on this principle during hot,
dry spells. It is critical to maintain a
4 inch grass height to get the benefits mentioned. Maintaining this leaf
residue provides the grass plant the best opportunity to take advantage of
those spotty rain events that are common to hot, dry years, allowing regrow
much sooner than overgrazed pasture paddocks.
The second principle that must be
adhered to is to provide a rest period that is sufficient to allow plants to
grow back to a practical grazing height.
The height at which grazing should begin is somewhere in the 8 to 10
inch range. Obviously the two principles
work hand in hand. In practice this
means that grazing rotations slow down during hot, dry periods. It is easy to do just the opposite.
Grass is growing slowly. In order to maintain a 4 inch residual I move
my livestock into the next paddock a little early. Maybe the grass is only 7 inches tall. If I want to maintain a 4 inch residue, I’ll
have to leave this paddock a little sooner than the time my livestock can
normally graze in this paddock. The
grass in my next scheduled paddock is only 6 inches tall. Maybe I should just let them graze this
current paddock down a little bit lower, say 3 inches. This pattern continues and soon I am either
grazing down to a 2 inch height, which pretty much stops regrowth during 90
degree days with no rainfall, or I am trying to get my livestock to only take
off an inch or two of grass growth, which is pretty tough to do. The end result is that paddock moves are
speeding up and leaving behind paddocks that are overgrazed. The next rotation puts me in even worst
shape.
What’s the answer? Stick to what you know. Maintain a leaf residue of about 4 inches and
do not start a grazing pass unless the paddock is 8 to 10 inches tall. Impossible!
The grass is not growing fast enough.
Yes, I know. That means you must
have a sacrifice area in order to maintain these grazing principles and protect
the majority of your pasture paddocks.
The sacrifice area might be a barnyard lot or maybe it is a pasture
paddock. If it is a pasture paddock it
will get overgrazed and beat into the dirt while you wait for sufficient
pasture growth to resume your grazing rotation.
It means that hay will have to be fed.
While this is not a desirable
situation, a worse disaster is overgrazing every paddock, ending the grazing
season in July, negatively affecting next year’s grazing season, and facing an
extra-long period of hay feeding beginning in late summer. By sticking to what you know, and using a
sacrifice area, you make the best of a tough situation and put yourself in the
position to be able to resume grazing when rainfall starts again and
temperatures cool down. There is still
the possibility of stockpiling grass for late fall and winter grazing because
you have protected most of your grass plants.
Feeding some hay while in a sacrifice lot is really using hay as a
management tool. The end result will be
less total hay fed in the year if grazing is able to resume later in the summer
and throughout the fall. Feeding hay in
the summer in a dry lot beats feeding hay late in the fall or winter in cold
and/or muddy conditions. In some cases,
depending upon hay supply, and when rainfall might resume again, reducing
livestock numbers may have to be considered as well.
Finally, if the sacrifice lot must
be a pasture paddock, choose one where some renovation is needed and new
improved pasture varieties can be planted.
Ideally this might be a paddock where you could do some tillage after
your pasture rotation begins again. This
would provide the option to plant a late summer forage option such as a cereal
grain like oats, wheat or rye or a brassica like turnips. Any of these forages could provide some fall
and early winter grazing. The paddock
would then be set up for an early spring planting to return to a perennial
pasture mix.
Hot, dry summers are a challenge to
the grazier. Pasture management is the
only factor that can be controlled.
Stick to what you know as you make those management decisions.
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