Long-range weather forecasters aren't seeing storm-clouds forming
on the horizon. In fact, the latest projection from the National
Oceanic and Atmospheric Administration (NOAA) is for a severe
drought across most of the south and upper mid-west sections
of the U.S. Homeowners, armed with this forecast and knowledge
of proper preparations and practices can greatly improve the
chances of their home lawn surviving, even with very limited
water.
The Lawn Institute and Turf Resource Center, not-for-profit
groups in suburban Chicago has jointly assembled the following
tips to manage turf during a drought.
1. Reduce or eliminate nitrogen fertilizer because at this time
of year it overly promotes leaf growth, at the cost of rooting
activity. Plan on fertilizing in the fall when top growth slows-down
and root growth increases.
2. Avoid all weed killers (herbicides) because most can also
lessen the vigor of grass roots, the last thing you want to do
prior to or during a drought.
3. Reduce thatch and compaction as early in the
year as possible so that moisture and air can reach the roots
as easily as possible.
Thatch can act like a sponge, capturing water before it reaches
roots while compaction will increase rapid run-off at the cost
of deep saturation.
4. Sharpen the mower blade several times during
the turf-growing season because dull blades shred rather than
cleanly cut grass
and shredded turf can greatly increase water losses.
5. Mow less
or when it's cooler because no matter how you cut it, grasses
lose moisture after every mowing. Less
plant moisture
will be lost when mowing takes place at cooler times of the
day.
6. Mow as high as possible to promote deep rooting
and maximize soil shading. Although studies have shown that taller
grasses
can use more water, there is a greater benefit to deep roots
and reduced soil moisture loss from evaporation.
7. Leave clippings, not clumps to add moisture,
nutrients and a mulching effect; however, remove clumps because
they will
block the sun and heat up as they decay, killing the under-lying
grass.
a.
water late at night or early morning to take advantage of cooler
temperatures and less evaporative losses
to the afternoon
winds and hot sun
b.
water infrequently and deeply to encourage roots to go deeper
where moisture remains available for longer
periods of time.
c.
let the grass go dormant naturally by withholding water, except
for a quarter-inch every four
to six
weeks to keep
the vital
grass crowns hydrated and capable of greening up
when temperatures cool and moisture is again available.
9. Reduce traffic on the lawn at all times if possible, but
especially during the heat of the day when foot traffic and even
lawn mowers can injure the grass plants and cause almost immediate
dehydration.
When cooler, wetter weather returns you can help your lawn recover
from a drought by watering deeply. This will wash dust off the
leaves, re-hydrate the dormant crowns and initiate root growth.
Heavy traffic should be avoided on recently watered lawns at
this greatly increases compaction.