C4o—Lancaster Farming, Saturday, March 29,1980
Do your crops need Manganese?
NEWARK, Del. - High
prices and narrow profit
margins are forcmg growers
to consider every aspect of
fertility management to get
the best return on in
vestment. One aspect of
fertility management which
concerns many farmers is
the possibility of
micronutrient deficiency.
In Delaware, the most
commonly observed
micronutrient found
deficient is manganese,
especially in soybeans and
occasionally in com.
Managanese deficiency
usually occurs on high pH
soils and is usually
associated with over-liming,
says University of Delaware
extension soils specialist Leo
Cotnoir.
It is seldom observed at
soil pH values under 5.8,
becomes more prevalent at
pH 6.0, and most often is
found at soil pH values over
6.5. This is especially so on
sandy soil. At pH 6.0, for
example, manganese
deficiency is much more
likely to occur on a loamy
md than on a silt loam.
One of the best ways of
preventing manganese
deficiency is to monitor soil
pH carefully and avoid over
liming.
Sheep numbers down,
early crop up
LANCASTER - The
number of sheep and lambs
on feed in seven selected
States on March 1, 1980
totaled 597 thousand head,
down one percent from the
604 thousand head on feed a
year ago.
There were 287 thousand
placed on feed during
January and February this
year, down 6 percent from
the 306 thousand placed
during the same period of
1979.
Of the total number of feed
March 1, 1980, in the seven
States: 9 percent weighed
less than 70 pounds, 7 per
cent weighed 70 to 79 pounds,
14 percent weighed 80 to 89
pounds, 28 percent weighed
90 to 99 pounds, 44 percent
weighed 100 pounds and
over
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Loamy sand soils should
not be limited than 6.2
while silt loams should be
kept at around 6.3 to 6 5
This may be a problem on
loamy sands, where a ton of
lime (often considered the
lowest amount that can
feasibly be applied) may get
soil pH values over 6.2.
On soils with known
histones of manganese
deficiency, lime applications
of less than one ton should be
considered, says the
specialist.
Manganese deficiency m
soybeans is rather easily
recognized. The new growth
turns yellow. Only m ex
treme cases will entire
plants be yellow. In many
instances, mild manganese
deficiency symptoms will
disappear as the roots reach
more acid subsoil. In corn,
manganese deficiency
generally results in an
overall bght green color.
The most effective way of
correcting manganese
deficiencies is by the use of
foliar sprays.
One to two pounds of ac
tual manganese as
manganous sulfate in 20
gallons of water applied
when deficiency symptoms
are first observed is very
effective. A second spray
application two or three
The early lamb crop in
California, Kansas and
Texas totaled 1.44 million
head, up one percent from a
year ago. The January 1
inventory of ewes one year
old and older for these States
was up less than one percent.
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weeks later may be needed.
Some burn may occur if the
spray is applied in mid-day
but it is seldom serious.
The most effective method
of application is as a band.
This requires 8 to 10 pounds
of actual manganese per
acre. As the deficiency
results from soil conditions
which convert manganese to
unavailable forms rather
than from an actual lack of
total manganese, broadcast
applications are the least
effective way of applymg
this nutrient.
When broadcast,
manganese must be applied
at the rate of at least 40
pounds per acre. Even this
rate may not be very ef
fective on high pH sods. It
will not “carry-over” and
will need to be repeated
yearly.
In cases of mild
deficiency, banding of an
acid fertilizer may be
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beneficial. Fertilizers for
mulated with ammonium
sulfate provide enough soil
acidity in the vicinity of the
roots to convert unavailable
manganese to the available
form.
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Davidsburg 4-H Club
DOVER - The March
meeting of the Davidsburg 4-
H Club was held recently.
The Club will clean up
assigned roads on April 26.
Junior Fun Night will be
April 11, 7 p.m. - 9.30 p.m.
The club will be constructing
an obstacle course at
Paradise Elementary’s
SALES AND SERVICE
Yield
Bulletin
Spring Spree, May 17, 3 p.m.
- 7 p.m. Also, the club is in
charge of the baked good'll
stand at the 4-H Auction, J
March 28, 6 p.m., at the 4-H
Center at Bair. Preparations
should be made for the May
talent show.
The next meeting will be
April 17.
Phone:7l7-786-7318
3