Page 14—Corn Talk, Lancaster Farming, Saturday, October 11, 1997
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EARLY SEASON
CHLOROPHYLL METER
NITROGEN TEST
FOR CORN
Doug Beegle and Dwight
Lingenfelter
Penn State
The chlorophyll meter is a
portable, hand-held device that
instantaneously measures the
greenness (or chlorophyll con
tent) of a plant in the field.
Nitrogen (N) is closely asso
ciated with leaf chlorophyll;
thus chlorophyll meter read
ings of com leaves reveal the N
status of the plants.
The early-season chloro
phyll meter test consists of tak
ing meter readings of com
leaves when plants are between
the six- and the eight-leaf
stages (when plants are about
10 to 20 inches tall), which
allows time to sidedress if
necessary.
Meter readings taken from
plants in a field are compared
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CORN TALK NEWS
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/h PENNSYLVANIA MASTER
to readings taken from high N
reference plots that have been
adequately fertilized with N
fertilizer. Additional N is
required for optimum com
yield if the average meter read
ing of the Held is less than 95
percent of the high N reference
value. An N fertilizer estimate
can be calculated using meter
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readings and field factors.
Advantages of the early
season chlorophyll meter test:
•Chlorophyll meter readings
are quick, easy and provide
instantaneous values.
• No samples need to be col
lected, processed, and sent to a
laboratory for analysis.
• Cost of sampling involves
only labor costs.
• N recommendations are
accurate (comparable to the
Pre-sidedress Soil Nitrate
Test).
Disadvantages of the early
season chlorophyll meter test:
• Initial expense is high (the
meter costs about $1,400).
• Early-season corn leaf
chlorophyll levels are affected
by hybrid selection and envir
onmental stresses; therefore,
high N reference plots must be
established.
• This test is not applicable
to fields that have received a
preplant or an at-plant N fertil
izer application beyond starter
S' !
Ilhu
mr
1. 1 IMmL.
This test provides another
option in addition to the
already widely used preside
dress soil nitrate test for com
(PSNT) for assessing nitrogen
status of the com crop and
making economically and
environmentally sound N
recommendations. Both tests
appear to give similar results.
This test has been studied
extensively in Dr. Richard
Fox’s research program here at
Penn State and at other
research centers. Also, we con
ducted an extensive three year
I
(D®l3M fiJLE WWm
PENNSYLVANIA MASTER CORN GROWERS ASSOC., INC.
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in your future
tail ii'
1248 SOUTH MOUNTAIN RD.. DILLSBURG, PA 17019
field evaluation of the test
involving county agents, crop
consultants, and fertilizer deal
ers who used the test under
actual farm conditions. On that
basis, we are now recommend
ing that the early season chlor
ophyll meter nitrogen test for
com can be used as a nitrogen
management tool in
Pennsylvania.
A new Agronomy Fact sheet
#53 “The Early-Season Chlor
ophyll Meter Test for Com”
has been published which
gives all of the details on this
new test.
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