At what stage does the growing point first come above ground in corn?
A. V1
B. V3
C. V6
D. V12 - C. V6
When staging corn a leaf (or node) is counted when what is visible
A. collar
B. leaf
C. sheath
D. blade - A. collar
The first root coming from the seed is called the
A. crown root
B. radical
C. seminal root
D. coleoptiles - B. radical
The structure that elongates to cause emergence in corn is the
A. coleoptiles
B. mesocotyl
C. radical
D. plumule - B. mesocotyl
One major reason to stage corn plants is to know when to apply
A. herbicides
, B. insecticides
C. dry fertilizer
D. all of these - A. herbicides
If a producer's corn was damaged by hail ( was cut off at ground level ) at V8, the producer should
A. do nothing, it will grow back
B. consider replanting if early enough in the season because there will be no regrowth
C. chop the corn for silage
D. plant a longer season variety - B. consider replanting if early enough in the season because there will
be no regrowth
Which fertilizer nutrient is normally applied in the highest amount of actual nutrient
A. nitrogen
B. potassium
C. phosphorus
D. sulfur - A. nitrogen
If producers have a low pH in their soil they should apply
A. gypsum
B. lime
C. sulfur
D. iron - B. lime
According to the ISU publication Regional Nitrogen Guidelines for Corn, the corn yield goal should be
multiplied by what number to determine the amount of nitrogen to be applied.
A. 0.8
B 1.2
C. 1.4
D. 2.0 - B. 1.2
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