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International Field Facts

CORN PLANTING DEPTH AND STAND ESTABLISHMENT

Proper corn seed planting depth is critical for optimum root and plant development. Shallow planted corn
can delay or inhibit nodal root (brace root) development, which are the primary roots for water and nutrient uptake.

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STAGING CORN GROWTH

Growth stages of corn are divided into vegetative stages (V) and reproductive stages (R) as outlined in Table 1.
Subdivisions of the V stages are designated numerically as V1, V2, V3, etc. through V(n), where (n) represents
the last leaf stage before VT for the specific hybrid under consideration.

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CONDITIONS AT POLLINATION DETERMINE KERNEL SET IN CORN

Because of its impact on kernel number and final yield, the pollination process is one of the most critical periods
in the development of the corn plant. While number of kernel positions is determined earlier in the corn plant's
development, number of kernels actually set is largely determined near the time of pollination.

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PLANTER ADJUSTMENT TIPS FOR LARGER CORN SEED SIZES

Corn seed size is influenced by both genetics and the environment. Seed parents may be intrinsically small- medium-,
or large-seeded; thus, even when growing conditions are similar, seed parents differ from each other in the seed size they produce.

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UNDERSTANDING PURPLE CORN AND UNEVEN SEEDLING GROWTH

When corn plants emerge, it's not uncommon for seedlings to have a purplish tint or some uneven early growth. These observations
often worry some corn growers. However, when the purple color disappears -usually after the six-leaf stage - so do growers’ concerns.

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MANAGING CORN FOR GREATER YIELD

Improved hybrids and production practices are helping corn growers increase yields. Over the past 20 years, U.S. corn yields
have increased by an average of 1.8 bu/acre per year.

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2011 CORN ROOT LODGING

Corn root lodging is a significant problem in 2011. There are numerous concerns regarding the impact of root lodging on yield and
harvest efficiency. This fact sheet helps explain the causes of root lodging and provides some management suggestions for dealing
with the root lodging issue.

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