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 The radicle, which becomes the main root of the soybean
seed, is the
first part to emerge once the seed has taken in sufficient water.- After radicle emerges, the hypocotyl begins to elongate and it forms
an arch, which pushes up through the soil.
- As the arch breaks through
the soil surface it straightens in response
to sunlight striking it on top and pulls the cotyledons upward
and
free of the soil.
- Upon exposure to sunlight, the upright cotyledons turn green in the
light, and begin to open.
- The 2 unifoliolate leaves expand above
the unfolding cotyledons.
- The first trifoliolate leaf appears
above the unifoliolate leaves.
- Food stored in the cotyledons is the
main nutrient source for about a
week after emergence.
- By the time the cotyledons drop off, the seedling
is capable of
supporting itself by photosynthesis.
- VE refers to plant emergence
and VC refers to the cotyledon stage.
Leaf stage designation (V1,V2, etc.) refers to the number of
unrolled
trifoliolate leaves.The picture below shows a V1 soybean.
- The
first nodules are present about one week after seedling emergence.
10 to 14 days later, the nodule bacteria are able to supply most
of the plant’s nitrogen requirement.Active nodules are
pink inside.
- If the soybean plant is broken off or killed back
below the lower-most
dormant bud, regrowth is impossible.
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