This document describes the symptoms of various nutrient deficiencies in soybean plants. Symptoms include pale or yellow leaves, interveinal chlorosis or necrosis, and stunted growth. Specific deficiencies mentioned are magnesium, phosphorus, potassium, iron, manganese, and nitrogen, each with their own characteristic leaf color patterns and progression of symptoms. The document provides visual examples of how each nutrient deficiency appears in soybean plants.

3. Symptoms
 Pale green plants, pale
yellow leading to brown
older leaves, veins are
not prominent.

4. Symptoms
 Dark green to bluish
green leaves, often with
interveinal, small
lesions; drybean may
have marginal chlorosis.

5. Symptoms
 Green plants with
chlorosis along the leaf
margins - leading to
brown interveinal
necrosis in soybean;
veins stay green.

6. Symptoms
 Soybean typically requires
large amounts of potassium.
Like phosphorus deficiency,
potassium deficiency occurs
first on older leaves.
Symptoms are chlorosis at the
leaf margins and between the
veins. In severe cases, all but
the very youngest leaves may
show symptoms.


7.  Pale green to yellow
leaflets without
prominent veins or
necrosis.

8. Symptoms
 Pale green plants with
interveinal pale yellow
mottling of the leaves
followed by interveinal
necrosis - or necrosis
along the underside of
the main veins in
drybean.

9. Symptoms
 Pale green plants;
interveinal mottling (or
interveinal chlorosis in
drybean) of older leaves
leading to bronze
necrosis; green veins.

10.  Symptoms are
prominent interveinal
chlorosis or necrosis;
veins are prominent over
length of leaf.

11. symptoms
 Iron chlorosis in
soybeans. The upper
leaves become chlorotic.

12. Symptoms
 Pale yellow leaves with
mottled interveinal
chlorosis leading to dark
brown necrosis.

13. Symptoms
 Stunted plants with
interveinal chlorosis. Can be
a problem in soils with high
pH (>7), or on soils that are
sandy or with a high organic
matter content. Manganese
activates enzymes which are
important in photosynthesis,
as well as nitrogen
metabolism and synthesis.
Symptoms are hard to
distinguish from iron
chlorosis.

14. Symptoms
 Plants turn a light green
color due to lack of
nitrogen fixation. This
deficiency is not
common, but can occur
on acidic, highly
weathered soils.