Glycine max Yellow Leaves - Causes & Fixes

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Nitrogen Deficiency

Nitrogen is highly mobile; when deficient, the plant moves nutrients from older leaves to new growth, causing chlorosis starting at the bottom of the plant. In soybeans, this manifests as a uniform yellowing of older, lower leaves.

Very Common

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How to confirm: Check if the yellowing started on the oldest leaves at the base of the stem and move upwards.

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shopping_cart Recommended Products

1 Apply a nitrogen-rich organic fertilizer to replenish the soil nutrients and stop the chlorosis from spreading to new growth.

Back to the Roots Blood Meal & Gypsum (4 Pack)

Organic Fertilizer

$40

Out of Stock

2 Incorporate organic matter like worm castings into the soil to provide a slow-release source of nitrogen and improve soil health.

Back to the Roots Organic Worm Castings 5lb

Worm Castings

$17

In Stock

3 Monitor soil moisture levels using a moisture meter to ensure nitrogen is being effectively transported to the roots without causing waterlogging.

GROWIT Soil Moisture Meter - Blue

Water Meters

$12

In Stock

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Water Stress (Drought or Waterlogging)

Soybeans are sensitive to moisture extremes. Drought causes wilting and yellowing due to stomatal closure, while waterlogged soils cause anaerobic conditions that lead to root rot and nutrient lockout.

Very Common

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How to confirm: Inspect the soil moisture level and check for signs of standing water or compacted, muddy soil near the roots.

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shopping_cart Recommended Products

1 Check the soil moisture level at the root zone using a moisture meter to determine if the plant is suffering from drought or waterlogging.

GROWIT Soil Moisture Meter - Blue

Water Meters

$12

In Stock

2 If the soil is bone dry, implement a consistent watering schedule; if the soil is saturated, improve drainage by adding horticultural perlite to the soil mix.

3 Apply a liquid seaweed fertilizer to help the plant recover from environmental stress and boost nutrient uptake.

FoxFarm Bush Doctor Kelp Me Kelp You Liquid Seaweed Fertilizer 1 Quart

0.9 L • 1 pcs

$32

In Stock

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Sulfur Deficiency

Unlike nitrogen deficiency, sulfur deficiency often shows up first in the newer, upper leaves because sulfur is less mobile within the soybean plant. This leads to interveinal chlorosis on top growth.

Common

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How to confirm: Observe if the yellowing is appearing on the youngest, topmost leaves of the soybean canopy.

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shopping_cart Recommended Products

1 Apply a sulfur-rich organic soil amendment to the base of the plant to replenish the soil nutrients.

Coast of Maine Quoddy Blend Lobster & Crab Compost

28.3 L • Compost Blend

$25

In Stock

2 Monitor the soil moisture levels using a moisture meter to ensure the sulfur remains available and does not leach away due to overwatering.

GROWIT Soil Moisture Meter - Blue

Water Meters

$12

In Stock

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Iron Chlorosis (pH Imbalance)

If the soil pH is too high (alkaline), iron becomes unavailable to the soybean roots. This results in bright yellow leaves with distinct green veins (interveinal chlorosis).

Common

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How to confirm: Perform a soil test to check if the pH level is above 7.0.

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shopping_cart Recommended Products

1 Test your soil pH immediately to confirm if levels are above 7.0, as high alkalinity is preventing iron uptake.