Soybean
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Soybean - Chlorosis
Symptoms
Yellowgreen, uniform discoloration of foliage.
Older, lower leaves are affected first.
Plant growth is stunted.
Reasons
Nitrogen deficiency
Nitrogen deficiency made worse by
- Low or high pH soils
- Sandy or light soils (leaching
- ) Low organic matter
- Drought conditions
- High rainfall (leaching) or heavy irrigation
- Addition or high levels of non-decomposed organic matter/manure (eg straw)
- Fast growing crops
Nitrogen is important for
- Better synthesis of amino acids
- Improved formulation of co-enzymes and nucleric acids
- Increased synthesis of chlorophyll and ATP