Soybean
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Soybean - Growth retardation
Symptoms
Leaves usually show a dark green to bluish tint. The displayed photo shows yellow chlorosis.
Because of the effect that P deficiency has on retarding overall growth, striking foliar symptoms that are evidence
of deficiency in certain other nutrients, for example N and K, are sometimes observed.
Reasons
Phosphorus deficiency
The uptake of P is inhibited in acidic as well as in cool, wet soils.
Phosphorus deficiency made worse by
- Acidic or very alkaline (calcareaus) soils
- Low organic matter
- Cold or wet conditions
- Crops with a poorly developed root system
- Soils with low P reserves
- Soils with a high phosphate capacity
- Iron rich soils
Phosphorus is important for
- Increased energy transfer
- Improved synthesis of proteins
- Greater formation of nucleic acids
- Stronger cell membranes due to increase in phospholipids