Beans - Growth retardation
Symptoms
Growth is stunted and older leaves are redddish purple. Leaves have a dull green appearance. Leaves senesce prematurely starting from the base of the stem.
Reasons
Phosphorus deficiency (right)
P availibility is restricted below pH 6.2. However, sensitivity to low P levels varies among cultivars.
Beans - Growth retardation
Symptoms
Growth is severely stunted. Leaves show a dark green color, partly with irregular marginal chlorosis. Basal leaf exhibits interveinal chlorosis with dark discoloration. With ongoing deficiency older leaves die off prematurely.
Reasons
Phosphorus deficiency (right)
P availibility is restricted below pH 6.2. However, sensitivity to low P levels varies among cultivars.
Beans - Growth retardation
Symptoms
Growth is severely stunted. Leaves show a dark green color, partly with irregular marginal chlorosis. Basal leaf exhibits interveinal chlorosis with dark discoloration. With ongoing deficiency older leaves die off prematurely.
Reasons
Phosphorus deficiency
P availibility is restricted below pH 6.2. However, sensitivity to low P levels varies among cultivars.
Beans - Chlorosis
Symptoms
Growth is severely stunted. Leaves show a dark green color, partly with irregular marginal chlorosis. Basal leaf exhibits interveinal chlorosis with dark discoloration. With ongoing deficiency older leaves die off prematurely.
Reasons
Phosphorus deficiency
P availibility is restricted below pH 6.2. However, sensitivity to low P levels varies among cultivars.
Beans - Chlorosis
Symptoms
Growth is severely stunted. Leaves show a dark green color, partly with irregular marginal chlorosis. Basal leaf exhibits interveinal chlorosis with dark discoloration. With ongoing deficiency older leaves die off prematurely.
Reasons
Phosphorus deficiency
P availibility is restricted below pH 6.2. However, sensitivity to low P levels varies among cultivars.
Phosphorus deficiency vs. healthy plant 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
- Healthy green foliage
- Improved root development
- Increased yields
