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Beans - Growth retardation
Symptoms
Older leaves turn pale green to yellow first. Leaflets often downward pointing.
Growth is stunted. Premature senescence of older leaves occurs as deficiency continues
Reasons
Nitrogen deficiency (right)
Nitrogen undersupply occurs easily in sandy soils with low organic matter. Too low as well as too high soil pH can restrict its availibility. Heavy rain or irrigation may induce N deficiency caused by leaching or anaerob conditions, suppressing N-fixing bacteria.
Nitrogen deficiency vs. healthy plant 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
- Lusher greener growth
- Healthy root growth
- Improved protein content in peas