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Cabbage - Growth retardation
Symptoms
With nitrogen deficiency the foliage becomes yellowish-green (chlorotic). The symptoms start from the older leaves and after a while the whole plant becomes chlorotic, some leaf parts may have a reddish or orange flush.
The shape of the leaves remains normal.
Growth is strongly restricted, crop development is delayed and older leaves may decay.
With severe N deficiency, no head is formed.
Reasons
Nitrogen deficiency on cabbage (right)
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
- High and early yields, good leaf size and market quality