Sulphur deficiency resembles nitrogen deficiency, but at the top of the plant. Because sulphur is not mobile, the deficiency is first observed in the younger leaves. These turn pale green, while the petioles get a strong purple tint. The leaf tips can curl up. If several leaves start to fade, the colour changes from light green to deep yellow. In case of a serious deficiency, flowering and growth are inhibited. A lack of sulphur can lead to a lower yield and poor quality of the end product.
How do you recognise a sulphur deficiency?
- Greening of the younger leaves.
- Leaf stems get a purple tint.
- The veins will start yellowing.
- Leaf tips may curl up.
- In case of serious deficiency flowering and growth are inhibited.
- The pH level of the soil or substrate is too high.
- Incorrect composition of nutrients.