A boron deficiency is recognisable by discolouration of the younger leaves. You’ll also see a rust-coloured deposit on the crop. New leaves seem to have their ends burned. A lack of boron also renders the crop fragile. Roots are also vulnerable to boron deficiency: their growth will lag behind.
How do you recognise a boron deficiency?
- Rusty deposits on the younger leaves.
- New leaves seem burned, thick and brittle.
- The crop will be fragile.
- Brown spots on the crop.
- Twisted leaves.
What is the (possible) cause?
- The soil or substrate has been in use for too long.
- The pH value of the soil or substrate is too high.
- The root environment is too dry.
- Incorrect nutrition.
- Boron is easily soluble. This means it can easily be washed out of the soil.