How do you recognise a phosphorus deficiency?
- At first, a phosphorus deficiency will lead to a sudden growth stagnation.
- Next, you'll notice a dark green discolouration of the lower, older leaves. Red or purple colours may also appear.
- Root development will decrease.
- Leaf extension is reduced. The same goes for leaf surface and the amount of leaves.
- Shoot growth will decrease. Stalks become short and slender.
- The plant is less resistant to diseases.
- The quality of the yield is reduced.
What is the (possible) cause?
- Low phosphorus concentration in the soil or substrate.
- The substrate is too wet.
- The pH value of the soil or substrate is too low.
- The temperature in the soil or substrate is too low.
- A lack of oxygen in the soil can reduce the absorption of phosphorus.
How can you prevent it?
Prevention is better than cure. Therefore, choose a phosphorus rich potting soil to allow your plant to grow. The soil temperature is also important: keep this around 21°C. Use one of our basic nutrients (like Terra Grow
and Terra Bloom
) to reduce the likelihood of a deficiency. Also keep abiotic factors in mind. These include temperature, light intensity, acidity, amount of moisture and wind strength.
How can you cure it?
A fertiliser that contains a lot of phosphorus can help eliminate the deficiency. Bat manure like our Bat Guano
are an excellent choice for this. You can also use a liquid fertiliser like Green Sensation
or PK 13-14
. Another option is to flush your grow system with clean,pH-controlled water. This lowers the pH and EC values.
What does phosphorus do for the plant?
Phosphorus is a macro nutrient. This means that plants need it in large quantities to grow and thrive. Additionally, phosphorus plays a central role in the photosynthetic process and in the breathing of the plant. These two processes ensure that the plant has enough energy. Fast-growing plants use large amounts of phosphorus to produce flowers and fruits during the flowering phase.