When fertilizing, all kinds of mistakes can happen.
A main mistake is the imbalance caused by adding an excess of certain ions (salts).
The colloids (buffers) largely correct this mistake by absorbing many of these ions. They thus disappear from the soil moisture, protecting it from excess salts.
This excess would negatively affect the cell fluid of the root hairs. Due to the higher ion concentration outside the cell, the water inside the cell fluid would be withdrawn (osmotic balance).
This would continue until a balance of salts inside and outside the cell is reached. This withdrawal of water is also called “burning of the plant or leaf.”
Cheaper fertilizers contain many salts that almost always only partially provide plant nutrition.
These salts, also called “fillers,” can cause a plant to burn earlier as they continue to accumulate in the medium.
This potting soil then usually cannot be reused and must therefore often be replaced after one use.
In addition to lower yields, cheaper fertilizers also cost much more labor and money when renewing the medium.
A soil or coco medium that is properly buffered after each harvest can last for many years. Special buffer nutrients balance and stabilize the pH in the medium again.
A good soil buffer also contains a mix of beneficial soil bacteria to stimulate life in the potting soil.
At least 5 days before harvest, no NPK nutrients should be added to the medium.