Bihrmann's   CAUDICIFORMS   

 Water   Watering   Nutrition  pH   Light   Ventilation  Temp.   Soil   Pots   Pruning   Rest

While out plants grow, they need nutrition. They might get some from the soil, but in the long run, they need more. It is a balance, and in general; less is better.
While the plants might grow slow with too little fertilizer, they can be killed with too much: The roots die or specific processes can't function in the plant. To judge wherever the plant get too much or too little can be a bit tricky. Both will give a discolouration of the leaves. And which mineral is lacking? Well, a change of Soil is the easiest quick-fix.
The plants are build by 17 minerals and gasses. The latter is easily acquired, but we have to add the minerals.
The nutrition is divided into two groups: The macros: Carbon: C 450.000ppm, Oxygen: O 450.000ppm, Hydrogen: H 60.000ppm, Nitrogen: N15.000 ppm, Potassium: K10.000ppm, Calcium: Ca 5.000ppm, Phosphor: P 2.000ppm, Magnesium: Mg 2.000ppm, Sulfur: S 1.000ppm. The Micros: Chlorine: Cl 100ppm, Iron: Fe 100ppm, Mangan: Mn 50ppm, Bohrium: B 20ppm, Zink: Z 20ppm, Cupper: Cu 6ppm, Molybdenum: Mo 0,1 ppm, Silicon: Si is only used by some like the grasses.
The amount needed is species specificated, but lie in general within the tolerance for most plants. That said, carnivorous plants, epiphytes and other plants growing in poor environments can't stand high values.

The right fertilizer depends on the plant species and other growing parameters - and your personal liking. Personally, I would prefer fermented cow-dung, giving the plants a bit of everything through time.
Actually, I use some mixed chemicals, consisting of specific chemical connections which allow the roots to absolve the atoms. It is way more easy to control and mix in the right amounts - or simply buy pre-mixed.

If you want your plants to add in size, you should keep the amount of nutrition high. Average plants will benefit from levels around 0,5 and 1,5 μS. As mention on
Water, the more pure your basic water is, the more nutrition you can add.
As the roots adjust to specific conductivity, they do benefit from a rather constant level. It is better to add fertiliser often, than to give them a lot at one time.
Another way is to use some slowly de-composting fertilizer, which will feed the plants through time. It is harder to control, but works fine in general, as the levels change slowly.
The level of nutrition might change through the year, giving the plants more in the growing period. Not that is changes much in the wild, except the moisture amplify the de-composition of dead material.

Measuring the level in the soil can be a bit tricky, especially if you use a gravel-like soil. Water the pot from the top for once, and measure the wash-out. Else; take some soil from the middle of the pot, and press out the water for a test. Use a conductivity-meter, which is affordable.
Considering the evaporation to the air leave minerals in the soil, along with the minerals the plant don't soak up, the soil might be more and more rich - although not by something the plant appreciate. That can, like a poor soil call for a change of Soil. Other left-over might change the pH as well, and that is a problem as well. The plants are only able to obtain specific nutrition at particular pH levels.

Binding the nutrition in the soil woll be taken up in Soil.

 Water   Watering  Nutrition   pH   Light   Ventilation  Temp.   Soil   Pots   Pruning   Rest