Ferty® - Basis - For control of the pH-value

Product Formulation Application fields
FERTY® Basis 1 14+38(+5) soilless crops  - closed systems,  for all water qualities
FERTY® Basis 2 3+15+35(+5) for soil and substrate crops, ebb-flood systems, closed systems; for all water qualities 
FERTY® Basis 3 11+39(+4) closed system crops; irrigation watr causing pH problems
FERTY® Basis 4 4+8+40(+4) soilless vegetable growing
FERTY® Basis 5 5+20+30(+5) Crops needing a balanced NPH-ratio (e.g. bed and balcony plants)
FERTY® Basis 6 6+14+37(+4) soilless cultures needing les sulphate
FERTY® Basis 7 4+16+32(+6) Azales cultures

What is the advantage of the FERTY ® BASIS FERTILIZER and how is the working principle?

Growers use the FERTY® BASIS fertilizers whenever they have to solve the following problems: The carbonate hardness of the watering water is too high (well-water or tap water), too low (rainwater) or varying. These problems have an effect on the pH-value mainly in closed systems, where an undesirable concentration of ions could arise and in soil-less systems. There is no buffering through the substrates in soil-less systems, so that even a small difference from the optimum has a negative effect. As you can also change the N:K- ratio when using our Basis fertilizers, this product line offers several advantages at the same time.

Our Basis fertilizers are special fertilizers without or with only little nitrogen. Therefore they must always be supplemented by a nitrogen compound. The selection of the suitable nitrogen compound depends on the carbonate hardness of the water used.

- When using water without or with a low carbonate hardness (e.g. rain water) calcium nitrate should be added, because the nitrogen compound there exists almost completely as nitrate nitrogen which increases the pH-value. The calcium compound of the calcium nitrate ensures Ca-supply of the plants. When using waters with a higher carbonate hardness, the Ca-supply is ensured through the watering water.

- When there is a medium carbonate hardness of the water, you can see ammonium nitrate. This raw material contains ammonium nitrogen and nitrate nitrogen, at which the ammonium part has a stronger effect.

- Sometimes (e.g. with well-water), although very seldom, the carbonate hardness is very high, so that you must use the N-compound in the form of ammonium sulphate. It reduces the pH-value so extremely that you have to control it permanently in order to be able to interfere on time when necessary.

It is important for the grower to know the carbonate hardness of his watering water. The carbonate hardness is a part of the total water hardness, i.e. the part of Ca- and Mg-hydrogen carbonate ( measureing unit: ° KH or mmol/l acid capacity).

Too high part of hydrogen carbonate ( HCO3- ) during a longer period of time results in the increase of the pH-value in the cultures while the lack of carbonate hardness leads to a reduction of the pH-value. You can avoid this by adding the suitable form of nitrogen. When plants absorb ammonium ions ( NH4+ ), protons are set free. The positive charge of the protons leads to the reduction of the pH-value ( acid effect). When nitrate ions ( NO3-) are absorbed by the plants, hydrogen carbonate is formed, which has an alkaline effect. But as a part of it is absorbed again by the plants, the alkaline effect of the NO3- is not as strong as the acid effect of the NH4+.

When applying BASIS fertilizers, please mind the folllowing:
  • The quality of the watering water (carbonate hardness, respectively the acid capacity, Ca-content) must be known
  • The pH-value of the nutrien solution, respectively of the substrate must be observed permantently. Recommandation: Carry out analyses every 6-8 weeks.
  • As it is biological control of the pH-value, which needs a certain amount of time, a regular observation of the development of the pH-value and a timely reactionis necessary.
  • Concentrated (stock) solutions of BASIC fertilizers and of calcium nitrate should always be prepared seperately. Otherwise: precipitation; only diluted solutions should be mixed.
Conversion Table:

1 mmol/l = 1000 µmol/l
1 µmol/l = 0,001 mmol/l

Acid Capacity :

1 mmol/l = 2,804° KH (carbonate hardness)
1° KH = 0,357 mmol/l (acid capacity)

The principle of the basis - fertilizers was developed by Planta in cooperation with experimental stations in the year 1983.