Frequently Asked Questions

Why are manvert K-fruit or manvert potassium better than other products with similar or greater concentration?

Most liquid solutions with high potassium content, containing more than 20% K2O, contain hydroxide or potassium carbonate in their formulation, causing water pH to increase to very high values (pH over 12).

The application of these high pH products on plants incurs the risk of phytotoxicity on the leaves, since the pH of the sprayed mixture exceeds 10 at recommended application dosage.

In order to avoid this risk manvert K-fruit and manvert potassium contain ingredients in their formulation which reduce the pH of the solution when dissolved in water, creating a buffer effect which allows foliar application of the product with a pH in the pulverised mixture between 6 and 7, while also ensuring optimal compatibility with different products that are applied simultaneously.

What is the difference between a product complexed with lignosulfonic acid and amino acids?

Both amino acids and lignosulfonic acid are considered to be complexing agents. The differences that can be observed between them are:

  • Amino acids can complex a lower concentration of metal compared to lignosulfonic acid.
  • Complexing mechanisms are different depending on whether we are dealing with an amino acid or a lignosulfonic acid, since if the product is formulated with lignosulfonic acid this provides further structural strength to the leaf that amino acids do not provide.

Both options are valid, however concentrated products complexed with lignosulfonic acid are normally preferred.

From the point of view of stability, products formulated with lignosulfonic acid are more stable than those using amino acids since they contain other functional groups which interact in solution, while amino acids not have this capability.

Why complexing and chelating agents?

The difference between a chelating agent and complexing agent is due to the origin. A chelating agent exists exclusively after chemical synthesis process, while a complexing agent can be chemically manipulated, however it exists in its original form in nature.

In many cases the chelating agent is specific for a metal, for example EDDHA for Iron (Fe), while complexing agents are more general.


What is the advantage to our calcium-boron?

Products having calcium-boron in liquid form suffer from several problems: The low solubility of boron in water and instability in acidic media. That is why our product contain ethanolamines which complex with the boron and make it more soluble. It should be noted that in acidic medium the complex breaks down, which is why calcium precipitates at high pH levels.

This is why many of the products found on the market have boron sediment in the bottom of the container.

For this reason when boron is to be used this should be in a soluble form and must be complexed, however consideration should be given to the medium, which must not be too alkaline. The optimum pH of the product should be less than 9.

In order to obtain a product with a high concentration of calcium and boron and with an optimum pH and without precipitation, Biovert, SL has developed manvert CaB-Tracker. This product is formulated from an organic molecule reacting with a calcium salt and a boron salt to form a natural organic complex incorporating both elements in its chemical structure. This compound is highly soluble in water and it permits adjustment of the pH in pulverisation water to the optimum level for perfect uptake by the plant.

The structure of the product assists with the assimilation and transportation of calcium and boron in the plant.

Moreover, this organic molecule (base of the formulation) passes through the Krebs Cycle, improving breathing and plant photosynthesis.

What is the difference between manvert Liberoxi and potassium nitrate used in fertigation?

To make the comparison of these products it is necessary to analyse different aspects:

Ability to release oxygen
Potassium nitrate has no ability to release oxygen under “normal” operating conditions, while our product does have this capacity because it is formulated with different ingredients to potassium nitrate.

Oxygen generation process
This is a process of decomposition of the ingredients, which results in the formation of atomic oxygen (O), which quickly turns into the naturally stable form, O2.
The oxygen generation process has nothing to do with the denitrification process, since this would probably generate ammonium, but no free oxygen. In addition, denitrification under reducing conditions within the medium could kill the plant through asphyxiation, preventing the assimilation of other nutrients.

Quantity of oxygen formed per kg of Liberoxi
50 ± 5% g of O2 is formed per Kg of manvert Liberoxi.

Measurement of oxygen released
This cannot be measured directly for the formulated product, it is measured on the active ingredient according to its specification.