Method for Making Highly Efficient, Low-Pollution, Slowly Nitrogen Releasing Organic Mineral Granular Fertilizers

The method, according to the preceding claim, wherein the natural organic nitrogen can derive from:

• dry blood, meat meal and other animal derivatives, such as for example feather meal, horn and nail residues, bone meal, casein, proteinic hydrolysates or their mixtures in all proportions.

The method, according to the preceding claim, wherein the condensates of the urea with aldehyde and be:

• urea-formaldehyde, crotonylidendiurea or isobutylidendiurea.

The method, according to one or more of the preceding claims, wherein drying can be realized with the spray-dry system (atomizer) with nozzles or turbine.

The method, according to one or more of the preceding claims, wherein drying can be realized in a granulation rotating drum.

The method, according to one or more of the preceding claims comprising a compressing and/or pelletizing step.

The method, according to one or more of the preceding claims, characterized in that it comprises the step of introduction of one or more elements chosen from phosphor, potassium, sulphur, magnesium, calcium, boron, cobalt, copper, iron, manganese, molybdenum, selenium and zinc, present singly or mixtures in all proportions.

The method, according to one or more of the preceding claims, characterized in that the concentrations of phosphor, expressed as P2O5, is comprised between 0.1 and 40% and preferably between 3 and 15%.

The method, according to one or more of the preceding claims, characterized in that the concentration of potassium, expressed as K2O, is comprised between 0.1 and 20% and preferably between 1 and 10%.

The method, according to one or more of the preceding claims, characterized in that the fertilizer has a granulometry comprised between 0.1 and 4.00 mm diameter, and preferably between 0.4 and 1.2 mm diameter.

The method of preparation of a highly efficient, low pollution, slowly nitrogen releasing granular organic-mineral formulation, based on dry blood, tannin and non tannin organic extracts and synthesized nitrogen from methylene-urea, to which the following can be added:

• nitrogen in various forms, phosphor, potassium, calcium, magnesium, sulphur, boron, iron, copper, manganese, zinc, molybdenum, cobalt and selenium in all proportions.

The method of preparation of a fertilizer, according to one or more of the preceding claims, applied directly to the soil and to cultures.

The method, according to one or more of the preceding claims, characterized in that it comprises one or more of the described characteristics.