Particles of fertilizers encapsulated in modified chitosan and obtaining method

A method to obtain particles of fertilizers encapsulated in modified chitosan, the method comprising the following steps:

• i) modifying physical-chemical properties of chitosan by;
• a) preparing a solution consisting of chitosan and an organic acid solution at 1% (v/v);
• b) adding at least one sugar-type carbohydrate;
• c) performing a high frequency ultrasound treatment to obtain a modified chitosan solution;
• d) mixing the modified chitosan solution with deionized water;
• and
• ii) encapsulating a nutritive agent or an active agent in the modified chitosan to form a micro or nano sphere matrix by:
• e) mixing in equal proportions the modified chitosan mixed with deionized water and the nutritive agent or the active agent, keeping stirring at a temperature of 40° C., for about 30 minutes;
• f) spray drying the mixture from the previous step at air pressure of between 3 to 6 bars and a temperature of up to 250° C. to obtain the fertilizer encapsulated in modified chitosan.