Skw Trostberg Aktiengesellschaft

Hermann Raveling

Horst Michaud

Joachim Von Seyerl

Josef Seeholzer

Gerhard Smutek

The present invention provides an agent for inhibiting the nitrification of nitrogen-containing fertilizers based on dicyandiamide, which comprises 1 to 40% by weight of a fertilizer which is readily soluble in water and/or ammonia. The present invention also provides a process for the production of this agent, wherein finely particulate dicyandiamide is sprayed with an aqueous solution of a fertilizer which is readily soluble in water and/or ammonia and subsequently dried.

Nitrification-inhibiting agent and process for the production thereof

The present invention provides a process for the modification of the crystal form of dicyandiamide, wherein dicyandiamide is crystallized from aqueous solution in the presence of 0.001 to 10% by weight of polyvinyl alcohol and/or of a water-soluble cellulose ether derivative, referred to the amount of dicyandiamide. The crystalline dicyandiamide obtained in this manner has outstanding flow and storage properties and its mechanical strength is substantially improved.

Process for the modification of the crystal form of dicyandiamide

The present invention provides a stabilized fertilizer solution, especially a nitrogen fertilizer solution, with a content of dicyandiamide as nitrification inhibitor, wherein, for retarding dicyandiamide crystallization, the solution contains at least one water-soluble organic polymeric compound as stabilizer.

Growing community of inventors

Altenmarkt, Germany

Hermann Raveling