MEDIUM TRACE ELEMENT MIXTURE AND PREPARATION METHOD OF MEDIUM TRACE ELEMENT-WRAPPED FERTILIZER

摘要

A medium trace element mixture and a preparation method of a medium trace element-wrapped fertilizer. The medium trace element mixture is prepared from the following components: 50%-90% of sulfur, 5%-20% of a swelling material, and 5%-45% of a medium trace element other than sulfur. The preparation method comprises: adding the medium trace element and the swelling material into liquid sulfur and evenly mixing same. The preparation method of the medium trace element-wrapped fertilizer comprises: placing a conventional granular fertilizer in a wrapping device having a heating function; after heating the medium trace element mixture to a certain temperature, spraying on the surface of a granular fertilizer; and forming a medium trace element film on the surface of the fertilizer by cooling and curing. The present invention has the advantages that the medium trace elements are quickly and flexibly added; the problem of uniform dispersion of the medium trace elements in soil is solved, and the local poisoning is avoided; the film formed by wrapping the medium trace element material is firmly combined with fertilizer particles, and is not easy to fall off; fast-acting and long-acting combined medium trace element materials can be wrapped, which is beneficial to the nutritional needs of crops in the whole growth cycle.