Haifa Chemical South Ltd.

Haifa Chemicals South Ltd.

Boris Gordonov

Uri Michael

Abraham Shaviv

Evgeny Zlotnikov

Preparation of an encapsulated slow-release particulate fertilizer. A particulate fertilizer starting material is pretreated for increasing its capacity of holding powderous material by adhesion. The resulting first intermediary product is coated with a powderous waterproofing material which fuses below the phase transition temperature of the fertilizer. A second intermediary product obtained in this way is heated to a temperature below the phase transition temperature to fuse the waterproofing material.

Method for preparing an encapsulated slow-release particulate fertilizer

An encapsulated slow-release particulate fertilizer product comprising 50-95% by weight of fertilizer and an encapsulating waterproofing sulfurated coat selected from the group of sulfurated unsaturated oils and sulfurated distillation products and distillation residues thereof. The sulfurated coat may bear neutralized carboxylic groups and the product may optionally contain up to 5% by weight of an inert powder serving as conditioner. For making the product an unsaturated oil or a distillation product or residue thereof is reacted with a sulfurization agent and the reaction product is used for the encapsulation of a particulate fertilizer.

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Nesher, Israel

Boris Gordonov