Materials and methods for the formation of microcapsules that include a high concentration of agriculturally active ingredients (AIs) and a lipophilic polymer encapsulated within a polymeric shell formed via an interfacial polycondensation reaction. Under some conditions, these microcapsules may be formed using less lipophilic solvent than is required using convention microencapsulation techniques. These inventive methods include forming an oil-in-water emulsion in some cases using a first polymer as a lipophilic solvent for the AI and forming a microcapsule that includes the AI and polymer. Other methods include forming a microcapsule that includes a lipophilic monomer, agriculturally active ingredient and initiator having a polymeric shell then elevating the temperature to initiate polymerization of the monomer with the microcapsule.
