NOVELTY - Formulation (f1) comprises mixture of: a) a matrix, which may be defined as being either an monomeric, dimeric, multimeric, oligomeric- or a polymeric backbone which may be acidic or basic in nature, branched or linear, crosslinked or non-crosslinked and may exist in the free form or covalently linked to, mixed with and/or grafted with neutral components which includes polyethylene glycol, propylene glycol, or fatty acid condensates, b) at 8 wt./wt.% bioactive substance imbedded or trapped within the matrix; c) 0-40 wt.% additive or a modifier.    USE - For formulating a pesticide (claimed); for applying as granules, as suspensions, emulsions in sprays, as foams, or as coats for seeds and fertilizers; sprayed as concentrates; for applying to foliage, soil, irrigation water, construction materials, seeding materials, grains, and buildings; for field application, wood and stone handling, textile treatment, and seed coating.    ADVANTAGE - The bioactive substances imbedded or mixed into functionalized matrices to form homogenous water-insoluble solid complexes with desirable field properties such as reduced leaching in soil, improved leaf retention (rainfastness), selective unloading to roots and convenient packaging and application. Bioactive substances that may be so complexed include pharmaceutical agents and pesticides including. The matrix is biologically degradable, sparingly soluble in water, amenable to disagregation by organisms (notably roots of plants) and other sources of protons, and able to promote the retention of chemical agents against concentration gradients in water. The matrices exert their beneficial effects through binding to both the bioactive substance to be delivered and interaction with the leaf, soil or organic matter to modify pesticide exposure to the environment.    DETAILED DESCRIPTION - INDEPENDENT CLAIMS are included for the following:    (1) formulation (f2) comprising a mixture of: a matrix comprising alkylamine and/or alkylacid, reaction product of carboxylic acid and/or carboxylic anhydride and/or ester and/or fat with the primary or secondary amino functions of an amino compound and/or the hydroxyl functions of an amino alcohol; a bioactive substance imbedded or trapped within the matrix; and at least one 0-95 wt.% additives or modifiers;    (2) formulating (M1) a pesticide involving: grounding dried mixture to an average particle size of less than 0.2 mm in diameter; and    (3) preparing formulation (M2) involving mixing bioactive substance with a matrix and/or additive and melting this mixture in the course of preparation, processing or use.