This invention discloses an in-situ
depolymerization modification composition of mineral-derived
humic acid, its method, and its applications. The composition comprises a
hydrogen bond
acceptor and an acidic
hydrogen bond donor, wherein the
hydrogen bond
acceptor is selected from one or more of
choline compounds,
betaine compounds, and
quaternary ammonium salt compounds; and the acidic
hydrogen bond donor is an aliphatic polycarboxylic acid or a hydroxycarboxylic acid. This method is simple, green, and efficient, yielding a product with low molecular weight, good water
solubility, and strong resistance to
hard water. It is suitable for various product forms such as
solid fertilizers, liquid
fertigation fertilizers, and soil conditioners, and has broad application prospects in modern
agriculture and ecological restoration.