The invention discloses a modified
phosphorus-containing liquid
fertilizer and a preparation method thereof. The modified
phosphorus-containing liquid
fertilizer is prepared from the following raw materials in parts by weight: 2-60 parts of a
phosphorylation reagent, 10-300 parts of
humic acid salt, 100-700 parts of a macroelement
fertilizer body, 0-100 parts of a medium element fertilizer body, 0-30 parts of a microelement fertilizer body, 1-50 parts of a surfactant and 300-800 parts of water. The invention further provides the preparation method for the modified
phosphorus-containing liquidfertilizer. According to the modified phosphorus-containing liquid fertilizer and the preparation method thereof, a molecular chain of the
humic acid salt is
cut under the action of the
phosphorylation reagent, in addition, graft modification is achieved, and therefore the variety and the number of functional groups are enriched, the chelating ability is improved, when the
humic acid salt is mixedwith macroelements, medium elements and microelements, the multiple effects of activating, converting, moving and the like on the
phosphate fertilizer are achieved, high-valence
metal cations in soilcan also be adsorbed and complexed, sufficient absorption and utilization of crops are facilitated, the formation of an insoluble
phosphate fertilizer is avoided, the environment
pollution is reduced, and the damage to the
soil structure is reduced.