The invention provides a foliar
fertilizer. The foliar
fertilizer is prepared from 0.1%-0.9% of 5-aminolevulinic acid, 3%-8% of
potassium fulvate, 0.2%-0.3% of
sodium citrate, 0.2%-0.3% of trace elements, 1.2%-2.8% of
amino acid and the balance of water. 5-aminolevulinic acid is matched with
potassium fulvate for use, a small amount of trace elements,
sodium citrate and
amino acid are used as auxiliary materials, the quick-acting property of the
amino acid is exerted, the persistence of
potassium fulvate is realized, absorption of trace elements can be promoted in each stage of
plant growth, the utilization efficiency of trace elements is improved to the greatest extent, the effects of regulating
chlorophyll synthesis and regulating
plant growth of 5-aminolevulinic acid are achieved at thesame time, the
fertilizer has quick-acting property and persistence, plants are promoted to absorb trace elements in the fertilizer to the maximum extent, the
absorption efficiency of the trace elements is improved, the use amount of the trace elements is reduced, resource waste caused by excessive use of the trace elements is avoided, and the
crop yield is obviously increased.