The invention belongs to the technical field of
agriculture, and particularly relates to application of
humic acid to promotion of
phosphorus absorption of
salvia miltiorrhiza, and
phosphorus comprises at least one of
organic phosphorus and
inorganic phosphorus; the application amount of the
humic acid is calculated according to the content of free
humic acid in the humic acid, and 10-100 mg of free humic acid is applied to each
salvia miltiorrhiza
plant. After humic acid is applied to
salvia miltiorrhiza, low-activity
phosphorus in
salvia miltiorrhiza rhizosphere soil is promoted to be converted into high-activity phosphorus by improving the activity of
acid phosphatase, and the phosphorus supply potential of the soil and accumulation of
salvia miltiorrhiza biomass are improved. By applying humic acid, the content of rapidly available phosphorus in
rhizosphere soil of
salvia miltiorrhiza is reduced. By applying humic acid, the content of phosphorus in
rhizosphere soil of salvia miltiorrhiza is changed, the content of
organic phosphorus in the rhizosphere soil is remarkably increased, and the content of
inorganic phosphorus is reduced. Therefore, the humic acid improves the activity of soil
phosphatase and promotes low-activity phosphorus to be converted into medium-activity and high-activity phosphorus, so that the absorption and utilization of the red-rooted salvia root on the phosphorus element are promoted, and the growth and development of the red-rooted salvia root are improved.