The invention discloses a preparation method of a
mikania micrantha active extract based on high-temperature
water extraction and application of the
mikania micrantha active extract in promoting growth of
eucalyptus, and belongs to the technical field of
plant resource utilization and
agriculture and
forestry. The method comprises the following steps: crushing
mikania micrantha which is naturally dried in the shade, adding a
solvent according to a proper material-
liquid ratio, performing
reflux extraction at high temperature by adopting mikania micrantha extraction equipment, and filtering to obtain an active extract. After the extract is diluted,
eucalyptus seedlings are irrigated, and the
plant height and the ground
diameter increase can be remarkably increased and are respectively increased by 13.5% and 16.4% compared with those of a normal-temperature extraction group. The method is easy and convenient to operate, high in extraction efficiency,
environmentally friendly, free of organic solvents and pure water and suitable for popularization of basic forest farms and nursery gardens, and high-value utilization of mikania micrantha is achieved.