This invention discloses a method and application for soil improvement and
carbon sequestration enhancement in castor bean cultivation in
saline-alkali land, relating to the field of agricultural planting technology. The method includes: planting
castor beans in
saline-alkali land using an
agroforestry model; and spraying
exogenous hormones during the
seedling,
budding, and flowering stages of the
castor beans. The
exogenous hormones are indoleacetic acid (IAA) or
gibberellin, with the IAA and
gibberellin spraying concentrations
ranging from 50 μM to 200 μM. This method can lower the
soil pH in coastal
saline-alkali land, improve soil physicochemical properties, and increase soil organic carbon and
organic matter content. Simultaneously, it can effectively enhance
soil carbon storage, castor bean
plant carbon sequestration, and total carbon accumulation. The method has low operating costs, stable improvement effects, and balances the needs of
land use and ecological
carbon sequestration improvement in saline-alkali land, providing a theoretical basis and
technical support for enhancing
soil carbon sequestration in coastal saline-alkali land.