The invention discloses a method for reducing the content of
cadmium in middle rice. The method includes the following steps that after middle rice of the first year is harvested, middle
rice straw is returned to the field directly, and
tillage is conducted so that the middle
rice straw can be evenly mixed with soil; hyperaccumulation plants are planted in a paddy; after the hyperaccumulation plants are removed from March to May in the second year, soil heavy
metal passivator is scattered on the surface of soil of the paddy;
tillage is conducted, and base
fertilizer is applied 3-5 days later;
tillage is conducted, and rice is transplanted; during planting of rice, a foliar resistance control agent is sprayed in the later tillering stage and the
booting stage of rice respectively, wherein spraying time interval is 5-10 days; field
drying is conducted in the later tillering stage, natural
drying is conducted in the maturation stage, and flooding
irrigation is conducted in other development stages. According to the method,
crop production and
straw resource utilization are not affected, the dual targets of reducing the paddy
soil cadmium content and reducing the rice
cadmium content are achieved under the combined action of
plant extraction, soil
passivation, foliar resistance control and water management, and effects are more remarkable compared with other combination technologies.