The application discloses a kind of nanometer zero-valent iron
rhizosphere injection methods of controlling and preventing the accumulation of
cadmium in rice, according to the law of
cadmium absorption and accumulation of rice, nanometer zero-valent iron
rhizosphere injection is carried out in critical growth period, the difference between rice yield and
cadmium content of rice under the action of nanometer zero-valent iron is analyzed, and the
optimal design scheme for controlling and preventing the accumulation of cadmium in rice is constructed accordingly.The specific steps include the design of
rhizosphere injection equipment, the selection of rhizosphere injection concentration and time, field double-factor orthogonal test, the determination of the best period for controlling and preventing the accumulation of cadmium in rice is the
grain filling period, and the optimal injection concentration is 100mg kg ‑1 Compared with the traditional technology, the method has high
ecological safety and excellent effect of controlling and preventing the accumulation of cadmium in rice.The technology forms a local
high concentration within the effective range of rhizosphere in the critical growth period, which can reduce the amount of nanometer zero-valent iron under the premise of ensuring the
control effect, and is conducive to reducing the use cost of nanometer material soil
pollution remediation technology.