5results about How to "Reduce cadmium content" patented technology

The invention belongs to the technical field of heavy metal pollution treatment, and discloses a method for reducing soil cadmium activity and wheat grain cadmium content. According to the method, the low-cadmium-accumulation wheat variety is selected, the composite conditioner is applied, the low-cadmium-accumulation wheat variety is Jimai 22, and the composite conditioner is composed of mineral source potassium fulvate and zinc fertilizer. The complex passivation effect of humic acid components in mineral source potassium fulvate on soil heavy metal is utilized, the ion antagonism effect of zinc and cadmium and the low cadmium accumulation characteristic of Jimai 22 are combined, the cadmium content of wheat grains is synergistically reduced to 0.1 mg / kg or below, meanwhile, the cadmium content of the soil can be remarkably reduced, and the soil with cadmium exceeding the standard can be repaired. The treatment method provided by the invention has the advantages of simple operation, easily available raw materials, low cost, stable synergistic cadmium reduction effect and the like.

The application is the application of Spirodela and microorganisms in repairing cadmium-polluted water bodies and reducing cadmium content in cadmium-polluted paddy field rice grains. The specific steps are as follows: first, prepare Oscillospiraceae bacterial suspension, Enterobacter bacterial suspension and Pantoea bacterial suspension respectively; then mix the three kinds of bacterial suspensions in proportion to obtain a mixed bacterial suspension; then add the mixed bacterial suspension and Spirodela prepared in proportion to the cadmium-polluted water bodies to be repaired or the cadmium-polluted paddy fields to be repaired, and the Spirodela and the microorganisms form a "Spirodela-functional bacterial community" symbiotic system; the microorganisms further transport cadmium to the leaves by adsorption, transformation, leaf surface sedimentation or transpiration; finally, the Spirodela is concentrated for treatment, thereby repairing the cadmium-polluted water bodies or reducing the cadmium content in the cadmium-polluted paddy field rice grains. Through the application, the cadmium-polluted water bodies can be better repaired, and the cadmium content in the cadmium-polluted paddy field rice grains can be effectively reduced.

The application discloses a synthetic cadmium-resistant bacterial group, a carbon-based microbial agent containing the same, and a preparation method and application thereof, and belongs to the technical field of microbial soil remediation. The synthetic cadmium-resistant bacterial group is composed of Pseudomonas putida RC1, Citrobacter braakii RS1 and Acinetobacter johnsonii RZ1. The bacterial group is compounded with carbon-based materials to form a carbon-based microbial agent, which can significantly reduce the content of effective cadmium in soil, promote the transformation of cadmium from acid-soluble state to oxidizable state and residual state, inhibit the absorption of cadmium by plants, and improve crop yield. The agent shows stable remediation effect in cadmium-contaminated paddy soils of various parent materials, such as acid purple soil, neutral purple soil, calcareous purple soil, typical yellow soil and grey fluvo-aquic soil, has broad spectrum applicability, and is suitable for safe production and soil remediation of cadmium-contaminated farmland.

This invention relates to a method for promoting the germination of buckwheat seeds under cadmium stress and alleviating cadmium toxicity during the seedling stage. The method includes treating buckwheat seeds with a melatonin reagent before germination. The method involves contacting the plant seeds with a melatonin solution at a concentration of 100-500 μmol / L. The method provided by this invention can effectively improve the germination potential and germination rate of buckwheat seeds under cadmium stress, enabling uniform and rapid germination. This invention solves the important problem of how to ensure normal germination of buckwheat in cadmium-contaminated soil in agricultural production and has significant application value in production. This is likely because pretreatment with a melatonin reagent can induce the expression of antioxidant enzyme activity, scavenge the large number of free radicals generated by cadmium stress, alleviate oxidative stress, reduce oxidative damage, and maintain a low level of membrane lipid peroxidation in the seeds, thereby promoting normal seed germination.

This invention discloses a liquid microalgae fertilizer that can reduce the cadmium content of rice. The liquid microalgae fertilizer for reducing cadmium content in rice is composed of the following components by mass percentage: 50%-75% concentrated algae solution, 5%-12% humic acid, 2%-8% potassium fulvate, 0.1%-0.5% xanthan gum, 0.1%-0.5% sodium alginate, and the remainder being water.