Carbon-based seaweed silicon-selenium suspended fertilizer, preparation method thereof and application of carbon-based seaweed silicon-selenium suspended fertilizer in selenium enrichment and cadmium reduction of rice

Abstract

The invention discloses a carbon-based seaweed silicon-selenium suspended fertilizer, a preparation method thereof and application of the carbon-based seaweed silicon-selenium suspended fertilizer in selenium enrichment and cadmium reduction of rice. The fertilizer is prepared by dispersing a seaweed carbon-based cross-linking agent and selenite in a silicic acid sol and ammonia mixture solution to form a suspending agent, adding a macroelement fertilizer, and fully mixing. Silicic acid colloid, seaweed carbon-based material and clay substance are mutually crosslinked to form a similar network compact space and become a fluid with stable dynamics, so that functional substances in the suspended fertilizer can be stably dispersed in the fertilizer for a long time. According to the method, the seaweed carbon-based silicon-selenium suspended fertilizer which is high in silicon and selenium content, high in effectiveness, high in stability and excellent in suspension property and gives consideration to macro-element supply can be prepared. In the tillering stage and the filling stage, the fertilizer is applied to rice growing in cadmium-contaminated soil in a leaf surface spraying mode and a rhizosphere ditching annular application mode respectively, the cadmium absorption of the rice is reduced by 21.0%-63.9%, and the selenium content of the rice is increased by 42.0%-119%.

Description

technical field [0001] The invention relates to the fields of crop cultivation, plant nutrition, and fertilizer industry, in particular to a carbon-based seaweed silicon-selenium suspension fertilizer, a preparation method thereof, and an application in enriching selenium and reducing cadmium in rice. Background technique [0002] Cadmium (Cd) is a biological non-essential toxic element, which can damage human bones, liver, kidneys and other organs, and also has the risk of teratogenic and carcinogenic. The biological half-life of cadmium is 10 to 30 years; even if the intake is stopped, a high proportion of cadmium will remain in the human body. Cadmium can enter and accumulate in the human body through the food chain from polluted soil and water, causing chronic poisoning. Rice (Oryza sativa L.) is the staple food of Chinese residents, and it is also the main source of cadmium exposure for the general population. The whole country has 2786km 2 According to the survey co...

AI Technical Summary

Problems solved by technology

[0006] However, most of the silicon and selenium fertilizers currently on the market have single nutritional components and need to be used in conjunction with other fertilizers to meet the nutrient requirements of crops during growth; and the lack of components that can control nutrient release may easily cause premature loss of nutrients

At the same time, conventional selenium fertilizers are susceptible to valence changes due to external pH and redox environments, thereby affecting fertilizer efficiency and even producing toxic effects. In addition, conventional silicon fertilizers also have poor solubility under weakly acidic to neutral conditions, and the solution is prone to polymerization. Shen's question

Although zero-valent nano-selenium can overcome the potential toxicity of excessive selenium to crops, its corresponding bioavailability is not as good as that of acid radical ions and organic amino acids.

Images