Method of controlling heavy metal cadmium accumulation of paddy

Abstract

The invention discloses a method for controlling the accumulation of heavy metal cadmium in rice, and belongs to the technical field of rice planting. The method comprises the following steps of: (1) before the land preparation for seedling transplanting, applying a divalent manganese chelate in soil and uniformly mixing the divalent manganese chelate and the soil; (2) during a period from 15 to 20 days after seedling transplanting to 35 to 45 days after the seedling transplanting, spraying aqueous solution of a divalent manganese fertilizer once every other 7 to 10 days; (3) spreading the divalent manganese chelate in the early booting stage and the grouting stage of the rice respectively; (4) irrigating the paddy land within 3 to 5 days after the soil application of the divalent manganese chelate; (5) from the earing period of the rice to the ripening period of the rice, spraying the aqueous solution of the divalent manganese fertilizer once every other 7 to 10 days; and (6) after the soil application of the divalent manganese chelate, applying the divalent manganese chelate in the same way each year, but with an application rate which is reduced by half or three quarters. The method adopts soil application and leaf surface spraying application of the divalent manganese fertilizer and is more effective. The method is wider in application range, more economic and effective and is capable of improving the mineral nutrient element content of the rice and overcoming the adverse effects of the prior art.

Description

technical field [0001] The invention belongs to the technical field of rice planting, in particular to a control Methods of heavy metal cadmium accumulation. Background technique [0002] Cadmium (Cd) is a heavy metal and environmental pollutant that is toxic to animals and plants, and it has strong mobility in paddy soil-rice systems. Cadmium pollution not only affects the yield of rice, but its enrichment in rice seriously reduces the hygienic and nutritional quality of rice. After entering the food chain, it also poses a serious potential threat to human health. In recent years, due to the unreasonable discharge of industrial "three wastes", poor treatment of solid waste (especially urban waste), sewage irrigation, agricultural sludge and application of fertilizers containing heavy metal elements, the content of heavy metal cadmium in the soil has increased sharply. . According to the results of the 2002 and 2003 rice quality and safety surveys conducted by the Rice a...

AI Technical Summary

Problems solved by technology

In recent years, studies have found that a variety of mineral metal element metabolic pathways (cell membrane metal transporters) have the function of cadmium absorption and transport, which also reveals that the control of heavy metal cadmium accumulation in rice may be achieved by removing soil and applying chelated ferrous fertilizers. Other ways to control it, but it is still in the exploratory stage

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