Water and fertilizer regulation and control method for improving growth of rice in arsenic-contaminated rice field and lowering arsenic absorption

Abstract

The invention discloses a water and fertilizer regulation and control method for improving growth of rice in an arsenic-contaminated rice field and lowering arsenic absorption and belongs to the technical field of soil contamination treatment. In severe-arsenic-contaminated rice field soil (the arsenic concentration of soil reaches 320mg / kg and is 8 times that of secondary standards for soil environment quality), rice plants cannot survive in case of water-flooded planting. According to the method, solid ferrous sulfate and lime are added into the severe-arsenic-contaminated soil, the addition level of the ferrous sulfate is 0.25% to 1%, the addition level of the lime is half that of the ferrous sulfate, the moisture content of the soil is kept to be 100% that of field water-holding capacity in an entire growing period (no obvious water layer arises), the rice survives and is good in growth vigor, the biomass of the rice is increased by 334% to 355%, the arsenic concentration of the upper part of the rice field is lowered by 31% to 50%, and meanwhile, rice grains of the rice are increased to 690 to 914 grains per plant from no grain filling, so that the yield is increased obviously.

Description

technical field [0001] The invention belongs to the treatment technology of severe arsenic pollution in paddy fields, and specifically discloses a water and fertilizer control method for improving rice growth and reducing arsenic absorption in arsenic-polluted paddy fields. Background technique [0002] Arsenic is identified as a "known human carcinogen" by the World Health Organization and the US Environmental Protection Agency. Using polluted drinking water sources or eating rice containing arsenic for a long time will lead to chronic arsenic poisoning, which will cause a series of health problems, including Skin lesions, respiratory diseases, lung cancer and nervous system diseases, etc. [0003] Paddy field is a typical farmland ecosystem in my country with a long history and important status. The history of rice cultivation in my country is as long as 7,000 years. Rice production ranks first in the world, accounting for about 50% of the country's total grain output, an...

AI Technical Summary

Problems solved by technology

For arsenic-contaminated paddy soil, the commonly used physical and chemical treatment methods are costly and have a high risk of secondary pollution, and are not suitable for the remediation of large-scale contaminated soil. The more economical phytoremediation methods will also be difficult to treat due to the remediation of plants or affect large areas. Therefore, reducing the bioavailability of arsenic, reducing the uptake of arsenic in rice, and in situ regulation of arsenic pollution in rice soil are the current research hotspots at home and abroad.

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