Rice cadmium reduction method based on soil water potential in ripening stage

Abstract

The invention provides a rice cadmium reduction method based on soil water potential in a ripening stage. The rice cadmium reduction method comprises the following steps that a water regulation and control irrigation measure is carried out on a rice field from the ripening stage of rice to harvesting, and the water regulation and control irrigation measure means that the soil water potential of the rice field is maintained at -18.6 KPa to -0.6 KPa. Compared with a method for drying the field from the rice dough stage to the harvesting stage, the rice cadmium reduction method has the advantages that the effectiveness of soil Cd can be remarkably reduced, migration of Cd to all parts of rice plants and enrichment of Cd in rice grains can be inhibited, the effectiveness of soil Cd can be reduced by 27.9%-35.9%, and the content of Cd in the rice grains can be reduced by 32.4%-40.1%.

Description

technical field [0001] The invention belongs to the technical field of rice cultivation, and in particular relates to a method for reducing cadmium in rice based on soil water potential in wax ripening stage. Background technique [0002] Rice (Oryza sativa.L) is the most important food crop in my country. However, with the intensification of heavy metal pollution in farmland soil in recent years, the problem of "cadmium rice" has gradually become prominent. As early as 2002, the Rice and Product Quality Supervision, Inspection and Testing Center of the Ministry of Agriculture conducted safety sampling inspections on rice in the national market, showing that the rate of cadmium in rice exceeded the standard by 10.3%. According to other data, the rate of rice Cd exceeding the standard in southern my country is about 23%, and in more seriously polluted provinces such as Hunan, Guangdong and Guangxi, the rate of rice exceeding the standard is as high as 60% to 88%. Soil Cd pol...

AI Technical Summary

Problems solved by technology

These two methods have their own advantages and disadvantages. The former is basically flooded during the vegetative growth stage, and most of the time during the reproductive growth period is also flooded. Although it can significantly reduce the absorption of Cd by rice, flood irrigation will cause stunted rice plants, Poor stress resistance, late lodging, fertilizer loss, etc., and the rice yield has dropped significantly, and water consumption has greatly increased, etc.

The latter is treated in the sun-dried field during the mature stage. Although it can avoid the late yield reduction of rice to a certain extent, this treatment will lead to the enrichment of Cd in rice grains.

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