Method for identifying rice variety suitable for being planted in soil with what level of cadmium pollution

Abstract

The invention discloses a method for identifying a rice variety suitable for being planted in soil with what level of cadmium pollution. The method comprises the steps that five kinds of soil with the cadmium content of 0.2-0.29 mg / Kg, 0.3-0.59 mg / Kg, 0.6-0.99 mg / Kg and 1.0-1.99 mg / Kg and with the cadmium content larger than 2 mg / Kg respectively is prepared, and rice of the variety is respectively planted in the soil, and is cultivated according to a conventional fertilizer application level and a conventional planting environment; rice seeds are harvested according to different levels of the cadmium content after the rice is ripe, the cadmium content of the rice after dehulling is measured, and it is indicated that the rice is suitable for being planted in the soil with the corresponding cadmium content levels if the cadmium content of the rice is lower than 0.2mg / Kg. According to the method, through the comparison of the cadmium contents of the rice of the different varieties planting in the soil with the different cadmium contents, the low-cadmium rice variety allowing the rice with the cadmium content lower than 0.2mg / Kg to be produced in the soil with the different pollution levels is identified.

Description

technical field [0001] The invention relates to a method for identifying which rice variety is suitable for planting in soil with cadmium pollution level. Background technique [0002] Cadmium (Cd) is one of the most common heavy metals polluted in farmland in my country. According to statistics from the Ministry of Agriculture, more than 10% of my country's arable land is polluted by cadmium (greater than 0.3 mg / Kg), and grains polluted by heavy metals such as cadmium are as high as 12 million tons every year. Cadmium pollution enters the human body through the food chain, and long-term consumption will seriously endanger human health, and even cause "bone pain disease". [0003] Among the 31 batches of rice with excessive cadmium content detected by the Guangdong Food Safety Office in 2013, 14 batches came from Hunan, and the cadmium content ranged from 0.26 mg / Kg to 0.93 mg / Kg per kilogram. Facing this grim situation, popularizing low-cadmium rice varieties is the main ...

AI Technical Summary

Problems solved by technology

The inventor's research on screening low-cadmium rice varieties in the natural fields of soil cadmium-contaminated areas for many years shows that the reproducibility of the research results is extremely poor. The inhomogeneity of the organic matter in the field leads to the difference in the organic matter content in the field, which affects the availability of cadmium, and the cadmium content in the irrigation water of the polluted area is variable, etc.

Therefore, an ideal method for screening low-cadmium rice varieties has not been established so far, and it is impossible to achieve a true evaluation of the cadmium uptake level of different rice varieties under different cadmium content backgrounds