Method for comprehensively controlling cadmium pollution of rice by utilizing modifier and agricultural technology

Abstract

The invention relates to a method for comprehensively controlling cadmium pollution of rice by utilizing a modifier and an agricultural technology. The method comprises the steps of irrigating a rice field at the final booting phase of the rice, keeping a water layer of 2-3 cm on a field surface, broadcasting 60 Kg quicklime per mu into water uniformly, and keeping a waterflooding state of the field till the field is dried or drained by nature transpiration and evaporation 5 days before harvesting. With the adoption of the method, Cd elements in soil are gathered at inedible parts of the rice, such as a root, a stem and a leaf, so that the Cd accumulation amount at a grain part is reduced significantly; the Cd elements are effectively prevented and controlled from migrating to the rice; and the Cd content in the rice is reduced.

Description

technical field [0001] The invention relates to a method for controlling cadmium pollution in rice, in particular to a method for comprehensively controlling cadmium pollution in rice by using improver and agronomy. Background technique [0002] With the continuous advancement of industrialization and urbanization, the problem of heavy metal pollution in my country's soil has been paid more and more attention by people. According to the survey data of the Ministry of Environmental Protection in 2000, my country has the characteristics of small per capita cultivated land, the total amount is decreasing year by year, the use is unstable, the quality is declining, and the soil in some areas is seriously polluted by heavy metals; at the same time, according to Chen Manhuai’s 1996 publication Heavy Metal Pollution in Soil-Plant Systems” records that the area of ​​cultivated land polluted by heavy metals such as Cd, As, and Pb in my country is nearly 2.0×10 7 hm 2 , accounting fo...

AI Technical Summary

Problems solved by technology

However, most of these studies focus on the pot experiments of continuous flooding during the whole growth period of rice, and mainly study the Cd pollution of rice at the mature stage, while there are few reports on the migration and accumulation of Cd in rice during the whole growth period of field experiments. In particular, comprehensive measures combining amendment application and flooding technology are rarely reported.

Images