Abstract:

A field experiment was conducted to explore the adaptability of different combination models of “VIP+n” cadmium-reduction technology in light cadmium pollution field at Yangjiaqiao Town, Xiangtan County, using early rice (‘Zhongjiazao 17’ and ‘Xiangzaoxian 24’) and late rice (‘Hyou 518’ and ‘Yueyou 27’) as materials. Focusing on the ecology, economy and planting habits of the areas with light cadmium pollution, the best localization technology mode of “VIP+n” of the county was constructed. The results showed that the cadmium content in early rice was lower than that in late rice. Different combinations of “VIP+n” cadmium-reduction technologies had good adaptability in areas with light cadmium pollution and the cadmium reduction rate was at least above 40%, which could reduce the cadmium content of rice to be lower than the national standard of 0.2 mg/kg. Thus, the remediation technology combination of “local rice variety + lime” is the optimum promotion mode to reduce cadmium content of rice in farmland lightly polluted by heavy metals in terms of ecological benefit, economic benefit and cadmium-reduction of rice.

Key words: rice, VIP technology, cadmium pollution, quick lime