Cadmium uptake by paddy rice and soil available Cd under water flooding as affected by nitrogen fertilizer

文献类型： 外文期刊

第一作者： Wang Zheng-yin

作者： Wang Zheng-yin;Qin Yu-sheng;Jiaka La-tie;Tu Shi-hua

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关键词： nitrogen fertilizer; paddy rice; soil available cadmium; cadmium uptake

期刊名称：2010 4TH INTERNATIONAL CONFERENCE ON BIOINFORMATICS AND BIOMEDICAL ENGINEERING (ICBBE 2010)

ISSN： 2151-7614

年卷期： 2010 年

页码：

收录情况： SCI

摘要： In order to tackle the problem of Cd pollution in paddy soils and investigate soil available Cd as affected by nitrogen fertilizers, incubation and pot experiments were carried out to study effects of different nitrogen fertilizers and rates of urea on cadmium uptake by paddy rice and soil available Cd under water flooding condition. Results revealed that soil pH increased sharply after the soil was flooded, especially at the beginning of incubation, and gradually decreased with incubation time and finally tended to approach the neutral values. The patterns of soil pH change were just opposite to those of soil available Cd, a negative correlation observed between the two. Soil flooding made the soil available Cd drop by 58.2%-84.1%. Among 4 nitrogen fertilizers, the NH4Cl treatment significantly increased Cd content in rice more than the other three treatments including urea, (NH4)(2)SO4 and NH4NO3 and facilitated transfer of Cd from rice straw to grains; there was no significant difference in Cd contents in both straw and grains between the latter three nitrogen treatments. Optimal rate (N 0.2 g center dot kg(-1)) of urea could significantly lower the Cd concentration in rice grains, while either no N or high rate of urea treatment significantly enhanced the Cd concentration in grains. Results further revealed that on the Cd contaminated paddy soil, employing a Cd resistant rice cultivar in combination with optimized fertilizer and water management practices could lower the Cd content in rice grains far below the maximum permissible level of 0.2 mg center dot Cd kg(-1) set by the state for the pollution-free rice production.

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