Effects of Nitrogen Fertilizer on the Cadmium Transfer and Bioavailability in Paddy Soils

Xiangping SUN; Li YAN; Liangbin ZENG

doi:10.12101/j.issn.1004-390X(n).201707005

JOURNAL OF YUNNAN AGRICULTURAL UNIVERSITY（Natural Science） > 2018 > 33(5): 941-946. > DOI: 10.12101/j.issn.1004-390X(n).201707005

Xiangping SUN, Li YAN, Liangbin ZENG. Effects of Nitrogen Fertilizer on the Cadmium Transfer and Bioavailability in Paddy Soils[J]. JOURNAL OF YUNNAN AGRICULTURAL UNIVERSITY（Natural Science）, 2018, 33(5): 941-946. DOI: 10.12101/j.issn.1004-390X(n).201707005

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Effects of Nitrogen Fertilizer on the Cadmium Transfer and Bioavailability in Paddy Soils

Institute of Bast Fiber Crops, Chinese Academy of Agricultural Sciences, Changsha 410205, China

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Received Date: July 01, 2017
Revised Date: October 26, 2017
Available Online: October 15, 2018
Published Date: August 31, 2018

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Abstract

Purpose Farmland soil is heavily polluted by heavy metals. Cadmium pollution not only can affect the rice yield, quality and whole farmland ecosystem function in paddy fields, but also can harm human health through food chain transmission. Fertilization has a significant effect on the bioavailability of heavy metals. Nitrogen fertilizer is as an important stimulation in an agricultural production; therefore, the appropriate amount of fertilizer is vital for the bioavailability of cadmium in the application of nitrogen fertilizer in paddy soils.

Method The effects of nitrogen fertilizer on the migration and transformation of cadmium and the uptake of rice were studied to simulate the concentration of cadmium in paddy field at 5 mg/kg by using different nitrogen application rates: no nitrogen treatment (CK), nitrogen fertilizer application rate of 90 kg/hm² (CF90), nitrogen fertilizer application rate of 150 kg/hm² (CF150), nitrogen fertilizer application rate of 200 kg/hm² (CF200) in pot experiment.

Result The application of nitrogen fertilizer reduced the pH value in soil, and the pH value of high nitrogen treatment decreased from 6.3 to 5.7. High nitrogen application increased the Eh value in rice soil, especially at elrogation stage. The proportion of exchangeable cadmium in the soil decreased from 65% to 50%, but increased the proportion of exchangeable cadmium in the soil, and the proportion increased from 5% to 15%.

Conclusion The amount of nitrogen applied was negatively correlated with pH, and it was positively correlated with the cadmium content of aboveground pant . The high nitrogen application promoted the transfer of cadmium to the aboveground part of rice, and the content of cadmium in the aboveground part of rice was positively correlated with the amount of nitrogen applied in this study. The results provide an important reference for the adoption of agronomic measures to regulate the use of cadmium contaminated farmland.
- nitrogen fertilizer,
- paddy soil,
- cadmium,
- bioavailability

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