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Influence of Soil p H on Cadmium Absorption by Rice in Main Rice Production Region of South China

[Objective] The research aimed to study the influence of soil p H on Cd absorption by rice in rice production region of South China. [Method] The influence of soil p H on Cd absorption by rice in main rice production region of South China was studied. The reasons for difference of the absorption coefficient by rice under the same soil p H in the different research areas were also discussed. [Result]The soil p H had a significant impact on rice Cd absorption coefficient. There was the largest absorption ability of Cd by rice with soil p H 5- 6. The absorption coefficient decreased significantly when soil p H increasing from 6 to 7. The differences of the absorption coefficient of Cd by rice between soil p H 5- 6 and soil p H 6- 7 were up to 1. 4- 7. 4 times. Rice genotypes diversity,soil organic matter and soil texture were less able to affect the Cd absorption by rice comparing to the soil p H. The Zn / Cd ratio of soil was an important factor affecting the absorption of Cd by rice.High Zn / Cd ratio of soil tended to reduce significantly the absorption of soil Cd by rice. It may be one of the important reasons for the difference of the Cd absorption coefficient by rice among different areas at the same soil p H. [Conclusion]The research could provide certain technical reference for scientifically managing farmland.