The variation of F content in rice plants and in paddy soil at different Al2(SO4)3 application levels was investigated in a biological pot experiment. The results showed that rice plants absorbed F extravagantly, and the order of F content in each part was as follows: husk＞brown rice ＞root＞straw. At a given F level in soil, the concentration of F in each part was firstly decreased and then increased with rising Al2(SO4)3 application level. It minimized at 0.4% and 0.6% of Al2(SO4)3 levels, showing extremely significant difference with the blank control. As Al2(SO4)3 application level increased, the contents of free F and water soluble F were gradually decreased. The linear analysis showed that the two forms of F was negatively correlated with the amount of Al2(SO4)3 . But there was significant positive correlation between the content of residual F and Al2(SO4)3. The content of exchangeable F in soil firstly increased and then decreased with the increase of Al2(SO4)3 application amount and peaked at 0.2% Al2(SO4)3 level. However, the exchangeable F content in soil at 0.2% Al2(SO4)3 level was not significantly different from that of the control, and was extremely significantly differed with those at 04%-0.8% Al2(SO4)3 levels, indicating that Al2(SO4)3 mainly depressed the exchangeable F. The contents of complex F, Fe/Mn binding F and organic F were also firstly increased and then decreased with their maximum appeared at 0.4% and 06% Al2(SO4)3 levels. Correlation analysis showed that there was a significantly or extremely significantly negative correlation between the concentration of F in each part and the contents of Fe/Mn binding F, organic F in soil. Thus, at 0.4%-0.6% Al2(SO4)3 levels, equivalent to the F∶Al quality ration of 6∶1- 4∶3, the F concentration in each plant part was relatively lower, which indicated that its defluoridation efficiency was better. At the same time, the contents of water soluble F, exchangeable F were lower and the contents of Fe/Mn binding F, organic F were higher which reduced F infiltration to groundwater and lower the F intake by people and animals eating cooked rice and drinking groundwater.
LIU Jinhua, ZHAO Lanpo* , WANG Hongbin, ZHANG Zhidan, ZHANG Zhongqing
. Effect of Al2(SO4)3 Application on Fluorine Forms in Paddy Soil and Fluorine Absorption by Rice Plants[J]. Chinese Journal OF Rice Science, 2012
, 26(4)
: 445
-450
.
DOI: 10.3969/j.issn.10017216.2012.04.009
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