Abstract: Using the 39 years long term fertilization experiment,the soil in the year of 1978,1984,1990,1996,2002,2008 and 2014 were studied. The effect of different fertilization on the soil clay mineral in the soil was studied by X ray diffraction. The changes of relative contents of clay minerals in different fertilization treatments were analyzed,and the results showed that the relative contents of clay minerals could be changed by long-term fertilization. Relative content of the interannual variability of the montmorillonite was higher than that of CK,assumes the trend of escalation,the results most significant (R²=0.991 80),followed by M₂(R²=0.952 86),with the time delay,kaolinite and the relative content of M₂N₁ decreased most significantly (R²=0.993 10),then M₂N₂(R²=0.938 89),results M₁N₂(R²=0.900 00),and kaolinite content of all treatments were lower than CK. Soil relative content of chlorite,organic fertilizer and nitrogen fertilizer treatment compared with CK decreased,according to 2014 showed that,M₂N₂ decreased the most obvious and 5 percentage points. Single application of N fertilizer treatment hydromica relative content was declined with the passage of time,and N₂(R²=0.948 03) less than N₁(R²=0.883 27),single application of organic fertilizer and organic fertilizer application of nitrogen fertilizer in mica relative content increased year by year,M₂N₂ highest (R²=0.971 26) followed by the results (R²=0.903 18),M₂N₁(R²=0.890 89) that organic fertilizer was conducive to the formation of mica. Long-term single application of nitrogen fertilizer caused by lack of potassium,hydromica mineral layer of non exchangeable potassium continue to release,montmorillonite hydromica the formation of mixed layer relative content also with the passage of time showed a rising trend.

Key words: Long term located fertilization, Fluvo aquic soil, Clayminerals

CLC Number: 

• S143