Scientia Agricultura Sinica ›› 2013, Vol. 46 ›› Issue (16): 3392-3400.doi: 10.3864/j.issn.0578-1752.2013.16.010

• SOIL & FERTILIZER·WATER-SAVING IRRIGATION·AGROECOLOGY & ENVIRONMENT • Previous Articles     Next Articles

Characteristics of Mineralization and Nitrification in Neutral Purple Paddy Soil from a Long-Term Fertilization Experiment

 QIN  Zi-Xian-12, ZHANG  Yu-Ting-12, ZHOU  Zhi-Feng-12, SHI  Xiao-Jun-12, GUO  Tao-12   

  1. 1.College of Resources and Environment, Southwest University, Chongqing 400716
    2.The National Monitoring Base for Purple Soil Fertility and Fertilizer Efficiency, Chongqing 400716
  • Received:2013-01-14 Online:2013-08-15 Published:2013-06-18

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Abstract: 【Objective】The objective of the experiment is to reveal the effects of long-term fertilization on nitrogen internal cycle of neutral purple paddy soil ecosystem and the ways maintaining soil nitrogen supplying potentials. 【Method】 A long-term fertilization experiment lasted for 21 years was carried out in Beibei District, Chongqing City. Waterlogging incubation method proposed by Warning was used to investigate N mineralization characteristics. The total number of soil nitrobacteria, the potential nitrification rate and the intensity of soil nitrification were studied.【Result】Nitrogen accumulations and nitrogen mineralization potential (N0) were significantly improved under the chemical fertilizer (except N) or organic fertilizer or combined application of organic manure and inorganic NPK, and combined application of organic manure and inorganic NPK was the highest (164.43 mg•kg-1), nitrogen mineralization potential (N0) improved by 59.29%, as compared to CK. But the increasing extent of combined chloride-containing fertilizer and organic manure was much lower than the fertilization of organic manure and inorganic NPK. Different fertilization in all treatments (except NPK or M) increased the rate of mineralization (k). Compared to CK, the total number of soil nitrobacteria was significantly improved under fertilizers N, especially organic manure and inorganic NPK fertilizer combined application, which was about 74.25 times of CK. The potential nitrification rate and the intensity of soil nitrification showed a consistent trend, which applied the organic manure and inorganic NPK fertilizer had the best effect, and combined chloride-containing fertilizer and organic fertilizer was significantly lower than CK. Soil pH affected significantly the potential nitrification rate and the intensity of soil nitrification, with a correlation coefficient of r =0.925 (P<0.01) and r =0.773 (P<0.05). 【Conclusion】 Long-term combined application of organic manure and inorganic NPK is considered the best way for maintaining the soil fertility, chloride-containing fertilizer inhibits nitrification process and it can be used as nitrification inhibitor.

Key words: long-term fertilization , nitrogen , mineralization , nitrification , chloride-containing fertilizer , paddy soil

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