Effect of Nitrogen Sources on Some Physiological Characteristics of Azolla

  • You Chong-biao
  • Li Jing-wei
  • Song Wei
  • Wei Wen-xiong
Conference paper


The exterior nitrogen sources seem to have a notable effect on azolla(1,2). At a high concentration, they will inhibit the growth of azolla and nitrogenase activity(2,3). Of these exterior nitrogen sources, Co(NH2)2 Produces the most serious effect, NH4 + — N somewhat less, and NO3 --N the least or no effect al all(4). However, during the cultivation of azolla it is imperative to apply adequate amount of nitrogen fertilizer in order to bring about early budding(l), and as often as not, the ammoniacal nitrogen predominates in the case of paddy soil. This paper aims to look into the effects of various nitrogen sources on growth and nitrogen fixation of azolla, and find out the relationship between Azolla imbricata grown in paddy soil and nitrogen nutritional conditions and effect of various nitrogen sources on growth and nitrogen fixation of azolla, with special emphasis on the function of nitrate nitrogen.


Nitrogen Source Nitrogen Fixation Free Amino Acid Paddy Soil Ammonium Nitrate 
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Copyright information

© Science Press, Beijing and Springer-Verlag Berlin Heidelberg 1981

Authors and Affiliations

  • You Chong-biao
    • 1
  • Li Jing-wei
    • 1
  • Song Wei
    • 1
  • Wei Wen-xiong
    • 2
  1. 1.Institute of Application of Atomic Energy in AgricultureChinese Academy of Agricultural SciencesBeijingChina
  2. 2.Soil and Fertilizer Research InstituteFujian Academy of Agricultural SciencesFuzhouChina

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