Biology and Fertility of Soils

, Volume 17, Issue 1, pp 64–68 | Cite as

Effect of organic manure on organic phosphorus fractions in two paddy soils

  • Y. S. Zhang
  • W. Werner
  • H. W. Scherer
  • X. Sun
Original Paper

Abstract

We investigated the transformation of the organic P fractions from organic manure in two paddy soils (Ultisol, Entisol) and the influence of organic manure or cellulose on organic P under anaerobic conditions. The results obtained from the P fractionation experiment indicated that during the incubation labile and moderately labile organic P fractions increased in the Ultisol and decreased in the Entisol, which might be related to the difference in the organic matter content of both soils. Immediately after the application of organic manure, a large part of labile and moderately labile organic P supplied with the manure was transformed into moderately resistant organic P, possibly Ca- or Mg-inositol P were transformed into Fe-inositol P. During anaerobic incubation, the labile forms of organic P in the soils treated with organic manure were increased along with the incubation period in the first 4 weeks. The change in the moderately labile fraction was dramatic. It increased sharply in the first 2 weeks, then decreased, which was more pronounced in the soils treated with pig faeces. The moderately resistant fraction decreased during the whole incubation period. This indicated that under anaerobic conditions, the moderately resistant fraction can be transformed into labile and moderately labile organic P fractions, perhaps as Fe3+-inositol P is reduced to Fe+2-inositol P. Cellulose as an organic substrate had an increasing effect on organic P, especially when it was combined with inorganic P. Therefore, it is suggested that the application of inorganic P fertilizer combined with organic manure may be an effective way of protecting inorganic P against intensive sorption in soils.

Key words

Paddy soils Anaerobic conditions Organic P fractions Organic manure Cellulose 

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Copyright information

© Springer-Verlag 1994

Authors and Affiliations

  • Y. S. Zhang
    • 1
  • W. Werner
    • 2
  • H. W. Scherer
    • 2
  • X. Sun
    • 1
  1. 1.Department of Soil Science and AgrochemistryZhejiang Agricultural UniversityHangzhouP. R. China
  2. 2.Agrikulturchemisches Institut der Rheinischen Friedrich-Wilhelms-Universität BonnBonnGermany

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