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Journal of Polymers and the Environment

, Volume 14, Issue 3, pp 223–230 | Cite as

Release Characteristics of Nutrients from Polymer-coated Compound Controlled Release Fertilizers

  • Chang-wen Du
  • Jian-ming Zhou
  • Avi Shaviv
Original Paper

Abstract

Reliable information regarding release characteristics of nutrients from a polymer-coated controlled release fertilizer (CRF) is essential for beneficial agronomic and environmental results. Significant knowledge regarding nitrogen release from polymer-coated urea was gained while the information regarding the release of the different nutrients contained in polymer-coated compound N–P–K CRF remains limited. An experiment in which major factors affecting the differential release of nutrients from two coated compound CRF was performed in free water, water saturated sand and sand at field capacity. In general, nitrate release was the fastest, followed by ammonium and potassium whereas phosphate was significantly slower, with a rate of linear release in free water 45–70% slower than that of nitrate. Little differences were obtained for the lag periods of nitrate, ammonium and potassium release (2–10 days) under the experimental conditions, whereas for P they were one order of magnitude larger. The main factor slowing the release was assumed to be the lower solubility of ions with P being the least soluble. Release into free water was, expectedly, somewhat faster than that into saturated sand and significantly faster as compared to sand at field capacity and particularly so for P. Raising the temperature from 20 °C to 40 °C increased the rate of linear release of the different nutrients. The energy of activation, EArel, estimated for the linear release, of the different nutrients, was narrow ranging between 37 to 46 (KJ mol−1) whereas the mean values obtained for the two CRF, differing by 50% in coating thickness, was non-significant. However, EArel was significantly different in different media. The complex effect of temperature on the lag period and nutrient interactions during release deserve further investigation.

Keywords

Polymer Controlled release Nutrients Medium Model 

Notes

Acknowledgments

We are thankful to the financial support by National Natural Science Foundation (No. 30400273) and National Basic Research Program of China (No. 2005CB121102).

References

  1. 1.
    Shaviv A (1999) Proc Int Fertiliser Soc 431:1Google Scholar
  2. 2.
    Shaviv A (2001) Proc Int Fertiliser Soc 469:1Google Scholar
  3. 3.
    Peoples MB, Freney JR, Moiser AR (1995) Nitrogen fertilization in the environment. Marcel Dekeker Inc, New YorkGoogle Scholar
  4. 4.
    Shaviv A (2000) Adv Agron 71:1CrossRefGoogle Scholar
  5. 5.
    Shaviv A, Raban S, Zaidel E (2003a) Envir Sci Tech 37:2251CrossRefGoogle Scholar
  6. 6.
    Shaviv A, Raban S, Zaidel E (2003b) Envir Sci Tech 37:2257CrossRefGoogle Scholar
  7. 7.
    Lu SM, Lee SF (1992) J Control Release 18:171CrossRefGoogle Scholar
  8. 8.
    Du C, Zhou J, Shaviv A (2004) Biosyst Eng 88:395CrossRefGoogle Scholar
  9. 9.
    Wilson FN, Chem C (1988) Proc Int Fertiliser Soc 268:1Google Scholar
  10. 10.
    Shoji S, Gandeza AT (1992) Controled release fertilizers with polyolefin resin coating. Konno Printing Co, Sendai, JapanGoogle Scholar
  11. 11.
    Huett DO, Gogel BJ (2000) Commun Soil Sci Plant Anal 31:959Google Scholar
  12. 12.
    Engelsjord ME, Fostad O, Singh BR (1997) Nutr Cycl Agroecosyst 46:179CrossRefGoogle Scholar
  13. 13.
    Smith GL, Robbins JA, Wallick WL (1998) Kinetics of controlled release fertilizers. American Chemical Society, Washington, DCGoogle Scholar
  14. 14.
    Tzika M, Alexandridou S, Kiparissides C (2003) Powder Technol 132:16CrossRefGoogle Scholar
  15. 15.
    Gandeza AT, Shoji S, Yamada I (1991) Soil Sci Soc Am J 55:1462CrossRefGoogle Scholar
  16. 16.
    Jarrell WM, Boersma L (1980) Soil Sci Soc Am J 44:418CrossRefGoogle Scholar
  17. 17.
    Du C, Zhou J, Shaviv A (2005) J Plant Nutrit Fertilizer Sci 2:179Google Scholar
  18. 18.
    Shoji S, Gandeza AT, Kimura K (1991) Soil Sci Soc Am J 55:1468CrossRefGoogle Scholar
  19. 19.
    Raban S (1994) Release mechanisms of membrane coated fertilisers. M.Sc. Thesis, Agric. Engn. Technion-IIT. Haifa, IsraelGoogle Scholar

Copyright information

© Springer Science+Business Media, Inc. 2006

Authors and Affiliations

  1. 1.State Key Laboratory of Soil and Sustainable Agriculture, Institute of Soil ScienceChinese Academy of SciencesNanjingChina
  2. 2.Faculty of Civil and Environment EngineeringIsrael Institute of TechnologyHaifaIsrael

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