Fertilizer research

, Volume 39, Issue 1, pp 39–42 | Cite as

Slow release rate: Individual granules and population behaviour

  • Malka Kochba
  • Ofira Ayalon
  • Yoram Avnimelech
Article

Abstract

Individual granules within a given granule population of a slow-release fertilizer (SRF) have a different release pattern. The populations studied differed both in relation to the time delay before the start of the release process and to the duration of the release. An association between a short delay period and a rapid release was found.

The random reease distribution can be approximated using first-order rate equations. In cases, a term describing a “lag” period should be added.

The distribution of release timing among the fertilizer granules may allow a long-lasting nutrient supply to the plant, as long as there are enough granules within the root zone to allow a uniform supply pattern.

Key words

Controlled release fertilizers kinetics mechanism nutrient supply rate of release slow release fertilizers (SRF) 

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References

  1. Ahmed IU, Attoe OJ, Engelbert LE and Corey RB (1963) Factors affecting the rate of release of fertilizers from capsules. Agron J 55: 495–499Google Scholar
  2. Kochba M, Gambash S and Avnimelech Y (1990) Studies on slow release fertilizers: 1. Effect of temperature, soil moisture and water vapor pressure. Soil Sci 149(6): 339–343Google Scholar
  3. Lunt OR and Oertli JJ (1962) Controlled release of fertilizer minerals by encapsulating membranes: II. Efficiency of recovery, influence of soil moisture, mode of application, and other considerations related to use. Soil Sci Soc Am Proc 26: 584–587Google Scholar
  4. Oertli JJ and Lunt OR (1962) Controlled release of fertilizer minerals by encapsulating membranes: I. Factors influencing the rate of release. Soil Sci Soc Am Proc 26: 579–583Google Scholar

Copyright information

© Kluwer Academic Publishers 1994

Authors and Affiliations

  • Malka Kochba
    • 1
  • Ofira Ayalon
    • 1
  • Yoram Avnimelech
    • 1
  1. 1.The Laboratory for Management of Environmental SystemsTechnion - Israel Institutre of TechnologyHaifaIsrael

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