Slow release rate: Individual granules and population behaviour

Malka Kochba, Ofira Ayalon, Yoram Avnimelech

Research output: Contribution to journalArticlepeer-review


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.

Original languageEnglish
Pages (from-to)39-42
Number of pages4
JournalFertilizer Research
Issue number1
StatePublished - Jan 1994
Externally publishedYes


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

ASJC Scopus subject areas

  • Agronomy and Crop Science
  • General Environmental Science
  • Soil Science
  • General Earth and Planetary Sciences


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