Translations:Controlled-release fertilizer/9/en: Difference between revisions

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Message definition (Controlled-release fertilizer)
==Definitions==
The Association of American Plant Food Control Officials (AAPFCO) has published the following general definitions (Official Publication 57):
* '''Slow- or controlled-release fertilizer''': A fertilizer containing a plant nutrient in a form which delays its availability for plant uptake and use after application, or which extends its availability to the plant significantly longer than a reference ‘rapidly available nutrient fertilizer’ such as ammonium nitrate or urea, ammonium phosphate or potassium chloride. Such delay of initial availability or extended time of continued availability may occur by a variety of mechanisms. These include controlled water solubility of the material by semi-permeable coatings, occlusion, protein materials, or other chemical forms, by slow hydrolysis of water-soluble low molecular weight compounds, or by other unknown means.
* '''Stabilized nitrogen fertilizer''': A fertilizer to which a nitrogen stabilizer has been added. A nitrogen stabilizer is a substance added to a fertilizer which extends the time the nitrogen component of the fertilizer remains in the soil in the urea-N or ammoniacal-N form.
* '''[[Nitrification]] inhibitor''': A substance that inhibits the biological oxidation of ammoniacal-N to nitrate-N. 
* '''[[Urease]] inhibitor''': A substance that inhibits hydrolytic action on urea by the enzyme urease.

Definitions

The Association of American Plant Food Control Officials (AAPFCO) has published the following general definitions (Official Publication 57):

  • Slow- or controlled-release fertilizer: A fertilizer containing a plant nutrient in a form which delays its availability for plant uptake and use after application, or which extends its availability to the plant significantly longer than a reference ‘rapidly available nutrient fertilizer’ such as ammonium nitrate or urea, ammonium phosphate or potassium chloride. Such delay of initial availability or extended time of continued availability may occur by a variety of mechanisms. These include controlled water solubility of the material by semi-permeable coatings, occlusion, protein materials, or other chemical forms, by slow hydrolysis of water-soluble low molecular weight compounds, or by other unknown means.
  • Stabilized nitrogen fertilizer: A fertilizer to which a nitrogen stabilizer has been added. A nitrogen stabilizer is a substance added to a fertilizer which extends the time the nitrogen component of the fertilizer remains in the soil in the urea-N or ammoniacal-N form.
  • Nitrification inhibitor: A substance that inhibits the biological oxidation of ammoniacal-N to nitrate-N.
  • Urease inhibitor: A substance that inhibits hydrolytic action on urea by the enzyme urease.
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