01
Ammonium goes in
Urea or ammonium fertilizer first exists as ammonium, which is positively charged and held by soil particles.
HT-DMPP stabilized nitrogen
Stabilized Nitrogen Program: Less Loss, No Overgrowth
Once nitrogen fertilizer is in the soil, microbes convert ammonium to nitrate. Nitrate is not held by soil particles, so heavy rain or irrigation can wash it away, and a large early flush of nitrogen makes crops grow soft and leggy. This program uses the HT-DMPP nitrification inhibitor to slow that conversion, keeping nitrogen in the root zone longer and supplying it more evenly, combined with stage-based rates — less loss, no overgrowth.
- ActionSlower nitrification
- CropsLeafy greens, fruit-tree flush
- FieldsWet or sloping
- ProductHetisu H.T.
The Challenge
Four common nitrogen problems
Nitrogen drives leaf and shoot growth — and is the easiest nutrient to waste.
One heavy rain and the nitrogen is gone
HT-DMPP slows the conversion of ammonium to easily leached nitrate, so nitrogen stays in the root zone longer.
Fast early growth, soft leaves, lodging later
A steadier supply avoids an early flush; the season total still follows recommended rates.
Sloping or sandy fields do not hold fertilizer
Suited to wet, sloping or sandy fields where nitrogen is easily lost.
Worried about overuse and nitrate in groundwater
Work out the season total first and stay within it; stabilized nitrogen manages timing, not quantity.
How It Works
Why nitrogen is lost — and what DMPP does
DMPP (3,4-dimethylpyrazole phosphate) is a widely studied nitrification inhibitor. It temporarily suppresses the step that turns ammonium into nitrate, so more nitrogen stays as ammonium; how long it lasts depends on soil temperature and moisture.
02
Microbes nitrify it
Nitrifying bacteria convert ammonium to nitrate, which is negatively charged, not held by soil and easily leached.
03
HT-DMPP slows the step
The inhibitor temporarily slows nitrification, keeping nitrogen as ammonium for longer and smoothing supply.
04
Match crop uptake
Split applications by growth stage and a capped season total align supply with when the crop needs it.
The Program
Product
Hetisu H.T. (NPK 30-10-10) is the product labelled with HT-DMPP nitrification inhibition. Follow the label rate and count it within the season’s nitrogen total.
Where It Fits
Where it fits
- Crops
- Leafy vegetables and fruit trees in rapid growth (per the Hetisu H.T. label)
- Fields
- Wet, sloping or sandy fields where nitrogen is easily lost
- Not suited
- DMPP acts on the ammonium-to-nitrate step, so nitrate-based fertilizers are unaffected; when a crop is visibly short of nitrogen and needs it now, use a quick-acting source first.
- Rates
- Keep the season total within Taiwan’s Crop Fertilization Manual recommendations; stabilized nitrogen manages timing, not quantity.
- Formula
- Hetisu H.T.: NPK 30-10-10 with HT-DMPP nitrification inhibition and chelated micronutrients
- References
- Zerulla, W. et al.: 3,4-Dimethylpyrazole phosphate (DMPP) – a new nitrification inhibitor for agriculture and horticulture. Biology and Fertility of Soils 34: 79–84, 2001.Agriculture and Food Agency (MOA): Crop Fertilization Manual, 2024 edition.
FAQ
FAQ
DMPP (3,4-dimethylpyrazole phosphate) is a nitrification inhibitor. It temporarily slows the conversion of ammonium to nitrate in soil, so nitrogen stays as ammonium longer and is less easily lost.
Ordinary ammonium fertilizer turns into nitrate fairly quickly and can wash out in rain; stabilized nitrogen adds an inhibitor that slows the conversion for a steadier supply.
It helps reduce loss, but rates should still start from recommendations and be adjusted to leaf colour and growth; do not cut rates sharply on your own.
Wet, sloping or sandy fields where nitrogen is easily lost, and leafy crops that tend to overgrow early.
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