Dazomet 98% GR vs Calcium Cyanamide 50% GR (Lime Nitrogen): A Comparative Guide for Nematode Control and Soil pH Managem
September 29, 2026
Dazomet 98% GR vs Calcium Cyanamide 50% GR (Lime Nitrogen): A Comparative Guide for Nematode Control and Soil pH Management
Release Date: September 2026 For Agro Distributors & Growers
Introduction
Continuous cropping in greenhouses and high-value crop fields frequently triggers severe root-knot nematode outbreaks, soil-borne diseases and soil acidification, which greatly reduce crop yield and quality. Soil disinfection is one of the most effective pre-plant solutions. Two widely adopted granular soil treatment products, Dazomet 98% GR and Calcium Cyanamide 50% GR (Lime Nitrogen), deliver distinct performance in nematode suppression and soil pH regulation. This article compares their field characteristics to help growers select the proper solution for their farm conditions.
Dazomet 98% GR: Powerful Fumigation for Heavy Nematode Pressure
Dazomet 98% GR is a broad-spectrum soil fumigant with no fertilizing function. Once incorporated into moist soil, it decomposes and releases methyl isothiocyanate (MITC), a volatile fumigant gas that penetrates soil pores thoroughly.
In terms of nematode control, Dazomet achieves strong, full-spectrum knockdown of root-knot nematodes, together with soil fungi, bacteria and weed seeds. It is the preferred option for heavily degraded old greenhouses with severe nematode infestation, bacterial wilt and root rot problems, ideal for strawberry, tomato, tobacco, flower and ginseng plantations.
When it comes to soil pH, Dazomet is nearly neutral and will not alter soil acidity or alkalinity after application. This feature makes it safe for both acidic and neutral soils. It does not adjust soil pH, so growers still need separate soil amendment measures if they face acidification issues.
Important note: Dazomet kills most beneficial soil microbes alongside pathogens. Bio-inoculants must be re-applied after full aeration before transplanting. Complete soil venting is mandatory to avoid phytotoxicity to seedlings.
Calcium Cyanamide 50% GR (Lime Nitrogen): Dual Function: Moderate Nematode Control + Acid Soil Amendment
Calcium Cyanamide 50% GR is a multi-functional granular product combining soil disinfection, slow-release nitrogen & calcium fertilization and soil conditioning. When soil moisture is sufficient, it hydrolyses to produce cyanamide, which suppresses nematodes and soil-borne pathogens.
For nematode management, it provides moderate suppression against root-knot nematodes. It works well in fields with mild to moderate continuous cropping pressure, but its efficacy is limited when used alone under heavy nematode outbreaks. It also inhibits weed seeds and certain soil fungi.
Its standout advantage lies in soil pH regulation. As a strongly alkaline material, lime nitrogen effectively neutralizes acidic soil, raises soil pH and alleviates soil acidification caused by long-term chemical fertilizer application. It also supplies calcium and slow-release nitrogen to crops, prevents calcium-deficiency physiological disorders, and accelerates straw and organic manure decomposition. It is NOT recommended for naturally alkaline soils.
Important note: A sufficient waiting period is required after application to eliminate residual cyanamide and prevent root burn. Do not mix it with acidic pesticides or acidic fertilizers. Operators must avoid alcohol intake 24 hours before and after handling.
Core Comparison Summary
| Item | Dazomet 98% GR | Calcium Cyanamide 50% GR (Lime Nitrogen) |
|---|---|---|
| Nematode Performance | High biocidal activity; ideal for heavy nematode infestation | Moderate suppression; suitable for mild-moderate nematode pressure |
| Soil pH Effect | Neutral, no change to soil pH | Strongly alkaline; ameliorates acidic soil; avoid use on alkaline soil |
| Additional Benefits | Broad-spectrum fumigation against fungi, bacteria and weed seeds | Supplies N & Ca, accelerates straw decomposition, nitrification inhibition |
| Best Fit | Old greenhouses with severe nematode & soil disease problems | Acidified soil, straw return fields, mild continuous cropping barriers |
Conclusion
For growers facing severe nematode outbreaks and heavy soil-borne disease pressure without soil pH adjustment needs, Dazomet 98% GR is the reliable choice for powerful soil fumigation. For farms suffering from soil acidification, mild-to-moderate nematode pressure, and demand for soil improvement plus nutrient supplementation, Calcium Cyanamide 50% GR (Lime Nitrogen) offers an integrated solution combining disinfection, soil amendment and fertilization.
Proper product selection based on actual nematode density and soil pH test results maximizes treatment value and protects crop health for the coming growing season.
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