Premium slow-release nitrogen fertilizer combining urea and formaldehyde for controlled, season-long feeding. This 100% non-burning formula delivers 39% nitrogen through microbial release, keeping trees, vegetables, lawns, and ornamentals vibrant for 8–12 weeks per application.
One of the highest nitrogen concentrations available in a slow-release form, delivering sustained nutrition over 8–12 weeks per application.
Safe for all plants including newly planted seedlings, sensitive ornamentals, and container plants — even at higher application rates and during hot weather.
Nitrogen is released by soil microorganisms, matching nutrient availability to plant uptake rates for efficient feeding with minimal waste.
Polymer-coated urea combined with formaldehyde creates a controlled-release matrix that resists leaching and reduces environmental runoff.
Each application lasts 8–12 weeks, reducing the number of applications needed compared to quick-release nitrogen fertilizers.
Consistent nitrogen supply supports robust vegetative growth, vibrant green foliage, and stronger root development throughout the growing season.
Dust-free, uniformly sized granules blend easily with other fertilizers and spread evenly through broadcast or hand application.
Effective for lawns, vegetable gardens, fruit trees, ornamental beds, container plants, and commercial field crops across all soil types.
Controlled-release technology keeps nitrogen in the root zone longer, reducing groundwater contamination and improving nutrient use efficiency.
Independently lab tested for heavy metal content. CDFA registered and manufactured in California under strict quality standards.
Nitroform 39-0-0 is manufactured through a controlled condensation process that combines urea and formaldehyde to produce a stable, slow-release nitrogen polymer.
Nitroform delivers 39% nitrogen in a controlled-release form — one of the highest slow-release nitrogen concentrations on the market. The urea-formaldehyde polymer breaks down gradually through soil microbial activity, providing steady nutrition without salt buildup or osmotic stress to plant roots.
The 39% nitrogen drives vegetative growth, chlorophyll production, and protein synthesis. The slow-release mechanism ensures plants receive consistent nitrogen over 8–12 weeks rather than a single flush that causes surge growth and burn risk.
Nitroform is a pure nitrogen source with no phosphorus. For complete nutrition, pair with MKP 0-52-34 or MAP 12-61-0 to supply phosphorus for root development and flowering.
No potassium is included. Supplement with MKP 0-52-34 or Potassium Sulfate 0-0-53 for stress resistance and fruit quality.
Unlike quick-release urea that dumps nitrogen in 1–2 weeks, Nitroform's polymer structure meters out nitrogen over 8–12 weeks, matching natural plant uptake patterns.
The polymer coating prevents salt concentration spikes in the root zone. Quick-release fertilizers can create osmotic stress that damages roots — Nitroform eliminates this risk entirely.
Controlled release reduces nitrogen leaching into groundwater and volatilization losses to the atmosphere, keeping more of each application where plants can use it.
Results vary with soil temperature, moisture, and microbial activity. Expect faster release in warm, moist soils and slower release in cool or dry conditions.
Nitroform 39-0-0 is designed for soil application. Spread evenly and water thoroughly after application to activate the slow-release coating.
| Grass Type | Rate per 1,000 sq ft | Rate per Acre |
|---|---|---|
| Cool-Season Grasses | 3 lbs | 130 lbs |
| Mixed / Average | 4 lbs | 175 lbs |
| Warm-Season Grasses | 5 lbs | 220 lbs |
| Application Method | Rate | Notes |
|---|---|---|
| Per Plant (side dress) | 1–2 tablespoons | Light feeders: 1 tbsp; Heavy feeders: 2 tbsp |
| Per 1,000 sq ft | 4–6 lbs | Broadcast or band application |
| Per Acre | 175–260 lbs | Field vegetable production |
| Tree Size | Rate per Tree | Notes |
|---|---|---|
| Young / Dwarf | ½ cup (0.25 lbs) | Apply around drip line |
| Medium | ¾ cup (0.375 lbs) | Spread evenly under canopy |
| Large / Mature | 1 cup (0.5 lbs) | Broadcast under full canopy |
| Application Type | Rate per 1,000 sq ft | Rate per Acre |
|---|---|---|
| Garden Beds | 4–6 lbs | 175–260 lbs |
| Ornamentals | 3–4 lbs | 130–175 lbs |
| Crop Type | Rate per Acre |
|---|---|
| Turf / Pasture | 130 lbs |
| Row Crops | 175 lbs |
| Vegetables | 220 lbs |
| Heavy Feeders | 260 lbs |
Apply when soil temperature is above 55°F for optimal microbial activity. Reapply every 8–12 weeks during the growing season. Best results in early spring and mid-summer. Water thoroughly after each application.
Nitroform is a pure nitrogen source (39-0-0), so it pairs perfectly with phosphorus and potassium fertilizers for balanced feeding. Mix 50% Nitroform with 25% MAP 12-61-0 and 25% MKP 0-52-34 for a well-rounded lawn or garden blend that provides slow-release nitrogen plus immediate phosphorus and potassium.
Refer to the Safety Data Sheet (SDS) for complete safety information.
Nitroform provides pure slow-release nitrogen. Build a complete fertilization program by pairing it with these complementary products for phosphorus, potassium, and quick-release nitrogen when needed.
High-phosphorus water-soluble fertilizer for root development, flowering, and fruit set. Ideal complement to Nitroform's nitrogen-only profile.
Delivers both phosphorus and potassium in one water-soluble product. Strengthens stress tolerance, improves fruit quality, and supports overall plant vigor.
Quick-release nitrogen for rapid green-up. Use alongside Nitroform when plants need an immediate nitrogen boost before the slow-release kicks in.
Quick-release nitrogen plus 24% sulfur. Lowers soil pH for acid-loving plants and provides rapid nitrogen response between Nitroform applications.
Nitroform's non-burning properties come from its urea-formaldehyde polymer structure. Unlike quick-release fertilizers that dissolve immediately and spike salt concentration in the soil, Nitroform releases nitrogen gradually through microbial decomposition. This keeps the osmotic potential around roots low, preventing the salt stress that causes fertilizer burn. The result is safe application on seedlings, sensitive ornamentals, container plants, and even during hot weather.
Each application provides nitrogen for 8–12 weeks. The release rate depends on soil temperature, moisture, and microbial activity. Warmer, moist soils with active microbial populations release nitrogen faster (8–10 weeks), while cool or dry conditions slow the process (10–12 weeks). Optimal release occurs at soil pH 6.0–7.0. Plan reapplications based on these conditions and visible plant response.
Apply when soil temperatures are above 55°F for optimal microbial activation. For cool-season lawns, early spring (April) and early fall (September) are ideal. Warm-season grasses respond best to late spring (May) and mid-summer (July) applications. For vegetables, apply at planting and side dress 3–4 weeks later. Fruit trees benefit from early spring application as buds swell and an optional post-bloom feeding.
Yes — Nitroform's uniform, dust-free particles blend well with phosphorus sources (MAP, MKP), potassium sources (potassium sulfate, MKP), micronutrient blends, and organic fertilizers. A popular all-purpose blend is 50% Nitroform, 25% phosphorus source, and 25% potassium source. Mix thoroughly before application and use within 30 days. Store blends in dry conditions.
Absolutely. Nitroform's non-burning formula is especially valuable in containers where salt buildup is a common problem. Apply 1–2 tablespoons per pot depending on size, sprinkle on the soil surface or mix into the top inch of potting mix, and water thoroughly. The slow-release action means container plants receive consistent nutrition without the frequent feeding quick-release fertilizers require.
Quick-release fertilizers like urea or ammonium sulfate deliver nitrogen immediately but last only 1–3 weeks, require more frequent applications, and carry a higher burn risk. Nitroform's controlled release provides 8–12 weeks of feeding, reduces application frequency, eliminates burn risk, and minimizes nitrogen loss through leaching and volatilization. The trade-off is a slower initial response — which is why some programs combine both types.
When applied as directed and watered in, Nitroform poses minimal risk. The granules are designed to stay in the soil and break down gradually. However, as with all fertilizers, keep children and pets off treated areas until the product has been watered in and the surface is dry. Store the product in its sealed container out of reach of children and animals.
Every Nitroform product is backed by Greenway Biotech's commitment to quality, transparency, and customer satisfaction.
Not satisfied? We offer a 90-day money-back guarantee. Return the unused portion in its original packaging for a full refund — no hassle, no questions.
1% of all profits go to our foundation, focused on improving educational opportunities for children.
Related articles coming soon. Check back for guides on slow-release nitrogen, lawn fertilization programs, and custom fertilizer blending.
Check out our full FAQ page or contact our experts for personalized advice.
Couldn't load pickup availability
