What Is 34-0-0 Nitrogen Fertilizer (Ammonium Nitrate)
34-0-0 is a fertilizer grade that contains 34% nitrogen by weight and no guaranteed phosphate or potash. When the product is ammonium nitrate, its chemical formula is NH₄NO₃, with about half its nitrogen in nitrate form and half in ammonium form. Use it only when a soil test, crop or turf need, and product label support it.
Nitrogen can help plants grow, but more is not always better. Excess nitrogen may move into waterways or groundwater, and the wrong application rate can harm plants or waste product. Understanding the label helps you use only what is needed. I explain the grade, its risks, and the basic steps for safe, even application below.
What 34-0-0 Nitrogen Fertilizer Means
The three numbers on a fertilizer label show the guaranteed percentages, by weight, of nitrogen, phosphate, and potash. In 34-0-0, the first number means 34% total nitrogen. The zeros mean the product guarantees no phosphate or potash, not that every granule is free of all other substances.
The numbers are called the fertilizer grade. A 50-pound bag labeled 34-0-0 contains 17 pounds of nitrogen, because 50 × 0.34 = 17. The remaining weight is other material in the product; check its label for details.
What ammonium nitrate is
Ammonium nitrate is a nitrogen fertilizer with the chemical formula NH₄NO₃. In a 34-0-0 product made from ammonium nitrate, about half of its nitrogen is nitrate nitrogen and half is ammoniacal, or ammonium, nitrogen. That works out to roughly 17% of the product’s weight in each form.
These forms behave differently in soil. Nitrate is already in a form plants can take up, but it can move with water through soil. Ammonium can be taken up by plants or changed by soil microbes into nitrate. Soil, weather, and crop conditions affect what happens next.
Check the product label rather than relying on the grade alone. Not every product labeled 34-0-0 must be ammonium nitrate. The label’s guaranteed analysis and ingredient information identify what you are buying.
Why the Nitrogen Forms and Grade Matter
The two forms of nitrogen help explain how ammonium nitrate supplies plant nutrients, but they do not set the right application rate. That rate depends on the site, plant need, and product directions. A soil test or crop or turf recommendation helps prevent both underfeeding and excess nitrogen.
A fertilizer grade tells you how much nutrient is in the product, not how much your lawn or crop needs. For example, applying more 34-0-0 to solve a problem without checking the cause may add nitrogen when the actual issue is something else.
| Label detail | What it tells you | What it does not tell you |
|---|---|---|
| 34-0-0 | 34% total nitrogen by product weight | The right rate for your site |
| First number, 34 | Nitrogen content | Whether your plants need nitrogen |
| Two zeros | No guaranteed phosphate or potash | That the product contains no other ingredients |
| Ammonium nitrate, NH₄NO₃ | The fertilizer’s chemical identity | How it will perform under every soil or weather condition |
Choosing a product for the site
Use ammonium nitrate only if it suits the crop or turf recommendation and is permitted for that use. Compare the full label, not only the three-number grade. If a soil test calls for nutrients besides nitrogen, a 34-0-0 product does not supply a guaranteed amount of those nutrients.
For sustainability, match the amount and timing to the plant’s need. Keep fertilizer out of drains and waterways, and avoid applying ahead of conditions that could carry it away. Follow local rules and label directions, which may set additional limits.
Equipment Setup and Safety Preparation
Use a fertilizer spreader or other applicator approved by the product label, not chainsaw or outdoor power equipment. Before applying, confirm the intended site and rate, read the label and safety data sheet (SDS), and prepare to keep people, pets, and product away from water and drains.
Ammonium nitrate is an oxidizer. That means it can intensify a fire. Heat, confinement, contamination, or contact with incompatible materials can create a severe explosion risk, so safe handling is essential from the start.
Before opening the container:
- Read the label and SDS, including directions for protective gear, spills, and storage.
- Confirm the recommended nitrogen rate using a soil test or crop or turf guidance.
- Check that the product is intended for the site and use.
- Keep people and animals clear of the application area.
- Protect wells, drains, and waterways from granules and runoff.
- Keep the product away from heat, flames, fuels, oils, organic materials, and reducing agents.
Keep granules dry and avoid creating dust or spills. Do not mix the fertilizer with other chemicals. Never use a confined or improvised storage area. If product becomes heated or contaminated, do not try to handle a bulk quantity. Move away and contact emergency services.
Field Application and Rate Control
Application rate means the amount of fertilizer spread over a measured area. Set it from the required nitrogen amount, the product’s 34% nitrogen content, and the label’s directions. Apply evenly with a suitable, calibrated applicator; do not treat a calculation as a recommendation for a particular lawn or crop.
To calculate product amount, divide the target nitrogen amount by 0.34:
Product required = target nitrogen ÷ 0.34
For example, 1 pound of actual nitrogen requires about 2.94 pounds of 34-0-0 product. This is a conversion, not a suggested rate. Your soil test, crop or turf recommendation, and product label must establish the target nitrogen amount and application area.
For an area measured in acres, keep the units consistent. If a recommendation calls for a certain number of pounds of nitrogen per acre, the calculation gives pounds of product per acre. Do not apply an acreage rate to a smaller area without converting the area correctly.
During application:
- Follow the label’s rate, timing, and method.
- Distribute granules uniformly and avoid overlapping passes.
- Avoid wind drift and application to wet foliage unless the label permits it.
- Water in the fertilizer only when the label or agronomic recommendation directs you to do so.
- Stop if you cannot control the spreader or keep product away from drains and water.
Application examples, not universal rates
These examples show how the grade affects a decision. They are not reports of specific farms or lawns, and they do not set a rate.
| Situation | What to check | Practical choice |
|---|---|---|
| A soil test supports adding nitrogen | Recommended nitrogen amount, area, product label | Calculate the 34-0-0 product amount, then calibrate the spreader |
| A test shows a need for nutrients beyond nitrogen | Nutrient recommendation and product analysis | Choose a product that meets the full recommendation; 34-0-0 alone does not guarantee phosphate or potash |
| No soil test or crop guidance is available | Site needs and local recommendations | Get guidance before applying rather than guessing a rate |
Spreader Cleaning and Calibration
Calibration means checking how much product an applicator releases over a known area. It helps you apply the calculated amount instead of guessing from a spreader dial. Use the spreader maker’s procedure and weigh the product; settings can vary by model and product.
First, measure a test area and weigh the amount of fertilizer to use. Follow the manufacturer’s calibration steps, then check how much product remains after covering that area. Adjust and repeat as needed. Do not assume a setting from another spreader, fertilizer, or job will give the same rate.
Use a clean, dry, label-approved applicator. Keep granules dry, control dust, and avoid spills while loading. After application, clean and dry the spreader according to its maker’s instructions and the product SDS. Handle leftover granules or wash water as the label and local rules direct, not by rinsing them into a drain or waterway.
Safe Storage and Seasonal Handling
Store ammonium nitrate in its original, labeled container and in a location approved for the product and local rules. Keep it dry and away from heat, flames, fuels, oils, organic materials, reducing agents, and confined spaces. Follow the SDS for storage, transport, and spill response.
Do not transfer it to an unlabeled container or store it with incompatible materials. Secure it so children and animals cannot reach it. Check local requirements, since rules for storing, transporting, or reporting ammonium nitrate can vary by location and amount.
If a fire, heat, or contamination involves ammonium nitrate, the situation can escalate rapidly. Do not try to handle heated or contaminated bulk product. Withdraw to a safe place and contact emergency services. For a spill, follow the SDS and label rather than improvising a cleanup method.
Key Takeaways and FAQs
The safest approach is to identify the product, confirm that nitrogen is needed, calculate from a supported target, and follow the label and SDS. Calibrated application helps reduce waste, while careful storage and spill prevention protect people, property, and water.
What does 34-0-0 mean?
It means the product contains 34% total nitrogen by weight and guarantees no phosphate or potash. The numbers do not set an application rate.
Is every 34-0-0 fertilizer ammonium nitrate?
No. The grade describes nutrient content, not the chemical source. Check the label to confirm whether the product is ammonium nitrate.
How much nitrogen is in a 50-pound bag?
A 50-pound bag of 34-0-0 contains 17 pounds of nitrogen: 50 multiplied by 0.34.
How much 34-0-0 supplies 1 pound of nitrogen?
About 2.94 pounds of product supplies 1 pound of nitrogen. This is a conversion only, not a recommended application rate.
Does 34-0-0 contain phosphorus or potassium?
It guarantees no phosphate or potash. If a soil test calls for either nutrient, check whether another product is needed.
Can I use a spreader setting from another fertilizer?
Not as a reliable rate. Spreader settings vary with the equipment and product. Calibrate using the manufacturer’s procedure over a measured area.
Can ammonium nitrate wash into water?
Nitrate can move with water through soil. Apply only as directed, avoid runoff, and protect drains, wells, and waterways.
Is ammonium nitrate a fire hazard?
It is an oxidizer and can intensify fire. Heat, confinement, contamination, or incompatible materials can create severe explosion risk. Follow the SDS and storage rules.
Can I mix it with another fertilizer or chemical?
Do not mix it with other chemicals. Follow the product label and SDS for any approved use or handling directions.
What should I do if it gets hot or contaminated?
Do not handle a heated or contaminated bulk quantity. Move away and contact emergency services.
Should I water it in after spreading?
Only when the product label or agronomic recommendation directs you to do so. Do not guess; follow the instructions for the product and site.
(This article was written by one of our staff writers, Evan Bradley. Visit our Meet the Team page.)
